摘要
利用１２０次地震震源机制解资料，分析了巴士系断裂带构造应力场的基本特征。结果表明，该断裂带应力场的总体特征为ＮＷ～ＮＷＷ向，但不同地段略有差异。由北西至南东主压应力Ｐ轴方向由ＮＷＷ～ＮＷ～ＮＷＷ（近ＥＷ）向，Ｐ轴相对平缓，地震以走滑错动为主，兼具倾滑分量，应力场的变化与菲律宾海板块对欧亚板块的不均匀推挤作用有关。
The basic characteristics of regional stress field have been analyzed in Bashi System structure zone whose striking is NW using the data of focal mechanism solutions of 120 earthquakes.The total characteristic is found that the direction of regional stress field is from NW to NWW in this area, but there is difference in its three segments,that is the direction of pressure stress P axis in each segment is NWW,NW and NWW respectively. Paxis is nearly horizontal and the disturbance is maily strike slip with relatively small dip motion component. The variation of stress field is related to the uneven push of Philippine sea plate to Eurasia plate along the direction of NW.
出处
《华南地震》
1998年第1期119-124,共6页
South China Journal of Seismology
关键词
构造应力场
震源机制
巴士系构造
华南地震区
Tectonic stress field,Focal mechanism,Bashi system structure, seismic area of South China
