摘要
本文用浅层地震反射波法对可能穿越昆明新城区东部第四系覆盖区的白邑-横冲断裂南段进行了探测,结果表明:采用浅层地震反射波法探测隐伏断层是有效的,在滇池盆地东缘,白邑-横冲断裂南段东支在隐伏区存在,断面接近直立,视倾角约80°,具有高倾角张性正断性质,基岩垂直错距为10—13m,断裂规模由北向南减小;同时,没有发现西支次级断层存在迹象。据土层测龄结果,东支断裂最新活动时代为第四纪中更新世晚期。
The shallow seismic reflection exploration is applied to explore the buried southern segment of Baiyi-Henchong fault which is located in the east of New City of Kunming.The exploration reveals that the fault plane is nearly vertical,and the apparent dip is about 80°degree.The vertical displacement is between 10 to 13 meters,and the size of fault becomes smaller from the north to the south.The fault is characterized with a normal tensile fault with high dip angle.No evidence of secondary fault was detected in this survey.The results from dating of soil samples indicate the last faulting activity occurred in the late period of middle Pleistocene.
出处
《震灾防御技术》
2010年第4期451-460,共10页
Technology for Earthquake Disaster Prevention
基金
云南省自然科学基金(2007DOBM)资助
关键词
白邑-横冲断裂
浅层地震勘探
反射波法
隐伏断层
Baiyi-Henchong fault
Shallow seismic exploration
Reflection method
Buried fault
