云南地区4级地震频度异常特征与强震关系研究  

STUDY ON THE RELATION BETWEEN FREQUENCY ANOMALOUS CHARACTERISTICS OF M4.0 EARTHQUAKES AND STRONG EARTHQUAKES

作　　者：王兰兰[1] 刘丽芳[1] 

机构地区：[1]云南省地震局,云南昆明650041

出　　处：《内陆地震》2004年第4期359-364,共6页Inland Earthquake

基　　金：国家科技攻关96-913-09项目资助.

摘　　要：对云南地区18次MS≥6强震事件前中、小地震活动过程进行了分析,发现在这些地震发生前1—3年近场区2°×2°范围内4级地震频度基本上出现了显著增强现象,可以用4级地震年累计频度进行定量描述。通过全时空的扫描,确定年累计频度N≥4为异常阈值,该指标通过了置信度97.5%的R值内符检验。并用调整单元对强震附近4级地震活动增强现象给予了物理解释。By analyzing the course of small-medium earthquake activities for 18 earthquakes with M\-S≥6.0 in Yunnan region, We found that the frequency of M4.0 earthquakes in the range 2°×2? unit show obvious intensifying phenomena in the 1-3 years' near location before the earthquakes occured, so the M4.0 earthquakes frequency of yearly accumulation can use to describe the strong earthquakes. The whole time-space scanning result show 4 is the yearly accumulation frequency cutoff value, Using the R value to test it, found the success ratio is 97.5%. We used the adjusting unit to explain the phenomena that M4.0 earthquake frequency intensify on physics

关 键 词：6级地震 近场区 4级地震频度异常 云南 

分 类 号：P315.7[天文地球—地震学]