Displacement Above the Hypocenter of the 2011 Tohoku-Oki Earthquake

Sato, Minoru; Ishikawa, Tadashi; Ujihara, Naoto; Yoshida, Shigeru; Fujita, Masayuki; Mochizuki, Masahito; Asada, Akira

doi:10.1126/science.1207401

Cited by 440 publications

(376 citation statements)

References 3 publications

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“…This point has been monitored since 2002 and was found to move landward by 8.5 cm/yr (Fujita et al, 2006). Sato et al (2011) reported its coseismic trenchward movement of ~24 m by the 2011 earthquake. MYGI was re-occupied 5 times in 10 months after this earthquake (Japan Coast Guard, 2012).…”

Section: Changes In Crustal Movements In 2011mentioning

confidence: 99%

Accelerated pacific plate subduction following interplate thrust earthquakes at the Japan trench

Heki

Mitsui

2013

Earth and Planetary Science Letters

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Interplate thrust earthquakes are usually followed by afterslips, and they let the fore-arc move slowly trenchward. However, we do not know if the subducting oceanic plate is accelerated landward after such earthquakes. The westward velocity of Global Positioning System (GPS) stations in NE Japan show gradient decreasing from east to west reflecting the E-W contractional strain built up by the inter-plate coupling. Here we show that such coupling significantly enhanced (~1.5 times) after the 2003 Tokachi-Oki earthquake (M w 8.0), Hokkaido, in the segments adjacent to the ruptured fault. The coupling seems to be further enhanced (~3 times) after the 2011 Tohoku-Oki earthquake (M w 9.0). It is unlikely that interplate friction suddenly increased over such a large region, and relatively strong pre-2003 coupling there would not allow such enhancements even if full coupling is attained. Hence they are attributable to the temporary acceleration of the Pacific Plate subduction. We propose a simple 2-dimensional model in which down-dip acceleration of the slab let the force balance rapidly recover promoted by a thin low-viscosity layer on the slab surface. The accelerated subduction would account for temporary activations of regional interplate seismicity after megathrust earthquakes.

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Section: Changes In Crustal Movements In 2011mentioning

confidence: 99%

Accelerated pacific plate subduction following interplate thrust earthquakes at the Japan trench

Heki

Mitsui

2013

Earth and Planetary Science Letters

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“…So, the resulting seafloor displacement determinations are probably contaminated by deformation induced by foreshock, aftershock and aseismic afterslip. Fortunately, as analyzed by Sato et al [12], the effects of such factors are negligible compared with the co-seismic faulting. Therefore most of the GPS/acoustic observed seafloor co-seismic displacements are induced by co-seismic rupture.…”

Section: Datamentioning

confidence: 99%

Static slip model of the M w 9.0 Tohoku (Japan) earthquake: Results from joint inversion of terrestrial GPS data and seafloor GPS/acoustic data

2012

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Based on co-seismic displacements recorded by terrestrial GPS stations and seafloor GPS/acoustic stations, the static slip model of the 2011 M w 9.0 Tohoku earthquake was determined by inverting the data using a layered earth model. According to a priori information, the rupture surface was modeled with a geometry that is close to the actual rupture, in which the fault dip angle increases with depth and the fault strike varies with the trend of the trench. As shown by the results inferred from the joint inversion, the "geodetic" moment is 3.68 × 10 22 N m, corresponding to M w 9.01, and the maximum slip is positioned at a depth of 13.5 km with a slip magnitude of 45.8 m. Rupture asperities with slip exceeding 10 m are mainly distributed from 39.6 to 36.97°N, over a length of almost 240 km along the trench. The slip was mostly concentrated at depths shallower than 40 km, up-dip of the hypocenter. "Checkerboard" tests reveal that a joint inversion of multiple datasets can resolve the slip distribution better than an inversion with terrestrial GPS data only-especially when aiming to resolve slip at shallow depths. Thus, the joint inversion results obtained by this work may provide a more reliable slip model than the results of other studies that are only derived from terrestrial GPS data or seismic waveform data. M w 9.0 Tohoku earthquake, static slip model, terrestrial GPS data, seafloor GPS/acoustic data, curved rupture surface Citation:Diao F Q, Xiong X, Zheng Y. Static slip model of the M w 9.0 Tohoku (Japan) earthquake: Results from joint inversion of terrestrial GPS data and seafloor GPS/acoustic data.

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“…This earthquake was the largest earthquake in Japan on record (TAJIMA et al 2013), and was one of the largest events ever recorded on our planet with modern instrumentation. Intense crustal deformations in the near-field region were detected by the on-shore GPS Earth Observation Network (GEONET) (OZAWA et al 2012;SATO et al 2011) and an off-shore GPS/ acoustic system. The maximum co-seismic horizontal displacement recorded by the two observation systems were 5.2 and 31.5 m (KIDO et al 2011), respectively.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Far-Field Co-seismic and Post-seismic Responses Caused by the 2011 M W 9.0 Tohoku-Oki Earthquake

Shao

Wei

Zhang

et al. 2015

Pure Appl. Geophys.

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Abstract-We analyzed the far-field co-seismic response of the M W 9.0 Tohoku-Oki earthquake, which occurred on March 11th 2011 at the Japan Trench plate boundary. Our analysis indicates that the far-field co-seismic displacement was very sensitive to the magnitude of this event, and that a significant co-seismic surface displacement from earthquakes in the Japan Trench region can be observed in Eurasia only for events of M W C 8.0. We also analyzed the temporal characteristics of the near-field post-seismic deformation caused by the afterslip and the viscoelastic relaxation following the Japan earthquake. Next, we performed a simulation to analyze the influence of the two post-seismic effects previously mentioned on the far-field post-seismic crustal deformation. The simulation results help explain the post-seismic crustal deformation observed on the Chinese mainland 1.5 years after the event. Fitting results revealed that after the M W 9.0 Tohoku-Oki earthquake, the afterslip decayed exponentially, and may eventually disappear after 4 years. The far-field post-seismic displacement in Eurasia caused by the viscoelastic relaxation following this earthquake will reach the same magnitude as the co-seismic displacement in approximately 10 years. In addition, the co-and post-seismic Coulomb stress on several NE-trending faults in the northeastern and northern regions of the Chinese mainland were significantly enhanced because of the M W 9.0 earthquake, especially on the Yilan-Yitong and the Dunhua-Mishan faults (the northern section of the Tan-Lu fault zone) as well as the Yalujiang and the FuyuZhaodong faults.

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Displacement Above the Hypocenter of the 2011 Tohoku-Oki Earthquake

Cited by 440 publications

References 3 publications

Accelerated pacific plate subduction following interplate thrust earthquakes at the Japan trench

Accelerated pacific plate subduction following interplate thrust earthquakes at the Japan trench

Static slip model of the M w 9.0 Tohoku (Japan) earthquake: Results from joint inversion of terrestrial GPS data and seafloor GPS/acoustic data

Analysis of the Far-Field Co-seismic and Post-seismic Responses Caused by the 2011 M W 9.0 Tohoku-Oki Earthquake

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