[1]WANG Yue,MENG Lingyuan,HAN Yanyan,et al.Relocation of the 2018 Tonghai MS5.0 Earthquakes Swarm,Yunnan and Velocity Imaging of the Source Region[J].Journal of Seismological Research,2020,43(02):331-339.
Copy
Relocation of the 2018 Tonghai MS5.0 Earthquakes Swarm,Yunnan and Velocity Imaging of the Source Region
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
43
Number of periods:
2020 02
Page number:
331-339
Column:
Public date:
2020-06-10
- Title:
- Relocation of the 2018 Tonghai MS5.0 Earthquakes Swarm,Yunnan and Velocity Imaging of the Source Region
- Keywords:
- Tonghai seismic swarm; double-difference location; relocated sequence; upper crustal velocity
- CLC:
- P315.72
- DOI:
- -
- Abstract:
- In this study,we relocated the 2018 Yunnan Tonghai MS5.0 earthquakes swarm and determined a 3D velocity model of the upper crust of source area using the double-difference seismic tomography method.All the seismic phase observation reports are provided by the China Earthquake Networks Center(CENC).The results show that the velocity structure of the epicenters of the Tonghai sequence present obvious lateral inhomogeneity.At the junction of the Yujiang fault and the Mingxing-erjie fault which was located in the south of Xiaojiang fault,and the velocity presents high values at the depth 5 km and till to the 10 km,while the velocity presents low values at the depth of 15 km.The well relocated epicenters of the Tonghai MS5.0 earthquakes sequence exhibited in a narrow band along the NE-SE direction,the distance between two main events is approximately 18 km,and the predominant range of depth distribution is from 3 km to 12 km.The depths of the two main events occurred on 13 and 14 August are 8.63 km and 9.16 km,respectively.Based on the comprehensive results of the velocity structure of source area,the distribution of the relocated epicenters and hypocenters,and the geological structures,we infer that a pre-exist fault which is parallel to the Mingxing-erjie fault is the seismogenic fault of the Tonghai MS5.0 seismic swarm.
- References:
- -
- Similar References:
Memo
-
Last Update:
2020-06-10