[1]LIU Lei,JIANG Fengyun,ZHU Liangyu.Characteristics of Recent Crustal Movement and Seismicity in the Northern Section of the North-South Seismic Belt[J].Journal of Seismological Research,2020,43(04):658-665.
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Characteristics of Recent Crustal Movement and Seismicity in the Northern Section of the North-South Seismic Belt
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
43
Number of periods:
2020 04
Page number:
658-665
Column:
Public date:
2020-09-17
- Title:
- Characteristics of Recent Crustal Movement and Seismicity in the Northern Section of the North-South Seismic Belt
- Keywords:
- the northern section of the North-south Seismic Belt; strain rate field; GPS velocity field; seismic risk
- CLC:
- P315.725
- DOI:
- -
- Abstract:
- Using the GPS velocity field during 1991 and 2015,we describe the characteristics of the current crustal horizontal movement of the northern section of the North-South Seismic Belt.We investigated the tectonic dynamics and seismic hazard in the northern section of the North-South Seismic Belt by analyzing the spatial distribution characteristics of the principal strain rate,surface expansion rate,maximum shear strain rate,and small earthquakes.And we also analyzed the activity and seismic risk of main faults in the northern section of the North-South Seismic Belt.The results show that:①The high main strain rate and the high maximum shear strain rate are distributed near the Haiyuan fault tectonic belt,while the Xiangshan-Tianjingshan fault and the middle-southern segment of the Liupanshan fault have lower strain rate.Combined with the historical earthquake and the elapsed time,we deduced that Xiangshan-Tianjingshan fault and the Liupanshan fault may be in the Late phase of strong earthquake preparation; ②Therecent strike-slip rate of the Haiyuan fault is(4±0.5)mm/a.And the seismic activity of the Xiangshan-Tianjingshan fault,the Yantongshan fault and the Niushoushan fault was weak,these faults are generally characterized by thrust and strike-slip; ③The seismic depth profile shows that the distribution of earthquakes in the Laohushan fault and the south-eastern section of the Haiyuan fault is relatively dense and uniform,while few earthquakes are distributed in the north-western section of the Haiyuan fault.There is a sparse section of earthquakes in the south-eastern section of the Xiangshan-Tianjingshan fault,and the fault may have been locked which should be paid more attention to in the future.
- References:
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Last Update:
2020-09-17