欧亚地震带现代构造应力场及其分区特征  

Recent Tectonic Stress Field of Eurasian Earthquake Zone and the Characteristics of Its Subareas

作　　者：赵小艳[1] 苏有锦[1] 付虹[1] 邬成栋[1] 

机构地区：[1]云南省地震局,昆明650224

出　　处：《地震研究》2007年第2期146-151,共6页Journal of Seismological Research

基　　金：云南省地震局青年基金(200608);国家科技支撑计划(2006BACo1B03-04-01)资助

摘　　要：利用美国哈佛大学矩心矩张量目录中的2818个地震的震源机制解资料,分析了欧亚地震带及其5个分区现代构造应力场的基本特征,给出了5个分区的震源机制主压应力方向分布图。结果表明:①欧亚地震带以逆断型和走滑型断层活动为主;②地中海地震区以走滑断层活动为主,主压应力方向为SSW向;③伊朗—阿富汗—巴基斯坦地震区以逆断型断层活动为主,主压应力优势方向为NNE—NS向;④喜马拉雅地震以逆断型为主,主压应力优势方向为NS和NE向;⑤川—滇—缅地震区以走滑断层活动为主,主应力场方向为NNE向;⑥印度尼西亚地震区以逆断型断层活动为主,主压应力优势方向为NE—SSW向。各分区的主压应力方向明显受其所在区域板块运动的影响,由此推测板块运动可能是产生欧亚地震带构造应力的主要力源。According to＇ the focal mechanism solutions of 2 818 earthquakes from the Harvard CMT catalogue, we analyze the basic characteristics of the tectonic stress fields in the Eurasian earthquake zone and its five subareas, and compile the tectonic stress maps for the five subareas. The results indicate： （ 1 ） most earthquakes in the Eurasian zone have thrust faulting and strike-slip faulting mechanisms; （2） in the Mediterranean area, the focal mechanisms are mainly strike-slip faulting, the principal compressive stress are mostly in SSW direction; （3） in the Iran- Afghanistan-Paldstan area, the focal mechanisms are mainly thrust faulting, the principal compressive stress are usually in NNE-NS direction; （4） in the Himalaya region, the focal mechanisms are also thrust faulting, the principal compressive stress are mostly in NE and NS directions; （5） in the Sichuan-Yunnan-Burma area, the focal mechanisms are mainly strikeslip faulting, the principal compressive stress are mostly in NNE direction; （6） in Indonesia, the focal mechanisms are mainly thrust faulting, the principal compressive stress are mostly in NE-SSW direction. Because the orientations of the principal compressive stresses are obvious effected by the plate movement, it is inferred that the plate movement may be the primary force source of the tectonic stress field in the Eurasian zone.

关 键 词：震源机制解 构造应力场 欧亚地震带 

分 类 号：P315.2[天文地球—地震学]