Low detection capability of global earthquakes after the occurrence of large earthquakes: investigation of the Harvard CMT catalogue
Low detection capability of global earthquakes after the occurrence of large earthquakes: investigation of the Harvard CMT catalogue
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DOI：
10.1111/j.1365-246x.2008.03864.x
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发表时间：
2008-09-01
影响因子：
2.8
通讯作者：
Iwata, Takaki
中科院分区：
文献类型：
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作者：
Iwata, Takaki
我们调查了大地震发生后全球地震的探测能力。我们将从哈佛质心矩张量目录获得的大地震发生后的全球地震序列进行叠加，并将表示观测到的地震震级频率分布的统计模型应用于叠加序列。模型参数的时间变化（对应于地震的检测能力）是使用贝叶斯方法估计的。我们发现，大地震发生后的几个小时内，全球地震的探测能力低于正常水平；例如，7级或以上地震发生后，全球地震探测能力下降的持续时间估计约为12小时。
We investigated the detection capability of global earthquakes immediately after the occurrence of a large earthquake. We stacked global earthquake sequences after occurrences of large earthquakes obtained from the Harvard centroid-moment tensor catalogue, and applied a statistical model that represents an observed magnitude-frequency distribution of earthquakes to the stacked sequence. The temporal variation in model parameters, which corresponds to the detection capability of earthquakes, was estimated using a Bayesian approach. We found that the detection capability of global earthquakes is lower than normal for several hours after the occurrence of large earthquakes; for instance, the duration of lowered detection capability of global earthquakes after the occurrence of an earthquake with a magnitude of seven or larger is estimated to be approximately 12 hr.