基于重力测点和段差变化的前郭5.8级震群研究与三维反演
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摘要
利用东北地区近几年流动重力观测数据,分析前郭5.8级震群周边重力点值的时序变化特征,并基于重力段差变化对东北地区整体和局部重力变化引入能够反映异常显著性程度的指标量G和C值,最后对前郭5.8级震群前的重力场动态变化作三维密度反演。结果表明:1)前郭5.8级震群发震构造两侧的局部重力变化具有较明显的差异性,其变化趋势可作为识别构造活化或解耦运动的标志;2)显著性指标量G和C值能够为地震重力前兆的定量描述提供新思路;3)震前重力变化的反演结果显示地震发生在质量运移的过渡区域,垂向反演结果对本次地震的震源深度有一定的揭示意义。
Using recent years flow gravity measurements from northeast China, we analyze in detail the time series variation characteristics of the flow gravity points around the Qianguo M_S5.8 earthquake swarm. Based on the variation of gravity segment difference, the index values G and C are introduced to the whole and local gravity variations in northeast China, which reflects the degree of anomaly significance. Finally, we do 3 D density inversion of the dynamic change of gravity field before the Qianguo M_S5.8 earthquake swarm. The results show that:(1) The gravity variations on both sides of the seismogenic structure have obvious differences, which can be used as a sign to identify the tectonic activation or decoupling motion.(2) As a new method to describe the variation of regional gravity field, the significant indices G and C can provide a new idea for quantitative description of seismic gravity precursors.(3) The inversion results of gravity variation before the earthquake show that the earthquake occurred in the transitional region of mass migration, and the vertical inversion results have a certain significance for revealing the focal depth of this earthquake.
Using recent years flow gravity measurements from northeast China, we analyze in detail the time series variation characteristics of the flow gravity points around the Qianguo M_S5.8 earthquake swarm. Based on the variation of gravity segment difference, the index values G and C are introduced to the whole and local gravity variations in northeast China, which reflects the degree of anomaly significance. Finally, we do 3 D density inversion of the dynamic change of gravity field before the Qianguo M_S5.8 earthquake swarm. The results show that:(1) The gravity variations on both sides of the seismogenic structure have obvious differences, which can be used as a sign to identify the tectonic activation or decoupling motion.(2) As a new method to describe the variation of regional gravity field, the significant indices G and C can provide a new idea for quantitative description of seismic gravity precursors.(3) The inversion results of gravity variation before the earthquake show that the earthquake occurred in the transitional region of mass migration, and the vertical inversion results have a certain significance for revealing the focal depth of this earthquake.
引文
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[14] 陈石,王青华,王谦身,等.云南鲁甸MS6.5地震震源区和周边三维密度结构及重力场变化[J].地球物理学报,2014,57(9):3 080-3 090(Chen Shi,Wang Qinghua,Wang Qianshen,et al.The 3D Density Structure and Gravity Change of Ludian MS6.5 Yunnan epicenter and surrounding regions[J].Chinese Journal of Geophysics,2014,57(9):3 080-3 090)
[15] 李晓一,陈石,卢红艳,等.离散时变重力数据的可视化、指标量定义与解释[J].地震学报,2017,39(5):682-693(Li Xiaoyi,Chen Shi,Lu Hongyan,et al.The Index Definition,Interpretation and Visualization of Discrete Time-variable Gravity Data[J].Acta Seismologica Sinica,2017,39(5):682-693)
[16] 王同庆,陈石,梁伟锋,等.2016年门源MS6.4地震前的区域重力场变化与定量参数分析[J].地震地质,2018,40(2):349-360(Wang Tongqing,Chen Shi,Liang Weifeng,et al.The Variation of Regional Gravity Field and Quantitative Parameter Analysis Before 2016 Menyuan MS6.4 Earthquake[J].Seismology and Geology,2018,40(2):349-360)
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[19] 陈石,徐伟民,祝意青,等.震前重力场变化质源体边界和危险区划定方法研究[J].地震,2011,31(4):98-107(Chen Shi,Xu Weimin,Zhu Yiqing,et al.Estimating the Boundary of Density Anomaly Source and Hazard Zone Based on Gravity Variation before Earthquakes[J].Earthquake,2011,31(4):98-107)
[2] 顾功叙,刘克人,郑金涵,等.中国京津唐地区时间上连续的重力变化与地震的孕育和发生[J].科学通报,1997,42(18):1 919-1 930(Gu Gongxu,Liu Keren,Zheng Jinhan,et al.Seismogenesis and Occurrence of Earthquake as Observed by Temporally Continuous Gravity Variations in China[J].Chinese Science Bulletin,1997,42(18):1 919-1 930)
