摘要
简述了苍山ＭＳ５．２地震的基本概况，分析了苍山５２级地震构造背景，据这次地震的余震空间分布、等震线长轴、震源机制解、地震活动条带和地质资料分析认为北西向的苍山新泰断裂和北东向的荣成临沂断裂可能是苍山５２级地震的地震断层。在１９８５年６月以前，鲁南地区的地震活动呈随机分布，１９８５年６月以后ＭＬ≥３．０地震主要集中在新泰苍山莒县之间的三角地带，来回迁移；１９７４年以后沿苍山尼山断裂的ＭＬ≥３．０地震都发生在５２级地震震中附近，说明在苍山尼山断裂与沂沭断裂带交汇区西侧较长时间的能量积蓄。苍山５２级地震前最后发生的两个ＭＬ≥２．０地震与苍山５２级地震震中形成沿地震断层的临震小震活动条带。
Main case of Cangshan earthquake of M S 5.2 is reviewed. The structrue background of the earthquake is analysed. Based on analysis for aftershock space distrubution, the long axis of isoseismic, focal mechnism resolution, seismicity strip and geological data, it is considered that the Cangshan Xintain fracture of NW and Rongcheng Lingyi fracture of NE can be seismic fault of Cangshan earthquake of M S 5.2. Before Jun. 1995, the seismicity of south Shandong region is random distrubution. After Jun. 1985 M L≥3.0 earthquakes mainly concentred in the triangle area of Xintain, Cangshan Ju counties, the epicentres had went back and there. After 1974 M L≥3 earthquakes occurred along Cangshan Nishan fracture, near which occurred Cangshan earthquake of M S 5.2, which indicts that energy accumulated for a long time in the west side of cross of Cangshan Nishan and Yishu fractrues.
出处
《地震学刊》
CSCD
1998年第3期7-12,共6页
Journal of Seismology
关键词
苍山
地震
地震断层
构造活动
地震前兆
Cangshan earthquake Seismic fault Precursor structural action
