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首页> 外文期刊>Earth, planets and space: EPS >Direct observation of rupture propagation during the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0) using a small seismic array
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Direct observation of rupture propagation during the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0) using a small seismic array

机译：使用小型地震阵列直接观测2011年东北太平洋太平洋海岸地震（Mw 9.0）的破裂传播

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摘要

A great earthquake of Mw 9.0 occurred on March 11, 2011 off the coast of Tohoku region, Northeast Honshu, Japan. Strong ground motions from the earthquake were recorded at 4 stations of a small seismic array, with an aperture of about 500 m, located 120 km away from the epicenter. Peak ground acceleration exceed the full scale of 2 g on the horizontal components, and was larger than 1 g even on the vertical component. Two prominent bursts and at least two following smaller bursts are identified on the strong-motion records which lasted for longer than 200 s. We have performed semblance analysis to estimate the rupture propagation during the earthquake using coherent seismograms at frequencies of 0.5-2 Hz. The rupture seems to consist of at least four stages. Rupture propagated in a northerly direction in the beginning 50 s forming the first burst, then proceeded to the southwest from the epicenter in the next 50 s during the second burst. The rupture further extended southwests in the following 40 s, and finally migrated to the south for about 30 s. A small seismic array makes it possible to observe rupture propagation during a large earthquake even with a small number of stations.
机译：2011年3月11日，日本东北本州东北地区沿海发生了9.0兆瓦大地震。在距震中120公里处的一个小型地震阵列的四个站点上记录了地震造成的强烈地面运动，该阵列的孔径约为500 m。地面峰值加速度在水平分量上超过了2 g的满刻度，甚至在垂直分量上也超过了1 g。在持续时间超过200 s的强运动记录中，识别出两个突出的爆发和至少两个随后的较小的爆发。我们使用相干地震图在0.5-2 Hz的频率下进行了相似性分析，以估计地震期间的破裂传播。破裂似乎包括至少四个阶段。破裂在形成第一个爆发的最初50 s开始向北传播，然后在第二个爆发的接下来的50 s从震中向西南传播。破裂在接下来的40 s内进一步向西南延伸，并最终向南迁移了30 s。小地震阵列即使在台数较少的情况下，也可以观察大地震期间的破裂传播。

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