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Episodic tremor and slip (ETS) is a seismological phenomenon observed in some subduction zones. These events are characterized by non-earthquake seismic rumbling, or tremor, and slow slip along the plate interface. Slow slip events are distinguished from earthquakes by their propagation speed and focus. In slow slip events, there is an apparent reversal of crustal motion, although the fault motion remains consistent with the direction of subduction. ETS events themselves are imperceptible to human beings and do not cause damage.^[1]

Discovery

Nonvolcanic, episodic tremor was first identified in southwest Japan in 2002.^[2] Shortly after, the Geological Survey of Canada coined the term "episodic tremor and slip" to characterize observations of GPS measurements in the Vancouver Island area.^[3] Vancouver Island lies in the eastern, North American region of the Cascadia subduction zone. ETS events in Cascadia were observed to reoccur cyclically with a period of approximately 14 months.^[4] Analysis of measurements led to the successful prediction of ETS events in following years (e.g., 2003, 2004, 2005, and 2007). In Cascadia, these events are marked by about two weeks of 1 to 10 Hz seismic trembling and non-earthquake ("aseismic") slip on the plate boundary equivalent to a magnitude 7 earthquake. (Tremor is a weak seismological signal only detectable by very sensitive seismometers.) Recent episodes of tremor and slip in the Cascadia region have occurred down-dip of the region ruptured in the 1700 Cascadia earthquake.

Since the initial discovery of this seismic mode in the Cascadia region, slow slip and tremor have been detected in other subduction zones around the world, including Japan and Mexico.^[5] Slow slip is not accompanied by tremor in the Hikurangi Subduction Zone.^[6]

Every five years a year-long quake of this type occurs beneath the New Zealand capital, Wellington. It was first measured in 2003, and has reappeared in 2008 and 2013.^[7]

Characteristics

Slip behaviour

In the Cascadia subduction zone, the Juan de Fuca Plate, a relic of the ancient Farallon Plate, is actively subducting eastward underneath the North American Plate. The boundary between the Juan de Fuca and North American plates is generally "locked" due to interplate friction. A GPS marker on the surface of the North American plate above the locked region will trend eastward as it is dragged by the subduction process. Geodetic measurements show periodic reversals in the motion (i.e., westward movement) of the overthrusting North American Plate.^[4] During these reversals, the GPS marker will be displaced to the west over a period of days to weeks. Because these events occur over a much longer duration than earthquakes, they are termed "slow slip events".

Slow slip events have been observed to occur in the Cascadia, Japan, and Mexico subduction zones.^[5] Unique characteristics of slow slip events include periodicity on timescales of months to years, focus near or down-dip of the locked zone, and along-strike propagation of 5 to 15 km/d.^[5] In contrast, a typical earthquake rupture velocity is 70 to 90% of the S-wave velocity, or approximately 3.5 km/s.

Because slow slip events occur in subduction zones, their relationship to megathrust earthquakes is of economic, human, and scientific importance. The seismic hazard posed by ETS events is dependent on their focus. If the slow slip event extends into the seismogenic zone, accumulated stress would be released, decreasing the risk of a catastrophic earthquake.^[8]^[9] However, if the slow slip event occurs down-dip of the seismogenic zone, it may "load" the region with stress.^[8]^[10] The probability of a great earthquake (moment magnitude $M_{w}\geq 8.0$ ) occurring has been suggested to be 30 times greater during an ETS event than otherwise,^[11] but more recent observations have shown this theory to be simplistic.^[12] One factor is that tremor occurs in many segments at different times along the a plate boundary; another factor is that rarely have tremor and large earthquakes been observed to correlate in timing .^[13]

Tremor

Slow slip events are frequently linked to non-volcanic seismological "rumbling", or tremor. Tremor is distinguished from earthquakes in several key respects: frequency, duration, and origin. Seismic waves generated by earthquakes are high-frequency and short-lived. These characteristics allow seismologists to determine the hypocentre of an earthquake using first-arrival methods. In contrast, tremor signals are weak and extended in duration.^[14] Furthermore, while earthquakes are caused by the rupture of faults, tremor is generally attributed to underground movement of fluids (magmatic or hydrothermal).^[15] As well as in subduction zones, tremor has been detected in transform faults such as the San Andreas.^[16]

