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Moderate Earthquakes Cluster before Lushan M7.0 Earthquake in Sichuan-Yunnan Region
Pages: 347-353
Year: Issue:  3
Journal: Journal of Seismological Research

Keyword:  Lushan M7.0 earthquakethe moderate earthquake clustersSichuan-Yunnan regionR-value;
Abstract: The temporal-spatial relationship between the 12 groups of M4.0 ~ 5.0 earthquake clusters and the following strong earthquakes in Sichuan and Yunnan region is researched.The main cognitions are showed as follows: The magnitude of the maximum earthquake and the following strong earthquake are not correlative in the moderate earthquake clusters and the time intervals of the corresponding earthquakes and the earthquake cluster are mostly in half a year.Taking the M4.0 ~ 5.0 earthquake clusters as the prediction abnormities in one year before M≥6.7 earthquakes,we obtain that the prediction efficiency R-value is 0.258 5.The strong earthquakes often occur in the concentrated areas of the earthquake clusters in Yunnan area,however they often occur in inactive areas of M4.0 ~ 5.0 earthquakes in Sichuan area.
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