Change in seismic activity in the Tokai region related to weakening and strengthening of the interplate coupling

Yoshïda, Akio; Hososno, Kohji; Tsukakoshi, Toshimitsu; Kobayashi, Akio; Takayama, Hiromi; Wiemer, Stefan

doi:10.1016/j.tecto.2005.08.031

Cited by 8 publications

(7 citation statements)

References 17 publications

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“…Specifically, we note that slow-slip events in Hawaii (Segall et al, 2006;Brooks et al, 2006Brooks et al, , 2008Wolfe et al, 2007), New Zealand (Delahaye et al, 2009;Reyners and Bannister, 2007), Tokai (Yoshida et al, 2006), and Mexico do appear to have triggered earthquakes. While none of the triggered earthquakes were large enough to pose a hazard to people, the fact that events were triggered demonstrates that the stresses associated with the slow-slip events are large enough to influence earthquakes and therefore affect seismic hazard.…”

Section: Seismic Hazard Implicationsmentioning

confidence: 78%

Non-volcanic Tremor: A Window into the Roots of Fault Zones

Rubinstein

Shelly

Ellsworth

2009

New Frontiers in Integrated Solid Earth Sciences

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The recent discovery of non-volcanic tremor in Japan and the coincidence of tremor with slow-slip in Cascadia have made earth scientists reevaluate our models for the physical processes in subduction zones and on faults in general. Subduction zones have been studied very closely since the discovery of slow-slip and tremor. This has led to the discovery of a number of related phenomena including low frequency earthquakes and very low frequency earthquakes. All of these events fall into what some have called a new class of events that are governed under a different frictional regime than simple brittle failure. While this model is appealing to many, consensus as to exactly what process generates tremor has yet to be reached. Tremor and related events also provide a window into the deep roots of subduction zones, a poorly understood region that is largely devoid of seismicity. Given that such fundamental questions remain about non-volcanic tremor, slow-slip, and the region in which they occur, we expect that this will be a fruitful field for a long time to come.

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Section: Seismic Hazard Implicationsmentioning

confidence: 78%

Non-volcanic Tremor: A Window into the Roots of Fault Zones

Rubinstein

Shelly

Ellsworth

2009

New Frontiers in Integrated Solid Earth Sciences

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“…Specifically, we note that slow-slip events in Hawaii (Segall et al, 2006;Brooks et al, 2006Brooks et al, , 2008Wolfe et al, 2007), New Zealand (Delahaye et al, 2009;Reyners and Bannister, 2007), Tokai (Yoshida et al, 2006), and Mexico do appear to have triggered earthquakes. Specifically, we note that slow-slip events in Hawaii (Segall et al, 2006;Brooks et al, 2006Brooks et al, , 2008Wolfe et al, 2007), New Zealand (Delahaye et al, 2009;Reyners and Bannister, 2007), Tokai (Yoshida et al, 2006), and Mexico do appear to have triggered earthquakes.…”

Section: Seismic Hazard Implicationsmentioning

confidence: 78%

New Frontiers in Integrated Solid Earth Sciences

Cloetingh¹,

Negendank²

2010

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The book series is dedicated to the United Nations International Year of Planet Earth. The aim of the Year is to raise worldwide public and political awareness of the vast (but often under-used) potential of Earth sciences for improving the quality of life and safeguarding the planet. Geoscientific knowledge can save lives and protect property if threatened by natural disasters. Such knowledge is also needed to sustainably satisfy the growing need for Earth's resources by more people. Earths scientists are ready to contribute to a safer, healthier and more prosperous society. IYPE aims to develop a new generation of such experts to find new resources and to develop land more sustainably.

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“…Several authors have reported a relative quiescence in shallow (<50 km) seismicity prior to slip in Tokai [ Yamamoto et al , 2005; Matsumura , 2006], which could indicate some form of precursory behavior. During the slow slip event, Yoshida et al [2006] reported variations in slab and crustal seismicity concurrent with changes in slip velocity. The rate of slab earthquakes ( M jma > 1.1) increased in fall 2000 at the initiation of slow slip, decreased in fall 2001 during a period of decreased slip, and rose again in early 2003, coincident with an increase in slip.…”

Section: Slow Slip Events Seismicity and Triggeringmentioning

confidence: 99%

“…In early 2003 the rate of crustal earthquakes rose again, in concurrence with the increase in slab earthquakes and slow slip rate. Yoshida et al [2006] suggested that this pattern of crustal seismicity was related to changes in interplate coupling, with stress increasing during times of increased coupling. In contrast, they suggested that weakened coupling results in increased curvature of the slab as it subducts, which heightens seismicity in the slab.…”

Section: Slow Slip Events Seismicity and Triggeringmentioning

confidence: 99%

“…In the context of this relationship the increase in crustal seismicity with accelerated slip in early 2003 is surprising. Yoshida et al [2006] suggested that this change is related to an increase in shortening rate observed in the nearby Suruga Trough, which could increase compressive stress in the crust while promoting acceleration of slow slip deeper on the plate interface. Although this relationship remains preliminary, it is significant as the best documented correlation between seismicity and slow slip.…”

Section: Slow Slip Events Seismicity and Triggeringmentioning

confidence: 99%

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Slow slip events and seismic tremor at circum‐Pacific subduction zones

Schwartz

Rokosky

2007

Reviews of Geophysics

641

575

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It has been known for a long time that slip accompanying earthquakes accounts for only a fraction of plate tectonic displacements. However, only recently has a fuller spectrum of strain release processes, including normal, slow, and silent earthquakes (or slow slip events) and continuous and episodic slip, been observed and generated by numerical simulations of the earthquake cycle. Despite a profusion of observations and modeling studies the physical mechanism of slow slip events remains elusive. The concurrence of seismic tremor with slow slip episodes in Cascadia and southwestern Japan provides insight into the process of slow slip. A perceived similarity between subduction zone and volcanic tremor has led to suggestions that slow slip involves fluid migration on or near the plate interface. Alternatively, evidence is accumulating to support the notion that tremor results from shear failure during slow slip. Global observations of the location, spatial extent, magnitude, duration, slip rate, and periodicity of these aseismic slip transients indicate significant variation that may be exploited to better understand their generation. Most slow slip events occur just downdip of the seismogenic zone, consistent with rate‐ and state‐dependent frictional modeling that requires unstable to stable transitional properties for slow slip generation. At a few convergent margins the occurrence of slow slip events within the seismogenic zone makes it highly likely that transitions in frictional properties exist there and are the loci of slow slip nucleation. Slow slip events perturb the surrounding stress field and may either increase or relieve stress on a fault, bringing it closer to or farther from earthquake failure, respectively. This paper presents a review of slow slip events and related seismic tremor observed at plate boundaries worldwide, with a focus on circum‐Pacific subduction zones. Trends in global observations of slow slip events suggest that (1) slow slip is a common phenomena observed at almost all subduction zones with instrumentation capable of recording it, (2) different frictional properties likely control fast versus slow slip, (3) the depth range of slow slip may be related to the thermal properties of the plate interface, and (4) the equivalent seismic moment of slow slip events is proportional to their duration (Moατ), different from the Moατ3 scaling observed for earthquakes.

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Change in seismic activity in the Tokai region related to weakening and strengthening of the interplate coupling

Cited by 8 publications

References 17 publications

Non-volcanic Tremor: A Window into the Roots of Fault Zones

Non-volcanic Tremor: A Window into the Roots of Fault Zones

New Frontiers in Integrated Solid Earth Sciences

Slow slip events and seismic tremor at circum‐Pacific subduction zones

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