Single station CMT; Application to the Michoacan, Mexico, Earthquake of September 19, 1985
Single station CMT; Application to the Michoacan, Mexico, Earthquake of September 19, 1985
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单站CMT；
DOI：
10.1029/gl013i003p00173
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发表时间：
1986
影响因子：
5.2
通讯作者：
J. Steim
中科院分区：
文献类型：
--
作者：
G. Ekström;A. Dziewoński;J. Steim
对地震后地球表面单点三维地面运动的观测足以确定该事件的零阶矩张量。我们将质心矩张量（CMT）方法[Dziewonski et al.， 1981]应用于单站数据分析，并将其应用于1985年9月19日Michoacan地震。所获得的机制表明断裂在一个浅平面上，与Cocos板块的持续俯冲相一致。标量矩为1.3 × 1028达因-厘米。观测到的纵波序列的直接反卷积表明，力矩释放发生在两个子事件中，每个子事件持续20秒，峰与峰之间的分离时间为25秒。
Observations of three-dimensional ground motion at a single point on the surface of the Earth following an earthquake can be sufficient to determine the zeroth order moment tensor of the event. We adapt the centroid-moment tensor (CMT) method [Dziewonski et al., 1981] of analysis to single station data and apply it to the September 19, 1985 Michoacan earthquake. The obtained mechanism indicates faulting on a shallow plane, consistent with the ongoing subduction of the Cocos plate. The scalar moment is 1.3 × 1028 dyne-cm. A direct deconvolution of the observed P-wave train indicates that the moment release occurred in two subevents, each of 20 seconds duration with a peak-to-peak separation in time of 25 seconds.