张北6.2级地震前断层活动特征研究  

Study on Fault Activity before Zhangbei Ms6.2 Earthquake Using Shanxi Mobile Cross-fault Short-level Data

作　　者：彭丽娟 陆明勇[2] 王秀文[3] 

机构地区：[1]山西省大同中心地震台,大同037008 [2]中国地震应急搜救中心,北京100049 [3]山西省地震局,太原030021

出　　处：《华北地震科学》2012年第1期54-58,共5页North China Earthquake Sciences

基　　金：中国地震局监测预报司项目"首都圈地区跨断层流动形变监测场地技术评价与观测资料映震效能及监测网优化研究"

摘　　要：运用变化率分析了张北6.2级地震前山西地区跨断层流动短水准资料变化特征,发现:在张北6.2级地震孕育过程中,特别是地震孕育中短期阶段,断层活动存在明显的异常变化且一致性好,主要表现为:①断层异常活动集中在震前3.5～0.5年且存在阶段性,断层异常恢复后发生地震;②断层异常活动性质发生剧烈快速的变化,离地震发生越近断层异常活动幅度越大、变化率越快;③山西地区跨断层流动水准异常特别是前中短期异常变化主要集中在山西带的北部地区,范围主要集中在震中周围500km左右范围内。In this paper, the mobile cross-fault short level data before Zhangbei 6.2 earthquake in Shanxi Province is analyzed; the results indicate that there are obvious fault activity anomalies during the prepara- tion period of Zhangbei 6.2 earthquake, especially in the medium and short term period of the earthquake preparation. These anomalies are consistent with each other and have following characteristics. （1） The fault activity anomalies are concentrated in 0.5-3.5 years just before the earthquakes. （2）The amplitude of the anomalies become bigger as the origin time comes near. （3）Shanxi abnormal cross-fault current lev- els, especially in the short-term anomalies before earthquakes mainly concentrated in Shanxi Province with the northern region, mainly in the range of about 500kin range around the epicenter.

关 键 词：跨断层流动短水准 张北地震 断层异常活动特征 

分 类 号：P315.72[天文地球—地震学]