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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.〔(【引用サイトリンク】url=http://earthquakescanada.nrcan.gc.ca/pprs-pprp/re/ETS-eng.php )〕 ==Discovery== Nonvolcanic, episodic tremor was first identified in southwest Japan in 2002. 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.〔(【引用サイトリンク】url=http://gsc.nrcan.gc.ca/geodyn/ets_e.php ) 〕 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.〔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 ). 〕 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.〔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 ).〕 Slow slip is not accompanied by tremor in the Hikurangi Subduction Zone.〔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 ). 〕 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Episodic tremor and slip」の詳細全文を読む スポンサード リンク
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