云南省M_S≥6.0地震序列的基本特征  

BASIC CHARACTERISTICS OF M_S≥6.0 EARTHQUAKE SEQUENCES IN YUNNAN

作　　者：刘丽芳[1] 苏有锦[1] 付虹[1] 李永莉[1] 蔡静观[1] 

机构地区：[1]云南省地震局,云南昆明650041

出　　处：《内陆地震》2002年第1期62-68,共7页Inland Earthquake

摘　　要：选取了云南省 196 5— 2 0 0 0年的 19个 MS≥ 6 .0地震序列 ,利用震后 30天的余震资料 ,分析了各地震序列的震级结构。运用古登堡—里克特关系式及大森—宇津公式分别计算了各余震序列的 b值和 p值。结果表明 ,云南省每一次 7级或 6级地震发生后 ,均有大量余震发生 ,但余震活动的强度和频度在各序列之间存在较大差异 ,其原因可能与震源区的介质、构造差异有关。计算得到的 b值为0 .38— 0 .70 ,b值的大小体现出了一定的区域特征 ;p值大多接近或大于 1.0 ,但看不出区域特征。在主震—余震型和双主震—余震型地震序列之间 ,b值。In order to study the characteristics of earthquake sequences, 19 M\-S≥6.0 earthquake in Yunnan in 1965-2000 are selected. The magnitude-frequency distribution of each seismic sequence is analyzed with aftershock data in 30 days after the earthquake, and the values of b and p of each sequence are calculated using Gutenberg-Richter Relation and Magi's law. The study indicates that in Yunnan there must be a large number of aftershocks following a M\-S≥7.0 or M\-S≥6.0 earthquake. However, for different sequences the intensity and frequency of aftershocks is much different, which may be relative with the medium and structures of epicentral areas. By calculation, value b is 0.38-0.70, and it has different features in different areas; most p's are nearing or over 1.0, and there isn't regional feature shown. Between mainshock-aftershock type and double mainshock-aftershock type sequences, there is no obvious difference of value b and value p.

关 键 词：B值 P值 地震序列 云南 余震 震级 

分 类 号：P315.3[天文地球—地震学]