scholarly journals Seismic wave triggering of nonvolcanic tremor, episodic tremor and slip, and earthquakes on Vancouver Island

2009 ◽  
Vol 114 ◽  
Author(s):  
Justin L. Rubinstein ◽  
Joan Gomberg ◽  
John E. Vidale ◽  
Aaron G. Wech ◽  
Honn Kao ◽  
...  
Keyword(s):  
Seismic Wave ◽  
Vancouver Island ◽  
Episodic Tremor And Slip ◽  
Episodic Tremor

Great earthquakes on Canada’s west coast: a review This article is one of a series of papers published in this Special Issue on the theme Lithoprobe — parameters, processes, and the evolution of a continent. Geological Survey of Canada Contribution 20090196.

2010 ◽  
Vol 47 (5) ◽  
pp. 801-820 ◽  
Author(s):  
Roy D. Hyndman ◽  
Garry C. Rogers
Keyword(s):  
Elastic Strain ◽  
Coastal Region ◽  
Vancouver Island ◽  
Cascadia Subduction Zone ◽  
Slow Slip ◽  
Coastal Cities ◽  
Great Earthquakes ◽  
Multidisciplinary Data ◽  
Episodic Tremor And Slip ◽  
Episodic Tremor

The first Lithoprobe transect in 1984 across Vancouver Island had primary objectives to define the structure associated with subduction and constraints on the potential for great thrust earthquakes. The Lithoprobe results and the comprehensive multidisciplinary data collection and analyses that followed provide compelling evidence for past great earthquakes along the Cascadia subduction zone from Vancouver Island to northernmost California, and for present elastic strain build up toward future great events. There is evidence of sudden coastal subsidence up to 2 m and of deep-sea turbidite deposits indicating strong shaking from huge earthquakes at irregular intervals averaging about 500 years, the last in 1700. Precision geodetic measurements define the present buckling of the coastal region, diagnostic of elastic strain accumulation on a locked thrust fault. The landward extent of rupture and, therefore, shaking at coastal cities is constrained by (i) the pattern of elastic strain buildup, (ii) the estimated temperatures on the fault, (iii) the updip limit of episodic tremor and slip (ETS), (iv) the downdip change in reflection character of the thrust, and (v) the magnitude of coastal subsidence in the most recent, 1700, and previous great events. The major earthquakes are very large, M9, rupturing most of the Cascadia margin, but mainly offshore, limiting somewhat the shaking at inland cities but producing large tsunamis. The ETS that occurs at intervals of just over a year appears to involve slow slip on the subduction thrust downdip of the rupture zone that increases stress on the locked zone and may indicate time varying potential for great events.

scholarly journals Slab morphology in the Cascadia fore arc and its relation to episodic tremor and slip

2010 ◽  
Vol 115 ◽  
Author(s):  
Pascal Audet ◽  
Michael G. Bostock ◽  
Devin C. Boyarko ◽  
Michael R. Brudzinski ◽  
Richard M. Allen
Keyword(s):  
Episodic Tremor And Slip ◽  
Episodic Tremor

scholarly journals Detection of Deep Low-frequency Earthquakes in the Nankai Subduction Zoneover 11 Years Usingamatched Filter Technique

2020 ◽  
Author(s):  
Aitaro Kato ◽  
Shigeki Nakagawa
Keyword(s):  
Matched Filter ◽  
Low Frequency ◽  
Slow Slip ◽  
Slow Slip Events ◽  
Filter Technique ◽  
Strike Direction ◽  
Episodic Tremor And Slip ◽  
Spatio Temporal ◽  
Episodic Tremor

Abstract To improve our understanding of the long-term behavior of low-frequency earthquakes (LFEs) along the tremor belt of the Nankai subduction zone, we applied a matched filter technique to continuous seismic data recorded by a dense and highly sensitive seismic network over an 11year window, April 2004 to August 2015. We detected a total of ~510,000 LFEs, or ~23× the number of LFEs in the JMA catalog for the same period. During long-term slow slip events (SSEs) in the Bungo Channel, a series of migrating LFEbursts intermittently occurred along the fault-strike direction, with slow hypocenter propagation. Elastic energy released by long-term SSEs appears to control the extent of LFE activity. We identify slowlymigrating fronts of LFEs during major episodic tremor and slip (ETS)events, which extend over distances of up to 100 km and follow diffusion-like patterns of spatial evolution with a diffusion coefficient of ~104 m2/s. This migration pattern closely matches the spatio-temporal evolution of tectonictremors reported by previous studies. At shorter distances, up to 15 km, we discovered rapid diffusion-like migrationof LFEs with a coefficient of ~105 m2/s. We also recognize that rapid migration of LFEs occurred intermittently in many streaks during major ETS episodes. These observations suggest that slow slip transients contain a multitude of smaller, temporally clustered fault slip events whose evolution is controlled by a diffusional process.

DO SMALL FAULTS IN THE BARABOO SYNCLINE PRESERVE EVIDENCE OF EPISODIC TREMOR AND SLIP (ETS)?

2018 ◽  
Author(s):  
Allison D. Jones ◽  
◽  
Laurel B. Goodwin ◽  
Philip E. Brown
Keyword(s):  
Episodic Tremor And Slip ◽  
Episodic Tremor
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