In both the Cascadia and Nankai subduction zones, slow slip events are directly associated with tremor.^[4]^[17] In the Cascadia subduction zone, slip events and seismological tremor signals are temporally coincident,^[4] but this relationship does not extend to the Mexican subduction zone.^[18] Furthermore, this association is not an intrinsic characteristic of slow slip events. In the Hikurangi Subduction Zone, New Zealand, episodic slip events are associated with distinct, reverse-faulted microearthquakes.^[6]

Two types of tremor have been identified: one associated with geodetic deformation (as described above), and one associated with 5 to 10 second bursts excited by distant earthquakes. The second type of tremor has been detected worldwide; for example, it has been triggered in the San Andreas Fault by the 2002 Denali earthquake and in Taiwan by the 2001 Kunlun earthquake.^[19]^[20]

Geological interpretation

Tremor is commonly associated with the underground movement of magmatic or hydrothermal fluids.^[15] As a plate is subducted into the mantle, it loses water from its porespace and due to phase changes of hydrous minerals (such as amphibole). It has been proposed that this liberation of water generates a supercritical fluid at the plate interface, lubricating plate motion.^[21] This supercritical fluid may open fractures in the surrounding rock, and that tremor is the seismological signal of this process.^[21] Mathematical modelling has successfully reproduced the periodicity of episodic tremor and slip in the Cascadia region by incorporating this dehydration effect.^[22] In this interpretation, tremor may be enhanced where the subducting oceanic crust is young, hot, and wet as opposed to older and colder.

However, alternative models have also been proposed. Tremor has been demonstrated to be influenced by tides or variable fluid flow through a fixed volume.^[8]^[23] Tremor has also been attributed to shear slip at the plate interface.^[4]

