腾冲火山区及周围地区震源机制与构造应力场分布特征
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摘要
对腾冲火山区及周围地区强震震源深度和震源机制空间分布及区域现代构造应力场特征进行了研究。由我国西南地区直到缅甸中深源地震带的区域构造应力场空间分布格局，充分显示出我国西南地区在现代构造运动过程中，受到以印度板块对亚欧板块碰撞挤压作用为主要动力源，在东部同时受到太平洋板块和菲律宾海板块远距离作用影响的总体特征。腾冲火山区主要受到印度板块在缅甸中深源地震带产生的侧面挤压剪切的直接作用。腾冲火山区所属的腾冲龙陵地震带是西南地区区域构造应力场分区的一条重要边界。腾冲火山区主要受到北东———北东东向的区域压应力场作用，同时也可能受到东侧毗邻应力场分区南南东———南东向压应力场的影响。
The source mechanism and distribution characteristics of tectonic stress field in the area of Tengchong volcano and nearby have been studied in this paper. The spatial outiline of regional tectonic stress field in seismic zone with earthquakes in mid deep source from south of China to Myamar shows the features that the collision function between India plate and Euasia plate is the major force source, and the distant function is from Pacific plate and Philippine sea plate, in the process of modern tectonic movement. The area of Tengchong volcano is controlled under the direct function from lateral compression shearing caused by India plate in mid deep seismic zone of Myamar. The Tengchong Longling seismic zone belonging to the volcano area is an important border which is used to divide tectonic stress field in south west China. Tengchong volcano area is functioned by regional compression stress field in NE NEE, meanwhile, possibly from the direction of SSE SE nearby.
The source mechanism and distribution characteristics of tectonic stress field in the area of Tengchong volcano and nearby have been studied in this paper. The spatial outiline of regional tectonic stress field in seismic zone with earthquakes in mid deep source from south of China to Myamar shows the features that the collision function between India plate and Euasia plate is the major force source, and the distant function is from Pacific plate and Philippine sea plate, in the process of modern tectonic movement. The area of Tengchong volcano is controlled under the direct function from lateral compression shearing caused by India plate in mid deep seismic zone of Myamar. The Tengchong Longling seismic zone belonging to the volcano area is an important border which is used to divide tectonic stress field in south west China. Tengchong volcano area is functioned by regional compression stress field in NE NEE, meanwhile, possibly from the direction of SSE SE nearby.
引文
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