Stress before and after the 2011 great Tohoku‐oki earthquake and induced earthquakes in inland areas of eastern Japan

Yoshida, Keisuke; Hasegawa, Akira; Okada, Tomomi; Iinuma, Toshitaka; Ito, Yoshihiro; Asano, Youichi

doi:10.1029/2011gl049729

Cited by 134 publications

(130 citation statements)

References 14 publications

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“…Occurrence of normal fault type, or strike-slip type, events in the landward plate have also been reported by Asano et al (2011) using landbased data. A change of focal mechanisms in the landward plate is thought to correspond with a stress change caused by a large slip at the plate boundary Kato et al, 2011;Imanishi et al, 2012;Yoshida et al, 2012). Within the oceanic plate, most earthquakes had a normal fault type, or strike-slip type, mechanism.…”

Section: Resultsmentioning

confidence: 99%

Precise aftershock distribution of the 2011 off the Pacific coast of Tohoku Earthquake revealed by an ocean-bottom seismometer network

et al. 2012

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The 2011 off the Pacific coast of Tohoku Earthquake occurred at the plate boundary between the Pacific plate and the landward plate on March 11, 2011, and had a magnitude of 9. Many aftershocks occurred following the mainshock. Obtaining a precise aftershock distribution is important for understanding the mechanism of earthquake generation. In order to study the aftershock activity of this event, we carried out extensive seafloor aftershock observations using more than 100 ocean-bottom seismometers just after the mainshock. A precise aftershock distribution for approximately three months over the whole source area was obtained from the observations. The aftershocks form a plane dipping landward over the whole area, nevertheless the epicenter distribution is not uniform. Comparing seismic velocity structures, there is no aftershock along the plate boundary where a large slip during the mainshock is estimated. Activity of aftershocks in the landward plate in the source region was high and normal fault-type, and strike-slip-type, mechanisms are dominant. Within the subducting oceanic plate, most earthquakes have also a normal fault-type, or strike-slip-type, mechanism. The stress fields in and around the source region change as a result of the mainshock.

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Section: Resultsmentioning

confidence: 99%

Precise aftershock distribution of the 2011 off the Pacific coast of Tohoku Earthquake revealed by an ocean-bottom seismometer network

et al. 2012

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“…Another contribution to the stress field change as seen in Figure 6 Figure 5b), large jump due to the co-seismic effect of the M9 (cf. Yoshida et al, 2012;Hasegawa et al, 2012), indication of a short term-transient further increase of σm over ∼ 1 yr until a plateau is reached at t ∼ 1 yr (upper dashed lines show mean σm for 1 ≤ t ≤ 3 yr), and ongoing reduction of tension and possible eventual recovery of the compressive long-term state starting at ∼ 2015.…”

Section: Time-dependent Crustal Stressmentioning

confidence: 99%

“…These studies suggested near-complete shear stress drop along the fault due to the M9, indicating ∼ 10 MPa pre-earthquake deviatoric stress levels close to the fault interface Hardebeck, 2012), and closer to ∼ 50 MPa in the upper crust (Yang et al, 2013). Yoshida et al (2012) studied the change in seismicity in the northern Honshu area before and right after the M9 and compared results with estimates from coseismic stress modeling. From changes in seismicity-inferred deviatoric stress patterns, the authors inferred that pre-M9 stress levels were regionally variable, and a triggering scenario of co-seismic stress change implied shear stress levels lower than ∼ 1 MPa regionally before the earthquake.…”

Section: Introductionmentioning

confidence: 99%

Stress change before and after the 2011 M9 Tohoku-oki earthquake

Becker¹,

Hashima²,

Freed³

et al. 2018

Preprint

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Megathrust systems hold important clues for our understanding of longand short-term plate boundary dynamics, and the 2011 M9 Tohoku-oki earthquake provides a data-rich case in point. Here, we show that the F-net moment tensor catalog indicates systematic changes in crustal stress in the years leading up to the M9, due to the co-seismic effect, and for the last few years due to viscous relaxation. We explore the match between imaged stress change and the perturbations that are expected from 3-D, mechanical models of the visco-elastic relaxation and afterslip effects of the M9. While these models were constructed based on geodetic and structural seismology constraints alone, they match many characteristics of the seismicityinferred stress change. This provides additional confidence in the modeling approach, and new clues for our understanding of plate boundary dynamics for the Japan trench. The success of deterministic approaches for explor- * Corresponding Address: Institute of Geophysics, 10100 Burnet Road (R2200) Austin, TX 78758-4445, USA. Phone: ++1 (512) 471-0410Email address: twb@ig.utexas.edu (Thorsten W. Becker)In press at EPSL September 28, 2018ing crustal stress change also implies that joint inversions using stress from focal mechanisms and geodetic constraints may be feasible. Such future efforts should provide key insights into time-dependent seismic hazard including earthquake triggering scenarios.

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“…An alternative approach is to model the full spatial distribution of static stress changes due to the mainshock, and to map the observed stress changes with adequate resolution to compare to the modeled stress patterns of the direction and amplitude of the rotation (e.g., Yoshida et al 2012;Hasegawa et al 2012). Numerical inversion (Wesson and Boyd 2007;Yoshida et al 2012;Yang et al 2013) or forward modeling (e.g., Yoshida et al 2014Yoshida et al , 2015 can then be used to determine the background differential stress.…”

Section: Discussionmentioning

confidence: 99%

The spatial distribution of earthquake stress rotations following large subduction zone earthquakes

Hardebeck

2017

Earth Planets Space

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Rotations of the principal stress axes due to great subduction zone earthquakes have been used to infer low differential stress and near-complete stress drop. The spatial distribution of coseismic and postseismic stress rotation as a function of depth and along-strike distance is explored for three recent M ≥ 8.8 subduction megathrust earthquakes. In the down-dip direction, the largest coseismic stress rotations are found just above the Moho depth of the overriding plate. This zone has been identified as hosting large patches of large slip in great earthquakes, based on the lack of high-frequency radiated energy. The large continuous slip patches may facilitate near-complete stress drop. There is seismological evidence for high fluid pressures in the subducted slab around the Moho depth of the overriding plate, suggesting low differential stress levels in this zone due to high fluid pressure, also facilitating stress rotations. The coseismic stress rotations have similar along-strike extent as the mainshock rupture. Postseismic stress rotations tend to occur in the same locations as the coseismic stress rotations, probably due to the very low remaining differential stress following the near-complete coseismic stress drop. The spatial complexity of the observed stress changes suggests that an analytical solution for finding the differential stress from the coseismic stress rotation may be overly simplistic, and that modeling of the full spatial distribution of the mainshock static stress changes is necessary.

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Stress before and after the 2011 great Tohoku‐oki earthquake and induced earthquakes in inland areas of eastern Japan

Cited by 134 publications

References 14 publications

Precise aftershock distribution of the 2011 off the Pacific coast of Tohoku Earthquake revealed by an ocean-bottom seismometer network

Precise aftershock distribution of the 2011 off the Pacific coast of Tohoku Earthquake revealed by an ocean-bottom seismometer network

Stress change before and after the 2011 M9 Tohoku-oki earthquake

The spatial distribution of earthquake stress rotations following large subduction zone earthquakes

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