地震研究

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M_max=-0.44+1.03M_b±0.4; 最大后续余震法M_max=-0.23+1.00M_m±0.4; 主震震级估算最大余震法M_max=-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,M_max=M-1.2,在6.0～7.9级之间,M_max=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。

Basing on the 181 earthquake sequences in Yunnan region from 1965 to 2012,we respectively obtained four relation formulas between the main shock and the largest aftershock by four methods:M_max=-0.44+1.03M_b ± 0.4 in the b-value intercept method,M_max=-0.23+1.00M_m ± 0.4 in the maximum subsequent aftershocks method,M_max=-0.71+0.89M±0.4 in the maximum aftershock estimated by main shock magnitude method,and M_max=M-1.2 for M5.0～5.9 main shock,M_max=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 well. The statistic results showed that the proportion of maximum aftershocks occurred in the first three days after the main shock up to 60%,which may provide the basis for the time judgment of the maximum aftershock.

引言
1 资料
2 云南最大余震的估算
3 实例检验〖*4〗3.1 2009年7月9日姚安6.0级地震序列
4 结论与讨论

图1 1965～2012年云南地区地震序列空间分布<br/>Fig.1 Spatial distribution of the earthquake sequence in Yunnan from 1965 to 2012

图1 1965～2012年云南地区地震序列空间分布
Fig.1 Spatial distribution of the earthquake sequence in Yunnan from 1965 to 2012

图2 b值截距法计算的Mb-Mmax<br/>Fig.2 Mb-Mmax calculated by b value intercept method

图2 b值截距法计算的Mb-Mmax
Fig.2 Mb-Mmax calculated by b value intercept method

图3 最大后续余震法计算的Mm-Mmax<br/>Fig.3 Mm-Mmax calculated by the most subsequent aftershocks method

图3 最大后续余震法计算的Mm-Mmax
Fig.3 Mm-Mmax calculated by the most subsequent aftershocks method

图4 主震震级和实际最大余震震级的关系<br/>Fig.4 The relationship between main shock magnitude and the actual maximum aftershock magnitude

图4 主震震级和实际最大余震震级的关系
Fig.4 The relationship between main shock magnitude and the actual maximum aftershock magnitude

图5 主震震级在5.0～5.9范围(a)、6.0级以上范围(b)与震级差的关系<br/>((a-1)、(b-1)为M与ΔM关系;(a-2)、(b-2)为ΔM统计)<br/>Fig.5 The relationship between M5.0～5.9(a)and M≥6.0(b)main earthquakes and magnitude difference((a-1)、(b-1)is the relationship of M and ΔM;(a-2)、(b-2)is the statistic of ΔM)

图5 主震震级在5.0～5.9范围(a)、6.0级以上范围(b)与震级差的关系
((a-1)、(b-1)为M与ΔM关系;(a-2)、(b-2)为ΔM统计)
Fig.5 The relationship between M5.0～5.9(a)and M≥6.0(b)main earthquakes and magnitude difference((a-1)、(b-1)is the relationship of M and ΔM;(a-2)、(b-2)is the statistic of ΔM)

图6 最大余震发生时间分布<br/>Fig.6 Occurance time distribution of the largest aftershocks

图6 最大余震发生时间分布
Fig.6 Occurance time distribution of the largest aftershocks

图7 不同类型最大余震发生时间分布<br/>(a)主余型地震;(b)双震型地震<br/>Fig.7 Occurance time distribution of different types of the largest aftershocks(a)mainshock-aftershock type;(b)double earthquake type

图7 不同类型最大余震发生时间分布
(a)主余型地震;(b)双震型地震
Fig.7 Occurance time distribution of different types of the largest aftershocks(a)mainshock-aftershock type;(b)double earthquake type

图8 G-R关系(震后一个月)<br/>Fig.8 G-R relationship(one month after the earthquake)

图8 G-R关系(震后一个月)
Fig.8 G-R relationship(one month after the earthquake)

图9 震级与发震次数关系<br/>(a)2009年7月9日姚安6.0级地震;(b)2012年9月7日彝良5.6级地震<br/>Fig.9 The relationship between magnitude and earthquake frequency(a)Yao'an M6.0 earthquake on Jul.9,2009;(b)Yiliang M5.6 earthquake on Sep.7,2012

图9 震级与发震次数关系
(a)2009年7月9日姚安6.0级地震;(b)2012年9月7日彝良5.6级地震
Fig.9 The relationship between magnitude and earthquake frequency(a)Yao'an M6.0 earthquake on Jul.9,2009;(b)Yiliang M5.6 earthquake on Sep.7,2012

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备注

引言

1 资料

2 云南最大余震的估算

3 实例检验〖*4〗3.1 2009年7月9日姚安6.0级地震序列

4 结论与讨论

期刊信息