【摘要】 利用1965~2012年云南地区的181次地震序列资料,分别用4种不同的方法得到主震和最大余震的震级关系式分别为:b值截距法Mmax=-0.44+1.03Mb±0.4;最大后续余震法Mmax=-0.23+1.00Mm±0.4;主震震级估算最大余震法Mmax=-0.71+0.89M±0.4;主震与最大余震震级差法:主震震级在5.0~5.9级之间,Mmax=M-1.2,在6.0~7.9级之间,Mmax=M-1.0。用这4种方法对2009年7月9日姚安6.0级地震和2012年9月7日彝良5.6、5.7级地震序列中的最大强余震进行估算,结果符合较好。统计结果显示最大强余震发生在主震后前3天的比例高达60%,这一结果可为最大强余震的时间判定提供依据。更多还原

【Abstract】 Basing on the 181 earthquake sequences in Yunnan region from 1965 to 2012,w e respectively obtained four relation formulas betw een the main shock and the largest aftershock by four methods: Mmax=- 0. 44 + 1. 03Mb ± 0. 4 in the b-value intercept method,Mmax=- 0. 23 + 1. 00Mm± 0. 4 in the maximum subsequent aftershocks method,Mmax=- 0. 71 + 0. 89M ± 0. 4 in the maximum aftershock estimated by main shock magnitude method, and Mmax= M- 1. 2 for M5. 0 ~ 5. 9 main shock,Mmax= M- 1. 0 for M6. 0 ~ 7. 9 main shock in the magnitude difference of main shock and aftershock method. We estimated the maximum magnitude of aftershock sequences of Yaoan M6. 0 earthquake on Jul. 9,2009 and Yiliang M5. 6,5. 7 earthquakes on Sep. 7,2012 by four methods and obtained that the theory and actual maximum magnitudes of aftershock sequences agreed w ell. The statistic results show ed that the proportion of maximum aftershocks occurred in the first three days after the main shock up to 60%,w hich may provide the basis for the time judgment of the maximum aftershock.更多还原