Moderate-Strong Earthquakes and Their Tectonic Correlation in the Liaodong Peninsula
详细信息
- 责任者：Wan Bo (Earthquake Administration of Liaoning Province ; Shenyang 110031 ; China) ; Jia Lihua
- 刊名：Seismology and Geology
- 出版年：2013
- 卷期：35(2)
- 关键词：地震活动性 ; seismicity ; 构造 ; geological structure ; 辽东半岛 ; Liaodong Peninsula
- 页码：p.300-314
- 图表：illus., 3 tables, 34 refs.
- 分类号：0500
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
摘要
Moderate-strong earthquakes happened very frequently in the Liaodong peninsula. In addition to the Haicheng M7. 3 earthquake in 1975,there are also 19 earthquakes of M≥5 recorded in this area. The earthquakes are distributed regularly,mainly restricted to seismic belts or to the grid nodes. The spatial distribution is accordant to the NE - NNE trending faults such as the Jinzhou Fault,the Yalujiang Fault,and to the NW-trending conjugated ones. Moderate-strong earthquakes happened mostly near the tectonic basins where two sets of faults intersect,or close to the NW-trending tectonic belt. The NE - NNE and NW-trending faults are a pair of conjugate sheer fracture planes characterized mainly by lateral strike-slip movement under the action of the contemporary NEEdirected near-horizontal principal stress. The NE - NNE faults belong to the inheritance fault,which control the regional geological tectonic pattern and its evolution,often large in size; while the NW ones mostly belong to newly-generated fault,and their size is usually related to the size of NE - NNE faults they conjugate with. The study shows that the moderate-strong earthquakes in the Liaodong peninsula are controlled mainly by the NE - NNE structures,and the seismogenic structures are basically the NW faults. Meanwhile,correlated with the size of the NW faults,the moderate-strong earthquake activities show a trend of decreasing gradually from north to south and from west to east,and the magnitude of them decreases roughly from M7 ～ 7. 5 to M5. 5 ～ 6 or so.
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