Precise Relocation of Small Earthquakes Occurred in North China and Its Tectonic Implication
详细信息
- 责任者：Zhang Guangwei (Institute of Crustal Dynamics ; China Earthquake Administration ; Beijing 100085 ; China) ; Lei Jianshe
- 刊名：Acta Seismologica Sinica
- 出版年：2011
- 卷期：33(6)
- 关键词：小震 ; small seisms ; 华北地区 ; North China
- 页码：p.699-714
- 图表：10 illus., 1 table, 45 refs.
- 分类号：0500
- 出版序号：20122261
- issnNo：ISSN0253-3782
- isbnNo：CN11-2021/P
摘要
In this paper, the authors collected 74 181 P-wave and 74 465 S-wave arrival times from 7 519 local earthquakes in North China recorded by 166 seismic stations. The result shows that the locations of the relocated earthquakes have been improved significantly over those of original ones. The results show that: 1) small earthquakes occurred in NNE-SSW trend on east side of the northern segment of the Tangshan seismic zone; 2) most relocated earthquakes in sea region of the Bohai Sea zone are at about 10 km depth, with a few earthquakes having a depth from a few to 10 km; and 3) small earthquakes around the fault zone in front Taihang Mountains gets deeper westward under the mountain, suggesting a deeper seismogenic layer beneath the mountain.