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首页> 外文期刊>Earth, planets and space: EPS >Source process of the 2011 off the pacific coast of tohoku earthquake inferred from waveform inversion with long-period strong-motion records
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Source process of the 2011 off the pacific coast of tohoku earthquake inferred from waveform inversion with long-period strong-motion records

机译：根据长期强运动记录的波形反演推断东北太平洋2011年地震的震源过程

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摘要

We have investigated the rupture process of the 2011 off the Pacific coast of Tohoku Earthquake using a multitime- window linear waveform inversion method using long-period strong-ground motion data. From the record section of the long-period motion of the 3 phases, it is indicated that the rupture process mainly consists of the 3 stages. We have assumed a single planar fault model of 468 km long in strike and 228 km wide in dip. The seismic moment of this earthquake was estimated to be 4.3 × 10~(22) N m (M_w 9.0). The inverted slip distribution shows a large asperity with a maximum slip of about 47 m which is located on the shallower part of the fault plane. The rupture process is divided into three stages: a first stage with moderate slip; a second stage with large and long-duration slip in the shallow part of the fau and a third stage with relatively small and short-duration slip in the southern part of the fault. The feature of the ground motion suggested from the record section is well represented by the peak moment rate distributions, rather than the slip distributions. The rupture velocity is around 3 km/s in the first and third stages, while rupture progression was suspended for a while before the rupture of the asperity.
机译：我们使用长期强地面运动数据，采用多时窗线性波形反演方法研究了2011年东北太平洋地震海岸的破裂过程。从三个阶段的长周期运动的记录部分可以看出，破裂过程主要由三个阶段组成。我们假设了一个单一的平面断层模型，其走向长468 km，倾角宽228 km。该地震的地震矩估计为4.3×10〜（22）N m（M_w 9.0）。倒转滑移分布显示出较大的凹凸不平，最大滑移约为47 m，位于断层平面的较浅部分。破裂过程分为三个阶段。第二阶段，在断层浅部具有大而长时间的滑动;第三阶段在断层南部具有相对较小的持续时间。记录部分建议的地震动特征可以由峰值矩速率分布而不是滑动分布很好地表示。在第一阶段和第三阶段，破裂速度约为3 km / s，而破裂过程在凹凸不平破裂之前暂停了一段时间。

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