逆断裂在浅部松散层中的破裂传播方式

根据实际资料分析研究，逆断裂破裂位错向上传播至松散层中有４种消减形式：端部分叉、从断裂向褶皱转换、破裂在松散层中的吸收与尖灭及逆断层前方碎砾物质的扰动变形等。端部分叉与扰动变形的消减可能与突发性位错相关；上覆层的褶皱及位错在松散层中的尖灭则多属弹－塑转换型的消减方式

THE MODE OF FRACTURE PROPAGTION OF REVERSE FAULT IN SHALLOW LOOSE DEPOSITS

The process of the upward propagation and extension of deep－seated reverse fault is an at-tractive research topic． Based on the analysis of practical data， it is found that there are fourtypes of the attenuated upward fracture propagation of reverse fault in shallow loose deposits．They are the branching of the terminal portion of the fault，the transformation of the fault intofold， the thinning out of the fault in loose deposits， and the disturbance and deformation of thedetrital materials ahead of the reverse fault． The branching of the terminal portion of the faultand the disturbance of detrital may be related to an abrupt seismic dislocation event，while theother two types can be attributed to attenuation in elastic－plastic transition regime