摘要
青藏高原走滑型地震断裂共轭角的分布范围约为 5 0°～ 110°,总的趋势是随着与喜马拉雅驱动边界距离的增大而减小 ,并具有波状起伏的特征 ,反映多震层内应变随距离的变化。该层共轭角的波状起伏与岩石圈下层的应变起伏相互对应 ,前者滞后于后者 ,表明上层共轭角的变化主要受控于下层应变的波动传播。
The conjugate angles of strike-slip seismic faults range from about 50° up to 110° in the Qinghai-Tibet plateau and, generally, tend to decrease and undulate with the increase of the distance from the Himalayan driving boundary, which principally show the variation of strain versus distance in the seismogenic layer. The undulation of conjugate angle values in the seismogenic layer corresponds, with some delay, to that of strains in the lower lithosphere, indicating the variation of the conjugate angles in the upper layer to be controlled mainly by the propagation of strain waves in the lower layer. The study of the distribution of conjugate angles of seismic faults is expected to provide a new approach to the estimation of strain field in the seismogenic layer.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2004年第4期475-481,共7页
Acta Geologica Sinica
基金
国家自然科学基金项目 (编号 4983 40 0 2 )
地震科学联合基金课题 (编号 1990 61)资助成果
关键词
地震断裂
地震线
共轭角
塑性流动网络
应变场
青藏高原
Qinghai-Tibet plateau
seismic fault
earthquake line
conjugate angle
plastic-flow network
strain field
