1997年玛尼7.5级地震前兆特征分析  

STUDY ON THE PRECURSORY CHARACTERISTICS OF MANI EARTHQUAKE WITH 7.5

作　　者：朱丽霞[1] 赵淑梅[1] 

机构地区：[1]青海省地震局,西宁810001

出　　处：《高原地震》1999年第4期9-14,共6页Plateau Earthquake Research

摘　　要：分析了 1 997年玛尼 7.5级地震的前兆特征 ,认为玛尼地震的发生具有一定的构造背景 ,它发生在中国大陆西部及邻区第 5个活跃幕 7级以上强震所构成的“大三角”分布的特定节点上。地震前存在着低 b值、缺震、频度、GL值等测震学异常以及水位、水温、地应力等水化学和地形变学异常。通过该地震前兆特征的追溯性分析 。The characteristics of temporal and spatial distribution of the precursory anomaly before Mani earthquake with Ms7.5 have been analyzed.And the spatial distribution of the strong earthquakes with Ms≥7.0 in China western continent and its neighboring area in the fifth strong earthquake episode has discussed in detail.Mani earthquake was occurred at a big background of equally spaced net,and this epicenter was just in Ms≥7.0 earthquake risk net.The obvious earthquake precursors were found:regional seismic swarm activity increased,b value became lower than before,GL≥1,etc..Several days to several months before Mani earthquake,some mediumshort precursors were found:water level in Urumqi,water temperature in Ge'ermu,stress in Delingha.Now,to rethink the precursory anomaly phenomona before Mani earthquake will be great significance for the earthquake prediction in the future.

关 键 词：地震预报 地震活动性 地震前兆异常 玛尼地震 

分 类 号：P315.72[天文地球—地震学]