Coseismic slip distribution of the 2011 off the Pacific coast of Tohoku Earthquake (M 9.0) estimated based on GPS data— Was the asperity in Miyagi-oki ruptured?

Iinuma, Toshitaka; Ohzono, Mako; Ohta, Yusaku; Miura, Satoshi

doi:10.5047/eps.2011.06.013

Cited by 110 publications

(99 citation statements)

References 19 publications

(15 reference statements)

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“…We also used the slip model for the 2011 M w 9 earthquake provided by Iinuma et al (2011). This tendency of positive Coulomb stress is also estimated by the slip model by Iinuma et al (2011). If we assume a smaller value of the friction coefficient (0.4), the Coulomb stress change is still positive except almost zero for the region of Subsection 2.1.…”

Section: Calculation Of Coulomb Stress Changementioning

confidence: 99%

“…For all the fault planes, the calculated Coulomb stress change is positive, whereas the auxiliary planes of some sequences are not positive. We also used the slip model for the 2011 M w 9 earthquake provided by Iinuma et al (2011). This tendency of positive Coulomb stress is also estimated by the slip model by Iinuma et al (2011).…”

Section: Calculation Of Coulomb Stress Changementioning

confidence: 99%

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Shallow inland earthquakes in NE Japan possibly triggered by the 2011 off the Pacific coast of Tohoku Earthquake

et al. 2011

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Shallow seismic activity in the crust of the overriding plate west of the source area increased significantly after the 2011 M w 9.0 Tohoku earthquake which ruptured the plate boundary to the east off northern Japan beneath the Pacific Ocean. In order to understand the cause of this distinctive change in seismicity, we have precisely relocated earthquake hypocenters for several earthquake sequences that occurred during the period March 11-April 6, 2011, following the Tohoku earthquake by the double-difference method. Hypocenter distributions were used to discriminate the fault plane from the auxiliary plane of the focal mechanisms for those earthquake sequences. We then calculated the Coulomb stress change on those fault planes caused by the 2011 M w 9 earthquake. In all cases, the estimated Coulomb stress changes at the plausible fault planes for those post-mainshock sequences are positive. The positive Coulomb stress change is mainly due to the reduction of normal stress on the fault plane of the earthquake sequences by the large, low-angle thrust fault responsible for the 2011 M w 9 earthquake. The present observations suggest that static stress transfer possibly triggered those post-mainshock earthquake sequences.

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Section: Calculation Of Coulomb Stress Changementioning

confidence: 99%

Section: Calculation Of Coulomb Stress Changementioning

confidence: 99%

Shallow inland earthquakes in NE Japan possibly triggered by the 2011 off the Pacific coast of Tohoku Earthquake

et al. 2011

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“…The fault inversion work has been done by many scientists (e.g. Iinuma et al 2011;Lay et al 2011;Pollitz et al 2011). Such as, Pollitz et al (2011) inverted the slip model using on-land GPS and offshore GPS data based on spherical model.…”

Section: M Pa C T O F T H E L Ay E R I N G E F F E C T O N T H E G mentioning

confidence: 99%

Effects of Earth's layered structure, gravity and curvature on coseismic deformation

Dong

Sun

Xiao-hong

et al. 2014

Geophysical Journal International

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S U M M A R YThe effects of Earth's layered structure, gravity and curvature on coseismic deformation are systematically quantified for all fundamental point sources and some finite-fault sources, respectively. The point-source simulations show that the layering effect (about ≤25 per cent) is significantly higher than the gravity effect (about ≤11 per cent) and the curvature effect (about ≤5 per cent). A case study on the 2011 M w 9.0 Tohoku earthquake is made to quantify the uncertainties of the dislocation models of large earthquakes, in which the three different effects are neglected. Finally, it is investigated how geodetic finite-fault slip inversions are affected by neglecting the layering effect.

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“…Iinuma et al (2011) estimated the slip distribution by using GPS data at 345 GEONET stations and 38 Tohoku University stations (Ohzono et al, 2012). The results estimated a widely distributed slip with a maximum value of about 35 m along a line about 100 km from the trench.…”

Section: Some Important Results Of Gpsa Observations Before 2011mentioning

confidence: 99%

Seafloor Geodetic Approaches to Subduction Thrust Earthquakes

Fujimoto¹

2014

Monogr. Environ. Earth Planets

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Observation systems and some observed results of seafloor geodesy are reviewed with a focus on the research activities of Japanese groups, especially those of Tohoku University. Seafloor acoustic ranging has been adopted as the simplest way to continuously monitor local crustal activities. The GPS-Acoustic (GPSA) method has been the most important for seafloor positioning. It seems that commercial technologies can be used to lessen the considerable differences in repeatability and spatio-temporal resolution of GPSA and land based GPS. Ocean bottom pressure sensors have been used to continuously monitor vertical crustal movements. Improvements in the resolution and long-term stability of pressure sensors will lead to monitoring slow slip events and interplate locking. Ocean bottom and underwater gravimeters have been developed for precise gravity mapping and monitoring mass change beneath the seafloor. The 2011 Tohoku-oki earthquake is an historical event demonstrating that seafloor geodetic observations are crucial to understanding the mechanism of giant earthquakes. Coseismic displacements detected through geodetic observations on the seafloor have indicated huge slips on the shallow part of the plate boundary. A slow slip event near the zone of the coseismic slip preceding the main event has been detected from slight pressure variations. This illustrates the importance of real-time monitoring with a cabled seafloor observatory, which is also a key to establishing a reliable early tsunami warning system.

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Coseismic slip distribution of the 2011 off the Pacific coast of Tohoku Earthquake (M 9.0) estimated based on GPS data— Was the asperity in Miyagi-oki ruptured?

Cited by 110 publications

References 19 publications

Shallow inland earthquakes in NE Japan possibly triggered by the 2011 off the Pacific coast of Tohoku Earthquake

Shallow inland earthquakes in NE Japan possibly triggered by the 2011 off the Pacific coast of Tohoku Earthquake

Effects of Earth's layered structure, gravity and curvature on coseismic deformation

Seafloor Geodetic Approaches to Subduction Thrust Earthquakes

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