节点文献
安徽北部涡河断裂第四纪活动特征及地震危险性初步研究
Preliminary Study on Characteristics of Quaternary Tectonic Activity and Seismic Hazard of Guohe Fault in Northern Part of Anhui Province
【摘要】 涡河断裂整体走向310°左右,全长约190 km,断裂在卫星影像图和区域重、磁异常图上均有明显显示,是安徽北部一条重要的第四纪活动断裂。本文通过采用高精度重力测量法和激发极化电测深法,对研究区进行物探勘测工作,确定了断裂的大致位置及产出状态,认为涡河断裂埋深150 m左右,断层宽度约为150~200 m,倾角近直立,具正断层性质。结合野外地质调查情况及前人资料,综合分析认为涡河断裂第四纪以来具有较强的活动性,是一条影响范围较广、规模较大的断裂。通过分析涡河断裂与近EW向横向构造的关系,将断裂分成北、中、南三段;结合地震空区理论分析认为南段未来发生Ms5级以上地震的危险性最大,其最大震级在5.5级与6级之间。
【Abstract】 Guohe Fault is obviously shown in satellite images and regional gravity and magnetic anomaly maps. The fault controlled the thickness of Quaternary sediment of both sides. In this paper,by using the high accuracy gravity measurement method and induced polarization method,we conduct geophysical survey in the study area. Through the study,we fix approximate location and output state of the fault,the fault depth of 150 meters,the width of 150- 200 meters,nearly vertical dip. According to field geological survey and previous data,we think that the Guohe Fault is a broader,larger scale of Quaternary fault. Through analysis of the relationship between Guohe Fault and EW trending transverse structure,the fault is divided into three sections of north,middle and south. Combined with the seismic gap theory,we analyze that the potential future Ms≥5 earthquakes is most dangerous on the south segment of the fault,the maximum magnitude between Ms 5. 5 and Ms 6.
【Key words】 Guohe Fault; characteristics of quaternary tectonic activity; segmentation of active fault; seismic hazard; maximum magnitude;
- 【文献出处】 防灾科技学院学报 ,Journal of Institute of Disaster Prevention , 编辑部邮箱 ,2015年01期
- 【分类号】P315.2
- 【被引频次】6
- 【下载频次】88