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从IRIS全球数字地震台网长周期记录中,选取震中距位于30°～90°的垂直向远震P波资料,反演了2003年9月27日中、俄、蒙边界MS7.9地震及10月1日MS7.3强余震的地震矩张量解,研究了MS7.9地震的时空破裂过程.参考余震的空间分布及周围断层走向,确定MS7.9地震发震断层走向127°、倾角为79°、滑动角为171°.MS7.9地震震源破裂过程反演结果表明,整个破裂过程持续了37s,释放标量地震矩0.97×1020N·m.破裂主要发生在长110km,宽30km的中地壳以上,最大位错3.6m.起始破裂处不是滑动量最大的地方.断层面上显示出两个显著的、滑动量超过2.0m的破裂区.破裂传播至MS7.3震源区附近时,滑动量迅速减小,显示出破裂传播过程的受阻停止,反映了障碍体引起的破裂过程的不均匀性.
From the long-period record of IRIS global digital seismograph network, the vertical teleseismic P-wave data at epicenter distance from 30 ° to 90 ° were selected to retrieve the MS7.9 earthquake on the border between Russia and Mongolia on September 27, 2003 and The seismic moment tensor solution of MS7.3 strong aftershock on October 1 was used to study the spatiotemporal rupture process of MS7.9 earthquakes.Referring to the spatial distribution of aftershocks and the strike of the surrounding faults, Is 79 ° and the sliding angle is 171 °. The inversion results show that the entire rupture process lasted for 37s and the release of scalar seismic moment was 0.97 × 1020N · m. The rupture occurred mainly in 110km long and 30km wide Above the crust, the maximum dislocation is 3.6m. The initial rupture is not the place with the greatest slip, and two significant rupture zones with slip over 2.0m are shown on the fault plane. When the rupture propagates near the MS7.3 focal zone, Slippage decreased rapidly, indicating that the propagation of the crack stopped and stopped, reflecting the non-uniformity of the rupture process caused by the obstacle.