References

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External links

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↑ Template:Cite web
↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
↑ Template:Cite web
↑ ^4.0 ^4.1 ^4.2 ^4.3 ^4.4 Rogers, G., and H. Dragert (2003), "Episodic tremor and slip on the Cascadia subduction zone: the chatter of silent slip", Science, 300 (5627), 1942, doi:10.1126/science.1084783.
↑ ^5.0 ^5.1 ^5.2 Liu, Y., and J. Rice (2009), Slow slip predictions based on granite and gabbro friction data compared to GPS measurements in Northern Cascadia, Journal of Geophysical Research, 114, B09,407, doi:10.1029/2008JB006142.
↑ ^6.0 ^6.1 Delahaye, E., J. Townend, M. Reyners, and G. Rogers (2009), "Microseismicity but no tremor accompanying slow slip in the Hikurangi subduction zone, New Zealand", Earth and Planetary Science Letters, 277 (1-2), 21–28, doi:10.1016/j.epsl.2008.09.038.
↑ Template:Cite news
↑ ^8.0 ^8.1 ^8.2 Rubinstein, J., Shelly, D., Ellsworth, W. (2010), "Non-volcanic Tremor: A Window into the Roots of Fault Zones", in New Frontiers in Integrated Solid Earth Sciences, edited by S. Cloetingh and J. Negendank, pp. 287--314, Springer Science+Business Media B.V., doi:10.1007/978-90-481-2737-5_8.
↑ Kostoglodov, V., S. Singh, J. Santiago, S. Franco, K. Larson, A. Lowry, and R. Bilham (2003), "A large silent earthquake in the Guerrero seismic gap, Mexico", Geophysical Research Letters, 30 (15), 1807, doi:10.1029/2003GL017219.
↑ Brudzinski, M., Cabral-Cano, E., Correa-Mora, F., Demets, C., Márquez-Azúa, B. (2007), "Slow slip transients along the Oaxaca subduction segment from 1993 to 2007", Geophysical Journal International, 171 (2), 523--538, doi:10.1111/j.1365-246X.2007.03542.x.
↑ Mazzoti, S. and J. Adams (2004), "Variability of near-term probability for the next great earthquake on the Cascadia subduction zone", Bulletin of the Seismological Society of America, 94, 1954--1959, doi:10.1785/012004032.
↑ Beroza, G. C. and S. Ide (2011), "Non-Volcanic Tremor and Slow Earthquakes", Annu. Rev. Earth Planet. Sci., 39, 271-296.
↑ Brudzinski, M. and Allen, R. (2007), "Segmentation in episodic tremor and slip all along Cascadia", Geology, 35 (10), 905--910, doi:10.1130/G23740A.1.
↑ Shelly, D., Berozal, G. and Ide, S (2007), "Non-volcanic tremor and low-frequency earthquake swarms", Nature, 446, 305-307, doi:10.1038/nature05666.
↑ ^15.0 ^15.1 Schwartz, S., and J. Rokosky (2007), "Slow slip events and seismic tremor at circum-Pacific subduction zones", Reviews of Geophysics, 45 (3), doi:10.1029/2006RG000208.
↑ Nadeau, R. and Dolenc, D. (2004), "Nonvolcanic Tremors Deep Beneath the San Andreas Fault", Science, 307 (5708), doi:10.1126/science.1107142.
↑ Obara, K., H. Hirose, F. Yamamizu, and K. Kasahara (2004), "Episodic slow slip events accompanied by non-volcanic tremors in southwest Japan subduction zone", Geophysical Research Letters, 31 (23), L23,602, doi:10.1029/2004GL020848.
↑ Payero, J., V. Kostoglodov, N. Shapiro, T. Mikumo, A. Iglesias, X. Pérez-Campos, and R. Clayton (2008), "Nonvolcanic tremor observed in the Mexican subduction zone", Geophysical Research Letters, 35 (7), doi:10.1029/2007GL032877
↑ Peng, Z., Vidale, J., Creager, K., Rubinstein, J., Gomberg, J., and Bodin, P. (2008), "Strong tremor near Parkfield, CA, excited by the 2002 Denali Fault earthquake", Geophysical Research Letters, 35, L23305,5, doi:10.1029/2008GL036080.
↑ Peng, Z., Chao, K. (2008), "Non-volcanic tremor beneath the Central Range in Taiwan triggered by the 2001 $M_{w}$ 7.8 Kunlun earthquake", Geophysical Journal International 175 (2), doi:10.1111/j.1365-246X.2008.03886.x.
↑ ^21.0 ^21.1 Obara, K. (2002), "Nonvolcanic deep tremor associated with subduction in southwest Japan", Science, 296 (5573), 1679, doi:10.1126/science.1070378.
↑ Liu, Y., and J. Rice (2007), "Spontaneous and triggered aseismic deformation transients in a subduction fault model", Journal of Geophysical Research, 112 (10.1029) doi:10.1029/2007JB004930.
↑ Watanabe, T., Y. Hiramatsu, and K. Obara (2007), "Scaling relationship between the duration and the amplitude of non-volcanic deep low-frequency tremors", Geophysical Research Letters, 34 (7) doi:10.1029/2007GL029391.

[1] Template:Cite web

[2] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[3] Template:Cite web

[Rogers2003-4] 4.0 ^4.1 ^4.2 ^4.3 ^4.4 Rogers, G., and H. Dragert (2003), "Episodic tremor and slip on the Cascadia subduction zone: the chatter of silent slip", Science, 300 (5627), 1942, doi:10.1126/science.1084783.

[Liu2009-5] 5.0 ^5.1 ^5.2 Liu, Y., and J. Rice (2009), Slow slip predictions based on granite and gabbro friction data compared to GPS measurements in Northern Cascadia, Journal of Geophysical Research, 114, B09,407, doi:10.1029/2008JB006142.

[Delahaye2009-6] 6.0 ^6.1 Delahaye, E., J. Townend, M. Reyners, and G. Rogers (2009), "Microseismicity but no tremor accompanying slow slip in the Hikurangi subduction zone, New Zealand", Earth and Planetary Science Letters, 277 (1-2), 21–28, doi:10.1016/j.epsl.2008.09.038.

