Seismicity changes prior to the MS 7.0 Lushan earthquake and the application of regional seismic activity parameter IRTL

被引：0
|
作者：
Liu Y. [1 ]
Lü X. [1 ]
Tian Q. [1 ]
机构：
[1] Key Laboratory of Earthquake Prediction China Earthquake Administration, Institute of Earthquake Science, China Earthquake Administration, Beijing
来源：
Earth Science Frontiers | 2017年 / 24卷 / 02期
关键词：
Lushan M[!sub]S[!/sub] 7.0 earthquake; Parameter of regional seismic activity; Region-Time-Length (RTL); Seismicity;
D O I：
10.13745/j.esf.2017.02.021
中图分类号：
学科分类号：
摘要：
An analysis of the characteristics of seismicity changes prior to the MS 7.0 Lushan earthquake which was under the influence of increased seismic activity caused by MS 8.0 Wenchuan earthquake was conducted and a new physical parameter IRTL was proposed to comprehensively evaluate the space-time changes of seismicity of a region. One year prior to the earthquake occurrence, seismic quiescence was detected in epicenter and surrounding areas. Anomalies mainly distributed in the southern segment of the Longmenshan thrust belt within the range of 1.5°N×2°E, which had lasted for nearly 8 months. The area of abnormal region and the degree of quiescence were changed from small to large and then to small again chronologically. The new parameter IRTL could evaluate regional seismicity anomalies in space and time. At early stage, IRTL fluctuated around zero, and then fall to the trough. Prior to the earthquake occurrence, IRTL went back to a small value again. Nine months after the trough, Lushan earthquake occurred. IRTL could provide some evidence to evaluate the risk of Lushan earthquake occurrence. This study may give better understanding of the seismogenic process of Lushan earthquake. © 2017, Editorial Office of Earth Science Frontiers. All right reserved.
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页码：220 / 226
页数：6
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