腾冲火山区小震震源机制特征  

Focal Mechanism Features of Small Shocks in the Tengchong Volcanic Area

作　　者：姜朝松[1] 王绍晋[1] 叶建庆[1] 赵慈平[1] 虎雄林[1] 

机构地区：[1]云南省地震局,昆明650041

出　　处：《地震研究》2005年第2期141-143,共3页Journal of Seismological Research

基　　金：科技部社会公益研究专项(2002D1A2009-11);云南省"十五"重点项目--腾冲火山活动监测及对策研究.

摘　　要：2002年6～9月,一个由15台流动数字地震仪组成的布设在腾冲火山区的临时地震监测台网,记录到了16个发生在近代火山活动十分活跃的马鞍山火山至热海地区内的小震。求其震源机制解,发现其中绝大多数地震的破裂面具有以水平走滑为主的破裂特征,个别地震破裂面则具有较大的倾滑分量。这表明了腾冲火山区地震震源机制解的多样性及地震破裂方式的复杂性。A temporary seismic monitoring network composed of 15 mobile digital seismographs was set up in the Tengchong volcanic area in June-Sept. of 2002. The network recorded 16 small shocks occurred in a area from Maanshan Volcano to Rehai where recent volcanic activity is very active. Through computing their focal mechanism solutions it is found that most rupture planes show horizontal strike-slip feature but one or two show obvious dip-slip feature, which indicates the diversification of the focal mechanism solutions and the complexity of earthquake rupture patterns.

关 键 词：小震 震源机制 破裂面 水平走滑 腾冲火山区 

分 类 号：P315.2[天文地球—地震学]