[7] Template:Cite news

[Rubinstein2010-8] 8.0 ^8.1 ^8.2 Rubinstein, J., Shelly, D., Ellsworth, W. (2010), "Non-volcanic Tremor: A Window into the Roots of Fault Zones", in New Frontiers in Integrated Solid Earth Sciences, edited by S. Cloetingh and J. Negendank, pp. 287--314, Springer Science+Business Media B.V., doi:10.1007/978-90-481-2737-5_8.

[Kostoglodov2003-9] Kostoglodov, V., S. Singh, J. Santiago, S. Franco, K. Larson, A. Lowry, and R. Bilham (2003), "A large silent earthquake in the Guerrero seismic gap, Mexico", Geophysical Research Letters, 30 (15), 1807, doi:10.1029/2003GL017219.

[Brudzinski2007a-10] Brudzinski, M., Cabral-Cano, E., Correa-Mora, F., Demets, C., Márquez-Azúa, B. (2007), "Slow slip transients along the Oaxaca subduction segment from 1993 to 2007", Geophysical Journal International, 171 (2), 523--538, doi:10.1111/j.1365-246X.2007.03542.x.

[Mazotti2004-11] Mazzoti, S. and J. Adams (2004), "Variability of near-term probability for the next great earthquake on the Cascadia subduction zone", Bulletin of the Seismological Society of America, 94, 1954--1959, doi:10.1785/012004032.

[Beroza2011-12] Beroza, G. C. and S. Ide (2011), "Non-Volcanic Tremor and Slow Earthquakes", Annu. Rev. Earth Planet. Sci., 39, 271-296.

[Brudzinski2007b-13] Brudzinski, M. and Allen, R. (2007), "Segmentation in episodic tremor and slip all along Cascadia", Geology, 35 (10), 905--910, doi:10.1130/G23740A.1.

[Shelly2007-14] Shelly, D., Berozal, G. and Ide, S (2007), "Non-volcanic tremor and low-frequency earthquake swarms", Nature, 446, 305-307, doi:10.1038/nature05666.

[Schwartz2007-15] 15.0 ^15.1 Schwartz, S., and J. Rokosky (2007), "Slow slip events and seismic tremor at circum-Pacific subduction zones", Reviews of Geophysics, 45 (3), doi:10.1029/2006RG000208.

[Nadeau2004-16] Nadeau, R. and Dolenc, D. (2004), "Nonvolcanic Tremors Deep Beneath the San Andreas Fault", Science, 307 (5708), doi:10.1126/science.1107142.

[Obara2004-17] Obara, K., H. Hirose, F. Yamamizu, and K. Kasahara (2004), "Episodic slow slip events accompanied by non-volcanic tremors in southwest Japan subduction zone", Geophysical Research Letters, 31 (23), L23,602, doi:10.1029/2004GL020848.

[Payero2008-18] Payero, J., V. Kostoglodov, N. Shapiro, T. Mikumo, A. Iglesias, X. Pérez-Campos, and R. Clayton (2008), "Nonvolcanic tremor observed in the Mexican subduction zone", Geophysical Research Letters, 35 (7), doi:10.1029/2007GL032877

[Peng2008a-19] Peng, Z., Vidale, J., Creager, K., Rubinstein, J., Gomberg, J., and Bodin, P. (2008), "Strong tremor near Parkfield, CA, excited by the 2002 Denali Fault earthquake", Geophysical Research Letters, 35, L23305,5, doi:10.1029/2008GL036080.

[Peng2008b-20] Peng, Z., Chao, K. (2008), "Non-volcanic tremor beneath the Central Range in Taiwan triggered by the 2001 $M_{w}$ 7.8 Kunlun earthquake", Geophysical Journal International 175 (2), doi:10.1111/j.1365-246X.2008.03886.x.

[Obara2002-21] 21.0 ^21.1 Obara, K. (2002), "Nonvolcanic deep tremor associated with subduction in southwest Japan", Science, 296 (5573), 1679, doi:10.1126/science.1070378.

