Inslab earthquakes of Central Mexico: Peak ground-motion parameters and response spectra
Inslab earthquakes of Central Mexico: Peak ground-motion parameters and response spectra
复制标题
墨西哥中部的板状地震：峰值地面运动参数和响应谱
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Pacheco
中科院分区：
文献类型：
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作者：
D. García;S. K. Singh;M. Herraiz;M. Ordaz;J. Pacheco
我们开发的方程来预测伪加速度反应谱（5%阻尼），峰值地面加速度，峰值地面速度在自由场岩石网站的中间深度，正常断层inslab地震墨西哥中部。该数据集包括16个地震（5.2 ≤ MW ≤ 7.4; 35 ≤ H ≤ 138 km），记录在当地和区域距离（R ≤ 400 km）。它代表了一个关于构造体制、断层机制和土壤类别的同质目录。我们的研究结果表明，在震中区从板内事件比从板间事件，在前一种类型的地震更高的应力下降的结果更大的振幅。从中等到大（MW>6.0）板内地震的峰值地面加速度明显超过了具有类似震级的板间地震，最大地震的峰值地面加速度几乎达到3倍。然而，由于板内事件的地面运动，衰减速度比推力事件。我们的研究结果与其他基于日本和全球数据的研究结果基本一致。
We developed equations to predict pseudoacceleration response spectra (5% damping), peak ground acceleration, and peak ground velocity at free-field rock sites for intermediate-depth, normal-faulting inslab earthquakes of Central Mexico. The data set comprises 16 earthquakes (5.2 ≤ M w ≤ 7.4; 35 ≤ H ≤ 138 km) recorded at local and regional distances ( R ≤ 400 km). It represents a homogeneous catalog with respect to tectonic regime, fault mechanism, and soil class. Our results show larger amplitudes in the epicentral area from inslab events than from interplate events, a consequence of higher stress drops during the former type of earthquakes. Peak ground accelerations from moderate to large ( M w >6.0) inslab events significantly exceed those from interplate events with similar magnitude, reaching almost three times for the largest events. The ground motion due to inslab events, however, decays faster than for the thrust events. Our results are in reasonable agreement with other studies based on Japanese and the worldwide data.