Source process of the 2011 off the Pacific coast of Tohoku Earthquake with the combination of teleseismic and strong motion data

Yoshida, Yasuhiro; Ueno, Hiroshi; Muto, D.; Aoki, Shigeki

doi:10.5047/eps.2011.05.011

Cited by 126 publications

(80 citation statements)

References 20 publications

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“…3 and Section 4.2), most of the arrival-time data of the primary crests observed at GPS buoys or OBPGs (Table 1) can be reasonably ex- plained; a highly-uplifted area in the tsunami source area is possibly located several tens of kilometers east of the epicenter. The area of large slip obtained from the inversion of seismic strong-motion waves (Yoshida et al, 2011) is almost coincident with the small area marked in Fig. 3.…”

Section: The Accuracy Of the Estimated Tsunami Source Areasupporting

confidence: 63%

Tsunami source area of the 2011 off the Pacific coast of Tohoku Earthquake determined from tsunami arrival times at offshore observation stations

et al. 2011

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The source area of the tsunami generated by the 2011 off the Pacific coast of Tohoku Earthquake estimated from tsunami arrival times recorded at offshore wave gauges, GPS buoys, cabled ocean-bottom pressure gauges, and tsunami buoys is about 500-km long with a maximum width of approximately 200 km. The 2011 tsunami source area includes several segments of previous recurring large earthquakes. However, the northern and southern parts of the large Japan Trench segment were not included in the source area. The southern off-Boso-Peninsula part of the Japan Trench segment has the potential to generate a large tsunami earthquake in near future.

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Section: The Accuracy Of the Estimated Tsunami Source Areasupporting

confidence: 63%

Tsunami source area of the 2011 off the Pacific coast of Tohoku Earthquake determined from tsunami arrival times at offshore observation stations

et al. 2011

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“…7. Comparison of the position of the profile in this study with the aftershock epicenter distribution determined by the OBS network, focal mechanisms of aftershocks obtained by the OBS network (Shinohara et al, 2012) and by the automated moment tensor determination using the land seismic network (F-net) (Fukuyama et al, 1998), the slip distribution during the mainshock using strong motion data (Yoshida et al, 2011) and the slip distribution of the afterslip by the land GPS network as of December 2011 (Ozawa et al, 2011;Geospatial Information Authority of Japan, 2011). The red and yellow contours indicate the amount of co-seismic slips and afterslip, respectively.…”

Section: Resultsmentioning

confidence: 97%

“…Red circles indicate the hypocenters of the aftershocks, and diameters of circles correspond to magnitudes. The red and blue bars show the region which has a co-seismic slip greater than 4 m (Yoshida et al, 2011) and the region of the afterslip greater than 0.8 m as of December 2011 (Ozawa et al, 2011;Geospatial Information Authority of Japan, 2011). Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The southern edge of the rupture zone of the mainshock was positioned at a distance of approximately 200 km from the southern end of the survey profile from the studies of the rupture process (e.g. Yoshida et al, 2011) and the aftershock distribution deduced from the OBS data (Shinohara et al, , 2012 (Figs. 6 and 7).…”

Section: Resultsmentioning

confidence: 99%

“…6 and 7). Yoshida et al (2011) estimated the source process of the 2011 mainshock from teleseismic P waves and regional strong motion data. According to their results, a co-seismic slip greater than 4 m is estimated in the northern part of the profile from a distance of approximately 190 km.…”

Section: Resultsmentioning

confidence: 99%

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P-wave velocity structure in the southernmost source region of the 2011 Tohoku earthquakes, off the Boso Peninsula, deduced by an ocean bottom seismographic survey

et al. 2012

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We present the result of a seismic experiment conducted using ocean bottom seismometers and controlled sources in the region off Ibaraki and the Boso Peninsula. This region is the southern edge of the rupture zone of the 2011 off the Pacific coast of Tohoku Earthquake. We estimated the P-wave seismic velocity structure beneath the profile using a 2-D ray-tracing method. The crustal structure in the southern area is more heterogeneous than that of the northern area. This heterogeneity is thought to be related with subducting the Philippine Sea plate (PHS). The plate boundary between the landward plate and the Pacific plate (PAC) is positioned at depths of 20 km at a distance of 170 km from the southern end of the profile. The subducting PHS is imaged on the southern part of the profile. However, we could not obtain a distinct image of the contact zone of PHS and PAC. The contact zone of PHS and PAC is estimated to have a large heterogeneity resulting from strong deformation due to the collision of the two plates. We infer that the termination of the rupture, and the large afterslip in the collision region, are caused by this strong heterogeneity.

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A methodology for near‐field tsunami inundation forecasting: Application to the 2011 Tohoku tsunami

et al. 2014

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Existing tsunami early warning systems in the world can give either one or a combination of estimated tsunami arrival times, heights, or qualitative tsunami forecasts before the tsunami hits near-field coastlines. A future tsunami early warning system should be able to provide a reliable near-field tsunami inundation forecast on high-resolution topography within a short time period. Here we describe a new methodology for near-field tsunami inundation forecasting. In this method, a precomputed tsunami inundation and precomputed tsunami waveform database is required. After information about a tsunami source is estimated, tsunami waveforms at nearshore points can be simulated in real time. A scenario that gives the most similar tsunami waveforms is selected as the site-specific best scenario and the tsunami inundation from that scenario is selected as the tsunami inundation forecast. To test the algorithm, tsunami inundation along the Sanriku Coast is forecasted by using source models for the 2011 Tohoku earthquake estimated from GPS, W phase, or offshore tsunami waveform data. The forecasting algorithm is capable of providing a tsunami inundation forecast that is similar to that obtained by numerical forward modeling but with remarkably smaller CPU time. The time required to forecast tsunami inundation in coastal sites from the Sendai Plain to Miyako City is approximately 3 min after information about the tsunami source is obtained. We found that the tsunami inundation forecasts from the 5 min GPS, 5 min W phase, 10 min W phase fault models, and 35 min tsunami source model are all reliable for tsunami early warning purposes and quantitatively match the observations well, although the latter model gives tsunami forecasts with highest overall accuracy. The required times to obtain tsunami forecast from the above four models are 8 min, 9 min, 14 min, and 39 min after the earthquake, respectively, or in other words 3 min after receiving the source model. This method can be useful in developing future tsunami forecasting systems with a capability of providing tsunami inundation forecasts for locations near the tsunami source area.

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Source process of the 2011 off the Pacific coast of Tohoku Earthquake with the combination of teleseismic and strong motion data

Cited by 126 publications

References 20 publications

Tsunami source area of the 2011 off the Pacific coast of Tohoku Earthquake determined from tsunami arrival times at offshore observation stations

Tsunami source area of the 2011 off the Pacific coast of Tohoku Earthquake determined from tsunami arrival times at offshore observation stations

P-wave velocity structure in the southernmost source region of the 2011 Tohoku earthquakes, off the Boso Peninsula, deduced by an ocean bottom seismographic survey

A methodology for near‐field tsunami inundation forecasting: Application to the 2011 Tohoku tsunami

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