呼图壁地区震源机制解及构造应力场特征分析
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摘要
基于新疆测震台网记录的数字地震波形,运用CAP方法测定呼图壁地区2010-01-15～2017-01-02共50次M_S≥3.0地震的震源机制解,同时结合早期23次M_S≥3.0地震的震源机制解数据,应用M_SATSI软件反演研究区时空应力场。结果表明,研究区应力结构类型表现为逆断型,整个区域主压应力P轴近NNE向且倾角较小,说明整个呼图壁地区应力场以NNE向水平挤压作用为主要特征。从空间上看,东部的水平挤压作用更为显著;从时间上看,2010～2016年受到更为显著的NNE向应力场控制,反映了研究区在不同时段应力场的调整变化,但没有改变该区域最大主压应力轴呈NNE向的总体特征,说明整个呼图壁地区可能主要受一种较稳定的NNE向应力场控制。
Using the seismic waveform data recorded by regional seismic network of Xinjiang and the method of CAP,we calculate the focal mechanism of 50 earthquakes with magnitude M_S≥3.0 occurring in Hutubi during from Jan.15,2010 to Jan.2,2017.Then,we analyze the types and the regional features of the focal mechanism of earthquakes in Hutubi.Based on the data of the above focal mechanism solutions,we invert the stress field of Hutubi area using M_SATSI software.The result shows that the main compressional stress Paxis is near NNE,indicating that the region stress field is mainly under action of the level extrusion of NNE.The horizontal compression is more obvious in the eastern part of the study area.Stress field is more significant for NNE direction during 2010 to 2016,but does not change the general characteristics of the maximum principal stress axis in the region,indicating that the study area may be mainly affected by a stable stress field of NNE.
Using the seismic waveform data recorded by regional seismic network of Xinjiang and the method of CAP,we calculate the focal mechanism of 50 earthquakes with magnitude M_S≥3.0 occurring in Hutubi during from Jan.15,2010 to Jan.2,2017.Then,we analyze the types and the regional features of the focal mechanism of earthquakes in Hutubi.Based on the data of the above focal mechanism solutions,we invert the stress field of Hutubi area using M_SATSI software.The result shows that the main compressional stress Paxis is near NNE,indicating that the region stress field is mainly under action of the level extrusion of NNE.The horizontal compression is more obvious in the eastern part of the study area.Stress field is more significant for NNE direction during 2010 to 2016,but does not change the general characteristics of the maximum principal stress axis in the region,indicating that the study area may be mainly affected by a stable stress field of NNE.
引文
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[2]黄禄渊,张贝,程惠红,等.2015年智利Illapel MW8.3地震同震效应及其对南美大陆地震危险性影响[J].地球物理学报,2017,60(1):163-173(Huang Luyuan,Zhang Bei,Cheng Huihong,et al.The Co-seismic Effect of the 2015 Chile Illapel MW8.3Earthquake and Its Effect on Seismic Risk of South America[J].Chinese Journal of Geophysics,2017,60(1):163-173)
[3]黄禄渊,张贝,瞿武林,等.2010智利Maule特大地震的同震效应[J].地球物理学报,2017,60(3):972-984(Huang Luyuan,Zhang Bei,Qu Wulin,et al.The Co-seismic Effects of 2010Maule Earthquake[J].Chinese Journal of Geophysics,2017,60(3):972-984)
[4]木拉提江·阿不来提,闫玮,阿里木江·买买提依明,等.2016年11月25日新疆阿克陶MS6.7地震前兆异常分析[J].内陆地震,2017,31(2):222-228(Mulatijiang Abulaiti,Yan Wei,Alimujiang Maimaitiyiming,et al.Precursory Anomaly before Aketao Earthquake with MS6.7on November 25th,2016[J].Inland Earthquake,2017,31(2):222-228)
[5]张志斌,李艳永,朱皓清,等.2014年7月9日麦盖提MS5.1地震震源机制解与发震断层研究[J].地震地磁观测与研究,2015,36(6):1-7(Zhang Zhibin,Li Yanyong,Zhu Haoqing,et al.Analysis of Focal Mechanism Solution and Seismic Fault of Markit MS5.1Earthquake on July 9,2014[J].Seismological and Geomagnetic Observation and Research,2015,36(6):1-7)
[6]李莹甄,沈军,聂晓红,等.乌鲁木齐地区现今构造应力场综合分析[J].地震学报,2011,33(1):15-27(Li Yingzhen,Shen Jun,Nie Xiaohong,et al.Comprehensive Analysis on Present Tectonic Stress Field in Urumqi Region[J].Acta Seismologica Sinica,2011,33(1):15-27)
[7]万永革.联合采用定性和定量断层资料的应力张量反演方法及在乌鲁木齐地区的应用[J].地球物理学报,2015,58(9):3 144-3 156(Wan Yongge.A Grid Search Method for Determination of Tectonic Stress Tensor Using Qualitative and Quantitative Data of Active Faults and Its Application to the Urumqi Area[J].Chinese Journal of Geophysics,2015,58(9):3 144-3 156)
[8]王成虎.地应力主要测试和估算方法回顾与展望[J].地质论评,2014,60(5):971-996(Wang Chenghu.Brief Review and Outlook of Main Estimate and Measurement Methods for In-Situ Stresses in Rock Mass[J].Geological Review,2014,60(5):971-996)
[9] Zhao L S,Helmberger D V.Source Estimation from Broadband Regional Seismograms[J].Bulletin of the Seismological Society of America,1994,84(1):91-104
[10]Zhu L P,Helmberger D V.Advancement in Source Estimation Techniques Using Broadband Regional Seismograms[J].Bulletin of the Seismological Society of America,1996,86(5):1 634-1 641
[11]Hardebeck J L,Michael A J.Damped Regional-scale Stress Inversions:Methodology and Examples for Southern California and the Coalinga Aftershock Sequence[J].Journl of Geophysical Research:Solid Earth,2006,111(B11)
[12]Martínez-Garzón P,Kwiatek G,Ickrath M,et al.MSATSI:A MATLAB Package for Stress Inversion Combining Solid Classic Methodology,a New Simplified User-Handling,and a Visualization Tool[J].Seismological Research Letters,2014,85(4):896-904
[13]Frohlich C.Triangle Diagrams:Ternary Graphs to Display Similarity and Diversity of Earthquake Focal Mechanisms[J].Physics of the Earth and Planetary Interiors,1992,75(1-3):193-198
[14]李金,周龙泉,龙海英,等.天山地震带(中国境内)震源机制一致性参数的时空特征[J].地震地质,2015,37(3):792-803(Li Jin,Zhou Longquan,Long Haiying,et al.Spatial-Temporal Characteristics of the Focal Mechanism Consistency Parameter in Tianshan(within Chinese Territory)Seismic Zone[J].Seismology and Geology,2015,37(3):792-803)
[15]龙海英,高国英,聂晓红,等.北天山中东段中小地震震源机制解及应力场反演[J].地震,2008,28(1):93-99(Long Haiying,Gao Guoying,Nie Xiaohong,et al.The Focal Mechanism Solution and Stress Field Inversion of Small and Moderate Earhquakes Along Middle-Eastern Part of Northern Tianshan Region[J].Earthquake,2008,28(1):93-99)
[16]龙海英,高国英,聂晓红,等.北天山地区中强地震震源机制解分析[J].中国地震,2008,24(1):23-30(Long Haiying,Gao Guoying,Nie Xiaohong,et al.Focal Mechanism Solution and Stress Field Inversion of Moderately Strong Earthquake in the Northern Tianshan Area[J].Earthquake Research in China,2008,24(1):23-30)