Signature of Fault Healing in an Aftershock Sequence? The 2008 Wenchuan Earthquake
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- 作者：Shengfeng Zhang ; Zhongliang Wu ; Changsheng Jiang
- 关键词：Aftershock sequence ; fault healing ; b value ; the 2008 Wenchuan earthquake
- 刊名：Pure and Applied Geophysics
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：173
- 期：1
- 页码：73-84
- 全文大小：4,239 KB
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Zhongliang Wu (1)
Changsheng Jiang (1)
1. Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China - 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Geophysics and Geodesy - 出版者：Birkh盲user Basel
- ISSN：1420-9136
文摘
We analyzed the aftershock sequence of the 2008 Wenchuan earthquake from May 12, 2008 to May 12, 2013 using the earthquake catalog of the China Earthquake Networks Center (CENC). In the analysis performed, we took under consideration the temporary variation in the completeness of the earthquake catalog just after the Wenchuan mainshock. The cutoff completeness magnitude from May 12 to June 27, 2008 was above 3.0 due to the impact of the earthquake sequence on the seismological observatory practice. It was observed that the b value has an increasing trend from June 27, 2008 to late April 2009, while since May 2009, the b value has remained stable. If these characteristics were associated with the possible signature of fault healing, the ‘apparent healing time’ could be pinpointed by this measure as around 1 year. Due to two strong asperities present on the rupture of the Wenchuan mainshock, the aftershock zone can be divided into two segments, namely the north and the south segment. The b values of the two segments seem to show different trends of temporal variation. The main contribution of the increasing trend comes from the south segment, or the ‘initiation segment’ of the main rupture.