scholarly journals A more accurate relocation of the 2013 M s7.0 Lushan, Sichuan, China, earthquake sequence, and the seismogenic structure analysis

2015 ◽  
Vol 19 (3) ◽  
pp. 653-665 ◽  
Author(s):  
F. Long ◽  
X. Z. Wen ◽  
X. Ruan ◽  
M. Zhao ◽  
G. X. Yi
Keyword(s):  
Structure Analysis ◽  
Earthquake Sequence ◽  
Seismogenic Structure ◽  
China Earthquake

scholarly journals Focal Mechanism and Seismogenic Structure of the MS 5.1 Qingbaijiang Earthquake on February 3, 2020, Southwestern China

2021 ◽  
Vol 9 ◽  
Author(s):  
Min Zhao ◽  
Feng Long ◽  
Guixi Yi ◽  
MingJian Liang ◽  
Jiangtao Xie ◽  
...  
Keyword(s):  
Fault Zone ◽  
Focal Mechanism ◽  
Earthquake Sequence ◽  
Southwestern China ◽  
Joint Analysis ◽  
Focal Mechanism Solution ◽  
Inversion Method ◽  
Seismogenic Structure ◽  
Initial Rupture ◽  
Hypocentral Distribution

The 3 February 2020 MS 5.1 Qingbaijiang earthquake, southwestern China, is the closest recorded MS ≥ 5.0 event to downtown Chengdu City to date, with an epicentral distance of only 38 km. Here we analyze seismic data from the Sichuan and Chengdu regional seismic networks, and employ a multi-stage location method to relocate the earthquakes that have occurred along the central and northern segments of the Longquanshan fault zone since 2009, including the MS 5.1 Qingbaijiang earthquake sequence, to investigate the seismogenic structure of the region. The relocation results indicate that the seismicity along the central and northern segments of the Longquanshan fault zone has occurred mainly along the eastern branch since 2009, with the hypocentral distribution along a vertical cross-section illustrating a steep, NW-dipping parallel imbricate structure. The terminating depth of the eastern branch is about 12 km. The distribution of the MS 5.1 Qingbaijiang earthquake sequence is along the NE–SW-striking Longquanshan fault zone. The aftershock focal depths are in the 3–6 km range, with the mainshock located at 104.475°E, 30.73°N. Its initial rupture depth of 5.2 km indicates that the earthquake occurred above the shallow decollement layer of the upper crust in this region. The hypocentral distribution along the long axis of the aftershock area highlights that this earthquake sequence occurred along a fault dipping at 56° to the NW. Our surface projection of the inferred fault plane places it near the eastern branch of the Longquanshan fault zone. We infer the MS 5.1 mainshock to be a thrust faulting event based on the focal mechanism solution via the cut-and-paste waveform inversion method, with strike/dip/rake parameters of 22°/36°/91° and 200°/54°/89° obtained for nodal planes I and II, respectively. We identify that the seismogenic fault of the MS 5.1 Qingbaijiang earthquake lies along the eastern branch of the Longquanshan fault zone, and nodal plane II represents the coseismic rupture plane, based on a joint analysis of the event relocation results, mainshock focal mechanism, and regional geological information. Our study provides vital information for assessing the seismic hazard of the Longquanshan fault zone near Chengdu City.

scholarly journals Relocation of the 10 March 2011 Yingjiang, China, earthquake sequence and its tectonic implications

2012 ◽  
Vol 25 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Jianshe Lei ◽  
Guangwei Zhang ◽  
Furen Xie ◽  
Yuan Li ◽  
Youjin Su ◽  
...  
Keyword(s):  
Earthquake Sequence ◽  
Tectonic Implications ◽  
China Earthquake

Variation of stress during the rupture process of the 1995 M L=4.1 Shacheng, Hebei, China, earthquake sequence

2005 ◽  
Vol 18 (3) ◽  
pp. 297-302 ◽  
Author(s):  
Xue-zhong Chen ◽  
Xiang-tong Xu ◽  
Wen-jie Zhai
Keyword(s):  
Rupture Process ◽  
Earthquake Sequence ◽  
China Earthquake

Source Parameters of the 2014Ms 6.5 Ludian Earthquake Sequence and Their Implications on the Seismogenic Structure

2015 ◽  
Vol 86 (6) ◽  
pp. 1614-1621 ◽  
Author(s):  
Zujun Xie ◽  
Yong Zheng ◽  
Chengli Liu ◽  
Xiong Xiong ◽  
Yongdong Li ◽  
...  
Keyword(s):  
Source Parameters ◽  
Earthquake Sequence ◽  
Seismogenic Structure ◽  
Ludian Earthquake

Joint analysis of the 2014 Kangding, southwest China, earthquake sequence with seismicity relocation and InSAR inversion

2015 ◽  
Vol 42 (9) ◽  
pp. 3273-3281 ◽  
Author(s):  
Guoyan Jiang ◽  
Yangmao Wen ◽  
Yajing Liu ◽  
Xiwei Xu ◽  
Lihua Fang ◽  
...  
Keyword(s):  
Southwest China ◽  
Earthquake Sequence ◽  
Joint Analysis ◽  
China Earthquake

Relocation and seismogenic structure of the 1998 Zhangbei-Shangyi earthquake sequence

2002 ◽  
Vol 15 (4) ◽  
pp. 383-394 ◽  
Author(s):  
Zhi-xian Yang ◽  
Yun-tai Chen ◽  
Hong-zhi Zhang
Keyword(s):  
Earthquake Sequence ◽  
Seismogenic Structure
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