[Liu2007-22] Liu, Y., and J. Rice (2007), "Spontaneous and triggered aseismic deformation transients in a subduction fault model", Journal of Geophysical Research, 112 (10.1029) doi:10.1029/2007JB004930.

[Watanabe2007-23] Watanabe, T., Y. Hiramatsu, and K. Obara (2007), "Scaling relationship between the duration and the amplitude of non-volcanic deep low-frequency tremors", Geophysical Research Letters, 34 (7) doi:10.1029/2007GL029391.

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+'''Episodic tremor and slip (ETS)''' is a [[seismology|seismological]] phenomenon observed in some [[subduction|subduction zones]]. These events are characterized by non-[[earthquake]] seismic rumbling, or tremor, and [[slow earthquake|slow slip]] along the plate interface.  Slow slip events are distinguished from earthquakes by their propagation speed and [[hypocenter|focus]]. In slow slip events, there is an apparent reversal of crustal motion, although the fault motion remains consistent with the direction of subduction. ETS events themselves are imperceptible to human beings and do not cause damage.<ref>{{cite web|title=Episodic Tremor and Slip beneath Vancouver Island|url=http://earthquakescanada.nrcan.gc.ca/pprs-pprp/re/ETS-eng.php|publisher=Natural Resources Canada|accessdate=17 June 2011}}</ref>
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+==Discovery==
+[[Image:Cascadia earthquake sources.png|thumb|upright=1.75|Structure of the Cascadia subduction zone. The Juan de Fuca Plate is subducting northeastward under the North American Plate.]]
+Nonvolcanic, episodic tremor was first identified in southwest Japan in 2002.<ref>{{cite journal |last1=Obara |first1=Kazushige |last2= |first2= |year=2002 |title=Nonvolcanic Deep Tremor Associated with Subduction in Southwest Japan |journal=Science |volume=296 |issue= |pages=1679–1681 |publisher= |doi= |url= |accessdate=1 June 2013}}</ref>  Shortly after, the [[Geological Survey of Canada]] coined the term "episodic tremor and slip" to characterize observations of [[Global Positioning Satellite|GPS]] measurements in the [[Vancouver Island]] area.<ref>{{cite web|title=Geodynamics – Episodic Tremor and Slip (ETS)|url=http://gsc.nrcan.gc.ca/geodyn/ets_e.php|publisher=Natural Resources Canada – Geological Survey of Canada|accessdate=17 June 2011}}
+</ref> Vancouver Island lies in the eastern, North American region of the [[Cascadia subduction zone]]. ETS events in Cascadia were observed to reoccur cyclically with a period of approximately 14 months.<ref name="Rogers2003">Rogers, G., and H. Dragert (2003), "Episodic tremor and slip on the Cascadia subduction zone: the chatter of silent slip", ''Science'', ''300'' (5627), 1942, [http://dx.doi.org/10.1126/science.1084783 doi:10.1126/science.1084783].
+</ref> Analysis of measurements led to the successful prediction of ETS events in following years (e.g., 2003, 2004, 2005, and 2007).  In Cascadia, these events are marked by about two weeks of 1 to 10&nbsp;Hz seismic trembling and non-earthquake ("aseismic") slip on the plate boundary equivalent to a [[moment magnitude|magnitude]] 7 earthquake. (Tremor is a weak seismological signal only detectable by very sensitive seismometers.) Recent episodes of tremor and slip in the Cascadia region have occurred [[strike and dip|down-dip]] of the region ruptured in the [[1700 Cascadia earthquake]].
+Since the initial discovery of this seismic mode in the Cascadia region, slow slip and tremor have been detected in other subduction zones around the world, including Japan and Mexico.<ref name="Liu2009">Liu, Y., and J. Rice (2009), Slow slip predictions based on granite and gabbro friction data compared to GPS measurements in Northern Cascadia, ''Journal of Geophysical Research'', ''114'', B09,407, [http://dx.doi.org/10.1029/2008JB006142 doi:10.1029/2008JB006142].</ref>
