Rupture process of an earthquake with kilometric size fault inferred from the modeling of near-source records
Rupture process of an earthquake with kilometric size fault inferred from the modeling of near-source records
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通过近源记录建模推断出千米级断层地震的破裂过程
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
M. Bouchon
中科院分区：
文献类型：
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作者：
J. Gariel;R. Archuleta;M. Bouchon
我们使用一套特殊的强地面运动记录期间获得的最大的余震之一（ML = 5.0）的1979年帝王谷地震研究的时间历史上一公里大小的故障破裂。我们采用单裂隙、复合裂隙和位错地震模型来模拟震源，并计算记录场地的地面速度和加速度。最适合的数据是获得一个裂纹样的源，其中破裂是在一个边缘开始，并在故障循环扩展。推断的应力降为720巴，断裂区直径约1公里。断层呈垂直走向，走向N320°E。这个简单的模型令人惊讶地很好地解释了在事件期间在近源区域记录的地面速度和加速度的振幅和波形。
We use the exceptional set of strong ground motion records obtained during one of the largest aftershocks (ML = 5.0) of the 1979 Imperial Valley earthquake to study the time history of rupture on a kilometric size fault. We apply single crack, composite cracks, and dislocation earthquake models to simulate the source and calculate the ground velocity and acceleration at the recording sites. The best fit to the data is obtained for a crack-like source where rupture is initiated at one edge and expands circularly over the fault. The stress drop inferred is 720 bars, and the fractured area has a diameter of about 1 km. The fault is vertical and strikes in the N320°E direction. This simple model explains surprisingly well the amplitudes and waveforms of the ground velocities and accelerations recorded in the near-source region during the event.