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[1]ZHOU Lin,JI Lingyun,LI Zhangjun,et al.Study on Current Deformation Process and Seismicity of Lenglongling Area Based on Small Earthquakes and GPS Data[J].Journal of Seismological Research,2022,45(03):416-423.[doi:10.20015/j.cnki.ISSN1000-0666.2022.0017 ]

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Study on Current Deformation Process and Seismicity of Lenglongling Area Based on Small Earthquakes and GPS Data

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 45 Number of periods: 2022 03 Page number: 416-423 Column: 生命线工程系统抗震防灾专栏 Public date: 2022-06-20

Title:: Study on Current Deformation Process and Seismicity of Lenglongling Area Based on Small Earthquakes and GPS Data

Author(s):: ZHOU Lin; JI Lingyun; LI Zhangjun; LI Jun; (Second Crust Monitoring and Application Center,China Earthquake Administration,Xi'an 710054,Shaanxi,China)

Keywords:: earthquake relocation; GPS; slip rate; Lenglongling area; the Menyuan earthquake

CLC:: P315.727

DOI:: 10.20015/j.cnki.ISSN1000-0666.2022.0017

Abstract:: In this paper,the geometric structures of major faults in Lenglongling area are studied by using the data of small earthquakes,and the crustal deformation characteristics of Lenglongling area are analyzed by combining the regional tectonic stress field inverted by using focal mechanism solution with the strain rate field calculated by GPS data.The results show that the main compressive stress in Lenglongling area is in NE direction,which is consistent with the direction of GPS main compressive strain rate.The peak value of strain rate field appears near the Minle-Damaying Fault to the north of the Lenglongling Fault.However,the activity of small earthquakes in this area is weak.The earthquakes in the western and eastern sections of the Huangcheng-Shuangta Fault occurred in the range of 15 km deep,with a tendency of SW and a large dip angle in the shallow part of the Crust,which getting gentler and gentler with the increase of depth.There is a seismic band in the middle section of the Huangcheng-Shuangta Fault,which is nearly perpendicular to this section,and the focal depth in this section is obviously larger than the ones in the western and eastern sections.The Lenglongling Fault is dominated by sinistral strike-slip movement and there is obvious compressional deformation on the south side of the fault.The GPS velocity component parallel to the Lenglongling Fault decreases and displays an obvious S-shaped deformation among the earthquakes.The slip rate 3.9 mm/yr and the latching depth 7.9 km of the Fault are respectively calculated by using the arctangent method.The Fault is estimated to have a seismic moment deficit of M₀=7.21×10¹⁹ N?m.This indicates that there is a risk of M_W7.2 earthquake in the future.

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Last Update: 2022-07-01