+Slow slip is not accompanied by tremor in the [[Hikurangi Trench|Hikurangi Subduction Zone]].<ref name="Delahaye2009">Delahaye, E., J. Townend, M. Reyners, and G. Rogers (2009), "Microseismicity but no tremor accompanying slow slip in the Hikurangi subduction zone, New Zealand", ''Earth and Planetary Science Letters'', ''277'' (1-2), 21–28, [http://dx.doi.org/10.1016/j.epsl.2008.09.038 doi:10.1016/j.epsl.2008.09.038].
+</ref>
+Every five years a year-long quake of this type occurs beneath the New Zealand capital, Wellington. It was first measured in 2003, and has reappeared in 2008 and 2013.<ref>{{cite news| url= http://www.3news.co.nz/Silent-quake-gently-rocks-Wellington/tabid/1160/articleID/299393/Default.aspx|work=3 News NZ |title= 'Silent' quake gently rocks Wellington| date=May 28, 2013}}</ref>
+==Characteristics==
+===Slip  behaviour===
+[[File:Displacement of Albert Head GPS Station, Victoria, British Columbia, 2005-2012.svg|thumb|upright=2|right|GPS measurements from [[Victoria, British Columbia]] show periodic reversals in crustal deformation in the North American region of the Cascadia Subduction Zone.]]
+In the Cascadia subduction zone, the [[Juan de Fuca Plate]], a relic of the ancient [[Farallon Plate]], is actively subducting eastward underneath the [[North American Plate]]. The boundary between the Juan de Fuca and North American plates is generally "locked" due to interplate friction.  A GPS marker on the surface of the North American plate above the locked region will trend eastward as it is dragged by the subduction process. [[Geodesy|Geodetic]] measurements show periodic reversals in the motion (i.e., westward movement) of the overthrusting North American Plate.<ref name="Rogers2003" /> During these reversals, the GPS marker will be displaced to the west over a period of days to weeks. Because these events occur over a much longer duration than earthquakes, they are termed "slow slip events".
+Slow slip events have been observed to occur in the Cascadia, Japan, and Mexico subduction zones.<ref name="Liu2009" /> Unique characteristics of slow slip events include periodicity on timescales of months to years, [[hypocentre|focus]] near or [[Strike and dip|down-dip]] of the locked zone, and [[Strike and dip|along-strike]] propagation of 5 to 15&nbsp;km/d.<ref name="Liu2009" /> In contrast, a typical earthquake rupture velocity is 70 to 90% of the [[S-wave]] velocity, or approximately 3.5&nbsp;km/s.
+Because slow slip events occur in subduction zones, their relationship to [[megathrust]] earthquakes is of economic, human, and scientific importance. The seismic hazard posed by ETS events is dependent on their focus. If the slow slip event extends into the [[Shear_zone#General_introduction|seismogenic zone]], accumulated stress would be released, decreasing the risk of a catastrophic earthquake.<ref name="Rubinstein2010">Rubinstein, J., Shelly, D., Ellsworth, W. (2010), "Non-volcanic Tremor: A Window into the Roots of Fault Zones", in ''New Frontiers in Integrated Solid Earth Sciences'', edited by S. Cloetingh and J. Negendank, pp. 287--314, Springer Science+Business Media B.V., [http://dx.doi.org/10.1007/978-90-481-2737-5_8 doi:10.1007/978-90-481-2737-5_8].</ref><ref name="Kostoglodov2003">Kostoglodov, V., S. Singh, J. Santiago, S. Franco, K. Larson, A. Lowry, and R. Bilham (2003), "A large silent earthquake in the Guerrero seismic gap, Mexico", ''Geophysical Research Letters'', ''30'' (15), 1807, [http://dx.doi.org/10.1029/2003GL017219  doi:10.1029/2003GL017219].</ref> However, if the slow slip event occurs down-dip of the seismogenic zone, it may "load" the region with stress.