Major Active Faults in Lingqiu Basin and the Seismogenic Structure of the Earthquake in 1626
详细信息
- 责任者：Ma Xingquan (Key Laboratory of Active Tectonics and Volcano ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Li Yanbao
- 刊名：Seismology and Geology
- 出版年：2013
- 卷期：35(2)
- 关键词：活动断层 ; active faults ; 孕震构造 ; seismogenic tectonics ; 山西 ; Shanxi Province
- 页码：p.208-221
- 图表：illus., 14 refs.
- 分类号：0500
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
摘要
Lingqiu Basin is located in the northeast of the Shanxi graben system,where a MS 7. 0 earthquake occurred in 1626. This paper analyzes the geomorphologic characteristics in the whole basin via interpreting SPOT5 images,SRTM3 and fieldwork,and acquires some new knowledge of the major faults in combination with trenching. The activity of the main segment of the piedmont fault of Taibaiwei Mountains is limited to the Late Pleistocene. The NEE-striking Shuijian-Luoshuihe Fault has obvious geomorphic features to the west of Lingqiu County,and the geomorphic feature of the fault is not remarkable to the east of the county. Its latest event left a 1 m-high fault scarp on the surface. The NW-striking Huashanhe Fault behaves as a hinge fault. In the northern basin,the fault dips west,producing a height difference of about 10 m in terrace T1 of the Huashanhe River. In the southern basin,the fault dips east. Profiles and geomorphic features show the south segment of the fault is an active strike-slip fault with a high angle. Thus, the authors consider the earthquake in 1626 resulted from the conjugated action of the NEE-striking Shuijian-Luoshuihe Fault and the NW-striking Huashanhe Fault.