【摘要】 利用云南省地震台网的宽频带数据,采用CAP方法计算了2013年3月3日洱源MS5.5地震前后共10次ML≥3.4地震的震源机制解,分析了洱源MS5.5地震前后震源机制解的一致性变化特征,结合精定位结果、震后现场灾害评估报告及震区地质构造情况,判定维西—巍山断裂以西的苍山西麓炼铁盆地东缘主边界断裂带为洱源MS5.5地震的发震构造,震源机制解节面Ⅱ(走向160°、倾角48°、滑动解-99°)为其发震断层面。更多还原

【Abstract】 Using the broadband data recorded by Yunnan Seismic Network,we calculated the focal mechanism solutions of 10 ML≥3. 4 earthquakes before and after Eryuan MS5. 5 earthquake on M ar. 3,2013 by CAP( cut and paste) algorithm,and analyzed the consistency viaration characteristics of the focal mechanism solutions of the study earthquakes. Combined with the precision positioning results,the site disaster assessment report after the earthquake and the geological structure in seismic area,we concluded that the seismogenic structure of Eryuan MS5. 5 earthquake was the main boundary fault zone of the east boundary of the Liantie basin in the west of Cangshan to the west of the Weixi-Weishan Fault. The focal mechanism solution of the nodal surface Ⅱ,whose strike is 160°,the dip is 48° and the slip is- 99° is the seismogenic fault plane.更多还原