<ref name="Rubinstein2010" /><ref name="Brudzinski2007a">Brudzinski, M., Cabral-Cano, E., Correa-Mora, F., Demets, C., Márquez-Azúa, B. (2007), "Slow slip transients along the Oaxaca subduction segment from 1993 to 2007", ''Geophysical Journal International'', ''171'' (2), 523--538, [http://dx.doi.org/10.1111/j.1365-246X.2007.03542.x doi:10.1111/j.1365-246X.2007.03542.x].</ref> The probability of a great earthquake ([[moment magnitude]] <math>M_w \geq 8.0</math>) occurring has been suggested to be 30 times greater during an ETS event than otherwise,<ref name="Mazotti2004">Mazzoti, S. and J. Adams (2004), "Variability of near-term probability for the next great earthquake on the Cascadia subduction zone", ''Bulletin of the Seismological Society of America'', ''94'', 1954--1959, [http://dx.doi.org/10.1785/012004032 doi:10.1785/012004032].</ref> but more recent observations have shown this theory to be simplistic.<ref name="Beroza2011">Beroza, G. C. and S. Ide (2011), "Non-Volcanic Tremor and Slow Earthquakes", ''Annu. Rev. Earth Planet. Sci.'', ''39'', 271-296.</ref>  One factor is that tremor occurs in many segments at different times along the a plate boundary; another factor is that rarely have tremor and large earthquakes been observed to correlate in timing .<ref name="Brudzinski2007b">Brudzinski, M. and Allen, R. (2007), "Segmentation in episodic tremor and slip all along Cascadia", ''Geology'', ''35'' (10), 905--910, [http://dx.doi.org/10.1130/G23740A.1 doi:10.1130/G23740A.1].</ref>
+===Tremor===
+Slow slip events are frequently linked to non-volcanic seismological "rumbling", or tremor. Tremor is distinguished from earthquakes in several key respects: frequency, duration, and origin. [[Seismic wave]]s generated by earthquakes are high-frequency and short-lived. These characteristics allow seismologists to determine the [[hypocentre]] of an earthquake using [[Seismic_wave#Usefulness_of_P_and_S_waves_in_locating_an_event|first-arrival methods]]. In contrast, tremor signals are weak and extended in duration.<ref name="Shelly2007">Shelly, D., Berozal, G. and Ide, S (2007), "Non-volcanic tremor and low-frequency earthquake swarms", ''Nature'', ''446'', 305-307, [http://dx.doi.org/10.1038/nature05666 doi:10.1038/nature05666].</ref> Furthermore, while earthquakes are caused by the rupture of [[Fault (geology)|faults]], tremor is generally attributed to underground movement of fluids (magmatic or hydrothermal).<ref name="Schwartz2007">Schwartz, S., and J. Rokosky (2007), "Slow slip events and seismic tremor at circum-Pacific subduction zones", ''Reviews of Geophysics'', ''45'' (3), [http://dx.doi.org/10.1029/2006RG000208 doi:10.1029/2006RG000208].</ref> As well as in subduction zones, tremor has been detected in transform faults such as the [[San Andreas Fault|San Andreas]].<ref name="Nadeau2004">Nadeau, R. and Dolenc, D. (2004), "Nonvolcanic Tremors Deep Beneath the San Andreas Fault", ''Science'', ''307'' (5708), [http://dx.doi.org/10.1126/science.1107142 doi:10.1126/science.1107142].</ref>
+In both the Cascadia and [[Nankai Trough|Nankai]] subduction zones, slow slip events are directly associated with tremor.<ref name="Rogers2003" /><ref name="Obara2004">Obara, K., H. Hirose, F. Yamamizu, and K. Kasahara (2004), "Episodic slow slip events accompanied by non-volcanic tremors in southwest Japan subduction zone", ''Geophysical Research Letters'', ''31'' (23), L23,602, [http://dx.doi.org/10.1029/2004GL020848 doi:10.1029/2004GL020848].</ref> In the Cascadia subduction zone, slip events and seismological tremor signals are temporally coincident,<ref name="Rogers2003" /> but this relationship does not extend to the Mexican subduction zone.<ref name="Payero2008">Payero, J., V. Kostoglodov, N. Shapiro, T. Mikumo, A. Iglesias, X. Pérez-Campos, and R. Clayton (2008), "Nonvolcanic tremor observed in the Mexican subduction zone", ''Geophysical Research Letters'', ''35'' (7), [http://dx.doi.org/10.1029/2007GL032877  doi:10.1029/2007GL032877]</ref> Furthermore, this association is not an intrinsic characteristic of slow slip events. In the [[Hikurangi Trough|Hikurangi Subduction Zone]], New Zealand, episodic slip events are associated with distinct, [[Fault (geology)#Dip-slip_faults|reverse-faulted]] microearthquakes.<ref name="Delahaye2009" />
