000019174 001__ 19174
000019174 005__ 20170118182303.0
000019174 04107 $$aeng
000019174 046__ $$k2017-01-09
000019174 100__ $$aKurahashi, Susumu
000019174 24500 $$aBroadband Ground Motion Simulations of Mega-Thrust Subduction Earthquakes Based on Multi-Scale Heterogeneous-Source Model

000019174 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019174 260__ $$b
000019174 506__ $$arestricted
000019174 520__ $$2eng$$aSix segments for the region off the coast of Tohoku from Middle Sanriku-Oki to Ibaragi-Oki were indicated with seismic activities of past 400 years by the Headquarter of Earthquake Research Promotion, Japan (HERP) before the 2011 Mw 9 Tohoku earthquake. Long-term forecasts for individual segments in this region were done so that Mw 7–8.4 earthquakes would occur within those segments, having different recurrence times from one to the other. The information about the source process and ground motions of this earthquake was obtained by dense networks of geophysical instruments including strong-motion, teleseismic, tsunami, and geodetic sensors. Most of slip distribution inverted from long-period records such as geodetic and tsunami data are placed at depths shallower than the hypocenter toward the trench. On the other hand, shortperiod seismic energy obtained by the back-projection method was generated mainly from the down-dip areas near the coasts of Pacific coast. We also estimate a short-period source model for generating strong ground motions from this earthquake by comparing the observed records from the mainshock with synthetic motions based on an asperity source model and the empirical Green’s function method. We find the segmentation controls the characteristics of ground motions from the rupture process inversion of near-field strong motion records as well as earthquake occurrence in the source region of this event. The period-dependent source behavior of this earthquake can be interpreted by a multi-scale heterogeneous earthquake model. Recent other Mw 9.0 class subduction earthquakes such as the 2004 Mw 9.1 Sumatra earthquake and the 2010 Mw 8.8 Maule earthquake are known to have almost the same period-dependent source model mentioned above. Then, we propose an improved idea for recipe of predicting strong ground motions for mega-thrust subduction earthquakes based on the multi-scale heterogeneous-source model.

000019174 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019174 653__ $$athe 2011 Tohoku earthquake, segmentation, subduction earthquake, strong ground motion, strong motion generation area

000019174 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019174 720__ $$aKurahashi, Susumu$$iIrikura, Kojiro
000019174 8560_ $$ffischerc@itam.cas.cz
000019174 8564_ $$s987726$$uhttps://invenio.itam.cas.cz/record/19174/files/3019.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3019.
000019174 962__ $$r16048
000019174 980__ $$aPAPER