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[1]TIAN Youping,SHEN Ping,WAN Yongge,et al.Quantitative Results and Confidence Interval Analysis of the Stress Field in Hunan Region[J].Journal of Seismological Research,2023,46(04):483-490.[doi:10.20015/j.cnki.ISSN1000-0666.2023.0052]

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Quantitative Results and Confidence Interval Analysis of the Stress Field in Hunan Region

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 46 Number of periods: 2023 04 Page number: 483-490 Column: Public date: 2023-12-01

Title:: Quantitative Results and Confidence Interval Analysis of the Stress Field in Hunan Region

Author(s):: TIAN Youping¹; SHEN Ping¹; WAN Yongge²; 3; TANG Hongliang¹; KANG Chengxu¹; YAO Haidong¹; SHE Xuming¹; YE Shishan⁴; (1.Hunan Earthquake Disaster Risk Prevention Center,Hunan Earthquake Agency,Changsha 410004,Hunan,China)(2.Institute of Disaster Prevention,Sanhe 065201,Hebei,China)(3.Hebei Key Laboratory of Earthquake Dynamics,Sanhe 065201,Hebei,China)(4.Guangdong Earthquake Agency,Guangzhou 510070,Guangdong,China)

Keywords:: stress field; the grid-trial method; the grid-search method; confidence interval; Hunan region

CLC:: P315.727

DOI:: 10.20015/j.cnki.ISSN1000-0666.2023.0052

Abstract:: Based on 529 P-wave polarity data of 312 earthquakes and the focal mechanism of 32 earthquakes with magnitude over 2.8 in Hunan and its neighboring region,we obtain the quantitative results and confidence ranges of the tectonic stress field in Hunan region by using the grid trial method and the grid search method respectively.The mean stress field calculated by the grid trial method shows that the azimuth of P-axis is 102°,the dip angle of P-axis is 10°,and the azimuth and dip angle of T-axis are 237° and 76° respectively.The results from the grid search inversion show that the azimuth and dip angle of P-axis are 100° when confidence interval is 79°-100°,and 5° when confidence interval is 2°-5°,and the azimuth and dip angle of T-axis are 225° when confidence interval is 204°-225°,and 81° when confidence interval is 81°-82°.According to the results of two stress field algorithms,the average focal mechanism proves to be reverse fault in Hunan region.The dominant direction of the principal compressive stress is NWW,and its dip angle is almost horizontal.The dominant direction of the principal tensile stress is NE-NEE,and its dip angle is large.We analyze the reliability of the inversion results from two algorithms,and compare with the previous study,and prove that the results proposed in this paper is of high reliability.

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Last Update: 2023-10-01