MAJOR ACTIVE FAULTS IN LINGQIU BASIN AND THE SEISMOGENIC STRUCTURE OF THE EARTHQUAKE IN 1626

doi:10.3969/j.issn.0253-4967.2013.02.002

Abstract

Abstract:

Lingqiu Basin is located in the northeast of the Shanxi graben system,where a M_S 7.0 earthquake occurred in 1626.The achievement of active fault research in this basin could contribute not only to the study of the seismogenic structure of the earthquake in 1626,but also to the research of the types of large earthquakes in Shanxi graben system. Much work has been conducted here,laying the foundation for the active fault study in this area. However,the spatial distribution and activity of several major faults,and the seismogenic structure of the earthquake in 1626 are still in discussion. 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 1m-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 10m 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,we consider the earthquake in 1626 resulted from the conjugated action of the NEE-striking Shuijian-Luoshuihe Fault and the NW-striking Huashanhe Fault.

Key words: active fault, 1626 Lingqiu earthquake, seismogenic fault, Lingqiu Basin

摘要：

灵丘盆地位于山西地堑系的东北部,曾于1626年发生7级地震.文中通过解译SPOT5影像、分析SRTM3数据和野外调查,对该盆地进行宏观的构造地貌分析和对比,结合探槽以及地质剖面确定主要活动断层的几何分布和最新活动特征,进而探讨灵丘地震的发震构造.结果显示: 太白维山山前断裂大部分段落最新活动时代限于晚更新世晚期.NE向的水涧-落水河断裂灵丘县城以西段造成同级地貌面高差约6m,其中最新活动在地表残留高约1m的断层陡坎,县城及以东段无明显地貌表现; NW向的华山河断裂具有枢纽断层特征,在盆地北部断裂向西倾并造成华山河Ⅰ级阶地两侧约10m的高差,在盆地南部断裂向东倾,剖面和相关地貌揭示该断裂在南段为一条高角度的活动正走滑断裂; 据此认为,1626年灵丘地震为水涧-落水河断裂西段和NW向的华山河断裂共轭作用的结果.

关键词: 活动断裂, 1626灵丘地震, 发震构造, 灵丘盆地

CLC Number:

P315.2

MA Xing-quan, LI Yan-bao, RAN Yong-kang, CHEN Li-chun. MAJOR ACTIVE FAULTS IN LINGQIU BASIN AND THE SEISMOGENIC STRUCTURE OF THE EARTHQUAKE IN 1626[J]. SEISMOLOGY AND GEOLOGY, 2013, 35(2): 208-221.

马兴全, 李彦宝, 冉勇康, 陈立春. 灵丘盆地主要活动断裂和1626灵丘地震发震构造[J]. 地震地质, 2013, 35(2): 208-221.

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