Source model for generating strong ground motions during the 2011 off the Pacific coast of Tohoku Earthquake
Source model for generating strong ground motions during the 2011 off the Pacific coast of Tohoku Earthquake
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DOI：
10.5047/eps.2011.06.044
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发表时间：
2011-01-01
影响因子：
3
通讯作者：
Irikura, Kojiro
中科院分区：
文献类型：
--
作者：
Kurahashi, Susumu;Irikura, Kojiro
基于经验绿色函数方法的特征化震源模型，通过比较主震和合成运动的观测记录，估算了2011年日本东北太平洋近海地震（M（w）9.0）期间产生强地面运动的震源模型。特征震源模型由几个强震发生区（SMGAs）叠加在较大的地震破裂区的高滑动速度。最终的源模型有五个不同大小的SMGA，使用试错法。SMGA 1位于南三陆冲震源区的震源以西，SMGA 2位于中三陆冲震源区的震源以北。SMGA 3、SMGA 4和SMGA 5位于主震震源断层的下倾边缘附近，范围从近海宫城到近海茨木县。从起始时间起的延迟时间在SMGA 1处为15.6秒，在SMGA 2处为66.4秒，在SMGA 3处为68.4秒，在SMGA 4处为109.7秒，在SMGA 5处为118.2秒。地震研究委员会估计，这些震源区（包括五个SMGA）发生地震的概率低于
A source model for generating strong ground motions during the 2011 off the Pacific coast of Tohoku Earthquake (M(w) 9.0) is estimated from a comparison of the observed records of the mainshock and synthetic motions, based on the characterized source model using the empirical Green's function method. The characterized source model consists of several strong-motion-generation-areas (SMGAs) with high slip velocity superimposed upon the larger rupture area of the earthquake. The final source model has five SMGAs with different sizes, using a trial and error approach. SMGA 1 is located west of the hypocenter in the source region of Southern Sanriku-oki and SMGA 2 in that of the Middle Sanriku-oki, north of the hypocenter. SMGA 3, SMGA 4, and SMGA 5 are located near the down-dip edge of the mainshock source fault, ranging from offshore Miyagi to offshore Ibaraki prefectures. The delay times from the origin time are 15.6 sec at SMGA 1, 66.4 sec at SMGA 2, 68.4 sec at SMGA 3, 109.7 sec at SMGA 4 and 118.2 sec at SMGA 5. The probabilities of earthquake occurrence in these source regions including the five SMGAs have been estimated by the Earthquake Research Committee at less than