Identification of Seismogenic Fault Plane of Focal Mechanism Solutions Based on Tectonic Stress Fields:A Case study of Haicheng and Yingkou of Liaoning Province and Their Surrounding Areas
DAI Yinglei
LI Zihao
LI Lintong
LIU Linting
HOU Zuoliang
Abstract：In order to explore the applicability of the identification method of seismogenic fault plane of focal mechanism solutions based on the tectonic stress field in Liaoning area,the P-wave first motion method was used to calculate and collect 253 focal mechanism solutions in Liaoning area.They were classified according to the areal strain of the horizontal strain rosette of the focal mechanism.While inverting the tectonic stress field in the source area,the determined seismogenic fault plane of focal mechanism solutions was given.The results show that earthquakes in Liaoning area are mostly strike-slip and normal faults.The dominant distribution direction of the maximum principal stress in the tectonic stress field is NEE,and the dip angle is mostly horizontal or nearly vertical.The orientation of intermediate principal stress is discrete,and the dip angle is steep.The minimum principal stress is mainly in the NNW direction,and the dip angle is small.In general,it belongs to a strike-slip stress system dominated by tensile stress.The identified 195 seismogenic fault planes of focal mechanism solutions are consistent with the characteristics of main seismic control structures and Anderson fault theory.The accuracy is remarkable for intermediate and strong earthquakes,and there is also certain reliability for small earthquakes.This paper proves that the application of this method in Liaoning is feasible.
Keywords：Focal mechanism solutionTectonic stress fieldFault instability coefficientSeismogenic faultLiaoning area
Publication Date：2024-12-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 11-20 )