地核反射之剪力波触发余震：以四川地震为例
- 出版年：2010
- 作者：Cheng-Horng Lin（林正洪）；Wen-Yen Chang
- 单位1：Institute of Earth Sciences
- 语种：中文
- 起始页：30
- 总页数：1
- 刊名：国际地震动态
- 是否内版：否
- 刊频：月刊
- 创刊时间：1971
- 主管单位：中国科学技术协会
- 主办单位：中国地震学会；中国地震局地球物理研究所
- 主编：许绍燮
- 地址：北京市海淀区民族大学南路5号
- 邮编：100081
- 电子信箱：rdws@cea-igp.ac.cn
- 网址：http://www.gjdzdt.org.cn
- 期：6
- 期刊索取号：P263.06 627-3
- 数据库收录：中国核心期刊（遴选）数据库收录期刊；中国学术期刊综合评价数据库统计源期刊；中国期刊全文数据库（CJFD）全文收录期刊；中文科技期刊数据库原文收录期刊
- 核心期刊：中国核心期刊（遴选）数据库收录期刊
摘要
Since the Earth outer core is liquid, the shear waves that are generated by alarge earthquake and traveling to the core (ScS) will totally reflect with strong seismic ener-gy. It is interesting to note that one large aftershock (Mw = 6. 0) of the 2008 Sichuan earth-quake (Mw = 7. 9) in China just occurred when the ScS phase returned around 15. 5 minuteslater after the mainshock occurred. The estimated peak dynamic stress (～3. 3 kPa) of theScS amplitude was reaching to the generally lower bound for capable of triggering earth-quakes. Both the temporal correlation between the aftershock occurrence and the ScS arrivalas well as the large enough dynamic stress suggest that the largest aftershock might be trig-gered dynamically by the ScS waves. Further statistic examinations of 24 major earthquakes(Mw>7. 5) since 2000 show some large aftershocks (Mw>5. 0) also coincidentally occurredaround the ScS phase arrived. Those observations imply that aftershocks might likely betriggered dynamically by the ScS phases, and thus a temporal warning for potentially de-structive aftershocks might be considered in the future great earthquakes.