防灾减灾学报
防災減災學報
방재감재학보
JOURNAL OF DISASTER PREVENTION AND REDUCTION
2012年
1期
37-41
,共5页
震群%震源机制%海城-岫岩地区
震群%震源機製%海城-岫巖地區
진군%진원궤제%해성-수암지구
earthquake swarms%local mechanism%Haicheng-Xiuyan area
海城-岫岩地区是辽宁省小震、震群多发地区。本文选用1975年以来具有一定发震规模,且仪器记录相对较完整的3个显著震群(1975年海城7.3级,1999年岫岩5.4级和2008年海城ML4.8级地震),将其较大地震前ML≥4.0级地震震源机制结果进行比较,发现海城7.3级和岫岩5.4级地震前ML≥4.0级地震震源机制解与主震有较好的一致性,而2008年11月海城4.8级地震前ML≥4.0级地震震源机制一致性较差。我们对能否借鉴前震震源机制一致性的差异快速判断中强震发展的趋势,进行了探讨和研究。
海城-岫巖地區是遼寧省小震、震群多髮地區。本文選用1975年以來具有一定髮震規模,且儀器記錄相對較完整的3箇顯著震群(1975年海城7.3級,1999年岫巖5.4級和2008年海城ML4.8級地震),將其較大地震前ML≥4.0級地震震源機製結果進行比較,髮現海城7.3級和岫巖5.4級地震前ML≥4.0級地震震源機製解與主震有較好的一緻性,而2008年11月海城4.8級地震前ML≥4.0級地震震源機製一緻性較差。我們對能否藉鑒前震震源機製一緻性的差異快速判斷中彊震髮展的趨勢,進行瞭探討和研究。
해성-수암지구시요녕성소진、진군다발지구。본문선용1975년이래구유일정발진규모,차의기기록상대교완정적3개현저진군(1975년해성7.3급,1999년수암5.4급화2008년해성ML4.8급지진),장기교대지진전ML≥4.0급지진진원궤제결과진행비교,발현해성7.3급화수암5.4급지진전ML≥4.0급지진진원궤제해여주진유교호적일치성,이2008년11월해성4.8급지진전ML≥4.0급지진진원궤제일치성교차。아문대능부차감전진진원궤제일치성적차이쾌속판단중강진발전적추세,진행료탐토화연구。
Haicheng-Xiuyan area is an earthquake fluently-happened region in Liaoning Province.We selected 3 large scale earthquake swarms with complete instrumental records since 1975,which are Haicheng 7.3 magnitude earthquake in 1975,Xiuyan 5.4 magnitude earthquake in 1999 and Haicheng ML4.8 earthquake in 2008.We compared the focal mechanism of ML≥4.0 earthquakes before each main shock and found that the consistency between them is significant in Haicheng 7.3 magnitude earthquake and Xiuyan 5.4 magnitude earthquake but not in Haicheng ML4.8 earthquake.Then we researched the rapid determination of development of earthquakes by means of former earthquake focal mechanism consistency.