+Two types of tremor have been identified: one associated with geodetic deformation (as described above), and one associated with 5 to 10 second bursts excited by distant earthquakes. The second type of tremor has been detected worldwide; for example, it has been triggered in the San Andreas Fault by the [[2002 Denali earthquake]] and in Taiwan by the [[2001 Kunlun earthquake]].<ref name="Peng2008a">Peng, Z., Vidale, J., Creager, K., Rubinstein, J., Gomberg, J., and Bodin, P. (2008), "Strong tremor near Parkfield, CA, excited by the 2002 Denali Fault earthquake", ''Geophysical Research Letters'', ''35'', L23305,5, [http://dx.doi.org/10.1029/2008GL036080 doi:10.1029/2008GL036080].</ref><ref name="Peng2008b">Peng, Z., Chao, K. (2008), "Non-volcanic tremor beneath the Central Range in Taiwan triggered by the 2001 <math>M_w</math> 7.8 Kunlun earthquake", ''Geophysical Journal International'' ''175'' (2), [http://dx.doi.org/10.1111/j.1365-246X.2008.03886.x doi:10.1111/j.1365-246X.2008.03886.x].</ref>
+==Geological interpretation==
+Tremor is commonly associated with the underground movement of magmatic or hydrothermal fluids.<ref name="Schwartz2007" /> As a plate is subducted into the mantle, it loses water from its [[Porosity|porespace]] and due to phase changes of hydrous minerals (such as [[amphibole]]). It has been proposed that this liberation of water generates a [[supercritical fluid]] at the plate interface, lubricating plate motion.<ref name="Obara2002">Obara, K. (2002), "Nonvolcanic deep tremor associated with subduction in southwest Japan", ''Science'', ''296'' (5573), 1679, [http://dx.doi.org/10.1126/science.1070378 doi:10.1126/science.1070378].</ref> This supercritical fluid may open fractures in the surrounding rock, and that tremor is the seismological signal of this process.<ref name="Obara2002" /> Mathematical modelling has successfully reproduced the periodicity of episodic tremor and slip in the Cascadia region by incorporating this dehydration effect.<ref name="Liu2007">Liu, Y., and J. Rice (2007), "Spontaneous and triggered aseismic deformation transients in a subduction fault model", ''Journal of Geophysical Research'', ''112'' (10.1029) [http://dx.doi.org/10.1029/2007JB004930 doi:10.1029/2007JB004930].</ref> In this interpretation, tremor may be enhanced where the subducting oceanic crust is young, hot, and wet as opposed to older and colder.
+However, alternative models have also been proposed. Tremor has been demonstrated to be influenced by tides or variable fluid flow through a fixed volume.<ref name="Rubinstein2010" /><ref name="Watanabe2007">Watanabe, T., Y. Hiramatsu, and K. Obara (2007), "Scaling relationship between the duration and the
+amplitude of non-volcanic deep low-frequency tremors", ''Geophysical Research Letters'', ''34'' (7) [http://dx.doi.org/10.1029/2007GL029391 doi:10.1029/2007GL029391].</ref> Tremor has also been attributed to shear slip at the plate interface.<ref name="Rogers2003" />
+==See also==
+* [[Geodynamics]]
+* [[Plate tectonics]]
+* [[Seismology]]
+* [[Slow earthquake]]
+==References==
+{{reflist}}
+==External links==
+* [http://www.nrcan-rncan.gc.ca/com/index-eng.php Natural Resources Canada]
+[[Category:Geophysics]]
+[[Category:Seismology and earthquake terminology]]