Earthquake clustering in modern seismicity and its relationship with strong historical earthquakes around Beijing, China
Earthquake clustering in modern seismicity and its relationship with strong historical earthquakes around Beijing, China
复制标题
现代地震活动中的地震聚集及其与北京周边历史强震的关系
DOI:
10.1093/gji/ggx326
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发表时间:
2017
影响因子:
2.8
通讯作者:
Wang J
中科院分区:
文献类型:
--
作者:
Wang J
Beijing, China's capital city, is located in a typical intraplate seismic belt, with relatively high-quality instrumental catalogue data available since 1970. The Chinese historical earthquake catalogue contains six strong historical earthquakes ofMs≥ 6 around Beijing, the earliest in 294 AD. This poses a significant potential hazard to one of the most densely populated and economically active parts of China. In some intraplate areas, persistent clusters of events associated with historical events can occur over centuries, for example, the ongoing sequence in the New Madrid zone of the eastern US. Here we will examine the evidence for such persistent clusters around Beijing. We introduce a metric known as the ‘seismic density index’ that quantifies the degree of clustering of seismic energy release. For a given map location, this multi-dimensional index depends on the number of events, their magnitudes, and the distances to the locations of the surrounding population of earthquakes. We apply the index to modern instrumental catalogue data between 1970 and 2014, and identify six clear candidate zones. We then compare these locations to earthquake epicentre and seismic intensity data for the six largest historical earthquakes. Each candidate zone contains one of the six historical events, and the location of peak intensity is within 5 km or so of the reported epicentre in five of these cases. In one case—the greatMs8 earthquake of 1679—the peak is closer to the area of strongest shaking (Intensity XI or more) than the reported epicentre. The present-day event rates are similar to those predicted by the modified Omori law but there is no evidence of ongoing decay in event rates. Accordingly, the index is more likely to be picking out the location of persistent weaknesses in the lithosphere. Our results imply zones of high seismic density index could be used in principle to indicate the location of unrecorded historical of palaeoseismic events, in China and elsewhere.
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影响因子:
1
作者:
Jian Wang
通讯作者:
Jian Wang
DOI:
--
发表时间:
1994
期刊:
影响因子:
--
作者:
S. Wiemer;M. Wyss
通讯作者:
M. Wyss
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Javad Moradpour;S. Hainzl;J. Davidsen
通讯作者:
J. Davidsen
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
Qiong Zhang;P. Shearer
通讯作者:
P. Shearer
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
R. Castro;P. Shearer;L. Astiz;M. Suter;C. Jacques;F. Vernon
通讯作者:
F. Vernon