Reliability of earthquake nucleation model in Koyna region

作     者：Rai, S. S. Sarma, Rajgopala 

作者机构：Natl Geophys Res Inst CSIR Hyderabad 500007 Andhra Pradesh India 

出 版 物：《CURRENT SCIENCE》 (Curr. Sci.)

年 卷 期：2013年第105卷第11期

页      面：1598-1604页

核心收录：

学科分类：07[理学] 08[工学] 

基　　金：J.C. Bose Fellowship from DST, New Delhi DST 

主　　题：Earthquake nucleation micro-earthquakes short-term prediction 

摘      要：We question the inferred downward nucleation of hypocentres that forms the basis for short-term earthquake prediction in the Koyna region. A careful relocation of foreshocks/aftershocks for a Mw 4.4 main shock sequence in 1996, hitherto believed to have occurred at 8 km depth, reveals that the main shock occurred at a depth of only 1.8 km, and formed part of a clear and almost instantaneous northward migration of micro-earthquakes along a narrow zone that could only be a fault plane at 4-8 km depth. This finding requires the current hypothesis for forecasting deep main shocks from shallow foreshocks in Koyna region to be discarded.