[3] 申重阳,李辉,孙少安,等.重力场动态变化与汶川MS8.0地震孕育过程[J].地球物理学报,2009,52(10):2 547-2 557(Shen Chongyang,Li Hui,Sun Shaoan,et al.Dynamic Variation of Gravity and the Preparation Process of the Wenchuan MS8.0 Earthquake[J].Chinese J Geophys,2009,52(10):2 547-2 557)
[4] 祝意青,闻学泽,孙和平,等.2013年四川芦山MS7.0地震前的重力变化[J].地球物理学报,2013,56(6):1 887-1 894(Zhu Yiqing,Wen Xueze,Sun Heping,et al.Gravity Changes before the Lushan,Sichuan,MS7.0 Earthquake of 2013[J].Chinese J Geophys,2013,56(6):1 887-1 894 )
[5] 张兴洲,杨宝俊,吴福元,等.中国兴蒙-吉黑地区岩石圈结构基本特征[J].中国地质,2006,33(4):816-823(Zhang Xingzhou,Yang Baojun,Wu Fuyuan,et al.The Lithosphere Structure in the Hingmong-Jihei Region,Northeastern China[J].Geology in China,2006,33(4):816-823)
[6] 杜晓娟,孟令顺,张明仁,等.利用重力场研究东北地区断裂分布及构造分区[J].地球科学与环境学报,2009,31(2):200-206(Du Xiaojuan,Meng Lingshun,Zhang Mingren,et al.Research on Fault Distribution and Tectonic Divisions in Northeast China in Terms of Gravity Field[J].Journal of Earth Sciences and Enviroment,2009,31(2):200-206)
[7] 索奎,张贵宾,江国明,等.重震反演中国东北地壳上地幔三维密度结构[J].地球物理学报,2015,58(7):2 436-2 444(Suo Kui,Zhang Guibin,Jiang Guoming,et al.3-D Density Distribution of the Crust and Upper Mantle beneath Northeast China by Joint Inversion of Gravity and Seismic Data[J].Chinese J Geophys,2015,58(7):2 436-2 444)
[8] 陈作全,吴成智,张淑洁,等.2013年前郭M5.8级强震群序列特征分析[J].防灾减灾学报,2015,31(3):11-15(Chen Zuoquan,Wu Chengzhi,Zhang Shujie,et al.Sequence Analysis of Strong Earthquake Group the M5.8 in 2013[J].Journal of Disaster Prevention and Reduction,,2015,31(3):11-15)
[9] 孙旭丽,邹本良,唐春呈,等.前郭5.8级震群地下流体异常特征分析[J].地震地磁观测与研究,2015,36(6):66-72(Sun Xuli,Zou Benliang,Tang Chuncheng,et al.Analysis on Characteristics of Underground Fluid Anomalies of Qianguo MS5.8 Earthquake Swarm[J].Seismological and Geomagnetic Observation and Research,2015,36(6):66-72)
[10] 康建红,张洪艳,张宇,等.2013年吉林前郭强震群序列地震视应力变化特征[J].地震地磁观测与研究,2016,37(1):1-6(Kang Jianhong,Zhang Hongyan,Zhang Yu,et al.Variation of Apparent Stress of Qianguo Strong Earthquake Swarm in 2013[J].Seismological and Geomagnetic Observation and Research,2016,37(1):1-6)
[11] 王同庆,赵云峰,常金龙,等.东北地区重力场动态变化特征与前郭5.8级震群关系研究[J].大地测量与地球动力学,2018,38(3):249-253(Wang Tongqing,Zhao Yunfeng,Chang Jinlong,et al.Study on the Relationship between Recent Variation Characteristics of Gravity Field and Qianguo MS5.8 Earthquake Swarm in Northeast China[J].Journal of Geodesy and Geodynamics,2018,38(3):249-253)
[12] 刘绍府,刘冬至,李辉,等.高精度重力测量平差及其软件[J].地震,1991(4):57-66(Liu Shaofu,Liu Dongzhi,Li Hui,et al.Adjustment of High Precision Gravity Measurement and Its Software[J].Earthquake,1991(4):57-66)
[13] 张洪艳,张广伟,王晓山,等.2013年吉林前郭5.8级震群精定位及发震构造分析[J].中国地震,2015,31(3):518-528(Zhang Hongyan,Zhang Guangwei,Wang Xiaoshan,et al.Relocations of Qianguo Earthquake Sequence and Its Seismotectonic Analysis[J].Earthquake Research in China,2015,31(3):518-528)
[14] 陈石,王青华,王谦身,等.云南鲁甸MS6.5地震震源区和周边三维密度结构及重力场变化[J].地球物理学报,2014,57(9):3 080-3 090(Chen Shi,Wang Qinghua,Wang Qianshen,et al.The 3D Density Structure and Gravity Change of Ludian MS6.5 Yunnan epicenter and surrounding regions[J].Chinese Journal of Geophysics,2014,57(9):3 080-3 090)
[15] 李晓一,陈石,卢红艳,等.离散时变重力数据的可视化、指标量定义与解释[J].地震学报,2017,39(5):682-693(Li Xiaoyi,Chen Shi,Lu Hongyan,et al.The Index Definition,Interpretation and Visualization of Discrete Time-variable Gravity Data[J].Acta Seismologica Sinica,2017,39(5):682-693)
[16] 王同庆,陈石,梁伟锋,等.2016年门源MS6.4地震前的区域重力场变化与定量参数分析[J].地震地质,2018,40(2):349-360(Wang Tongqing,Chen Shi,Liang Weifeng,et al.The Variation of Regional Gravity Field and Quantitative Parameter Analysis Before 2016 Menyuan MS6.4 Earthquake[J].Seismology and Geology,2018,40(2):349-360)
[17] 刘希康,丁志峰,李媛,等.重力数据三维共轭梯度聚焦反演及应用[J].地震,2017,37(1):10-19(Liu Xikang,Ding Zhifeng,Li Yuan,et al.3D Focusing Inversion of Gravity Data Based on Conjugate Gradient and Its Application[J].Earthquake,2017,37(1):10-19)
[18] Li Y G,Oldenburg D W.3D Inversion of Gravity Data[J].Geophysics,1996,61(2):394-408
[19] 陈石,徐伟民,祝意青,等.震前重力场变化质源体边界和危险区划定方法研究[J].地震,2011,31(4):98-107(Chen Shi,Xu Weimin,Zhu Yiqing,et al.Estimating the Boundary of Density Anomaly Source and Hazard Zone Based on Gravity Variation before Earthquakes[J].Earthquake,2011,31(4):98-107)
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