云南地震流动重力监测网建设与映震能力分析
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摘要
总结云南地区流动重力测网建设,根据分形几何原理,计算云南及周边地区现行测网的空间格网距和空间分辨率,给出最佳格网距为69 km,空间分辨率为61 km。结合近年云南及周边地区流动重力观测成果,绘制重力场变化图像,分析2014-08-03鲁甸6.5级地震、2014-10-07景谷6.6级地震以及2015年以后大理-保山一带部分5级以上地震相关重力场变化。综合分析认为,云南及周边地区流动重力监测网能识别5级以上地震相关的重力变化,但个别地区监测能力仍需加强。
This article summarizes the history of mobile gravimetry network construction in Yunnan. The grid space and spatial resolution of the gravimetry network in Yunnan and its adjacent areas are calculated according to the principle of fractal geometry. The results show that the optimum grid spacing is 69 km and spatial resolution is 61 km. According to gravity observations in recent years, we prepare a series of images of gravity field changes. The gravity changes for Ludian M6.5 earthquake on August 3, 2014, Jinggu M6.6 earthquake on October 7, 2014, and some earthquakes with magnitude larger than 5 in Dali-Baoshan region, are analyzed. In conclusion, the gravity changes for earthquakes with magnitude greater than 5 can be identified by mobile gravimetry in Yunnan and its adjacent areas, and the network should be improved in the future.
This article summarizes the history of mobile gravimetry network construction in Yunnan. The grid space and spatial resolution of the gravimetry network in Yunnan and its adjacent areas are calculated according to the principle of fractal geometry. The results show that the optimum grid spacing is 69 km and spatial resolution is 61 km. According to gravity observations in recent years, we prepare a series of images of gravity field changes. The gravity changes for Ludian M6.5 earthquake on August 3, 2014, Jinggu M6.6 earthquake on October 7, 2014, and some earthquakes with magnitude larger than 5 in Dali-Baoshan region, are analyzed. In conclusion, the gravity changes for earthquakes with magnitude greater than 5 can be identified by mobile gravimetry in Yunnan and its adjacent areas, and the network should be improved in the future.
引文
[1] 申重阳,李辉,谈洪波.汶川8.0级地震同震重力与形变效应模拟[J].大地测量与地球动力学,2008,28(5):6-12(Shen Chongyang,Li Hui,Tan Hongbo.Simulation of Coseismic Gravity Changes and Deformation Effect of Wen chuan MS8.0 Earthquake[J]. Journal of Geodesy and Geodynamics, 2008,28(5):6-12)
[2] 祝意青,梁伟锋,徐云马,等.汶川MS8.0地震前后的重力场动态变化[J].地震学报,2010,32(6):633-640(Zhu Yiqing,Liang Weifeng,Xu Yunma, et al.Dynamic Variation of Gravity Field before and after Wenchuan MS8.0 Earthquake[J].Acta Seismologica Sinica,2010,32(6):633-640)
[3] 贾民育,邢灿飞,孙少安.滇西重力变化的二维图像及其与5级(MS)以上地震的关系[J].地壳形变与地震,1995,15(3):9-19(Jia Minyu,Xing Canfei,Sun Shaoan.Two-Dimension Pictures of Gravity Change in Western Yunnan and Their Relations to the Earthquakes MS>5.0[J].Crustal Deformation and Earthquake,1995,15(3):9-19)
[4] 贾民育.滇西动态重力网的分形特征及空间分辨力[J].地壳形变与地震,1996,16(4):26-30(Jia Minyu. Fractal Characteristics and Spatial Resolution of Dynamic Gravity Network in Western Yunnan[J].Crustal Deformation and Earthquake,1996,16(4):26-30)
[5] 贾民育,詹洁晖.中国地震重力监测体系的结构与能力[J].地震学报,2000,22 (4):360-367(Jia Minyu,Zhan Jiehui.The Structure and Ability of the China Seismological Gravity Monitoring System[J].Acta Seismologica Sinica, 2000,22 (4):360-367)
[6] 徐云马,祝意青,程宏宾.1998～2004年滇西地区重力场演化与MS≥6.0地震[J]. 大地测量与地球动力学,2008,28(2):51-55(Xu Yunma, Zhu Yiqing,Cheng Hongbin.Relations between Changes of Gravity Field and MS≥6.0 Earthquakes in Western Yunnan during 1998-2004[J]. Journal of Geodesy and Geodynamics, 2008,28 (2):51-55)
[7] 祝意青,郭树松,刘芳.攀枝花6.1、姚安6.0级地震前后区域重力场变化[J].大地测量与地球动力学,2010,30(4):8-11(Zhu Yiqing,Guo Shusong,Liu Fang.Variation of Gravity Field before and after Panzhihua MS6.1 and Yaoan MS6.0 Earthquakes[J].Journal of Geodesy and Geodynamics, 2010,30(4):8-11)
[8] 申重阳,谈洪波,郝洪涛,等.2009年姚安MS6.0地震重力场前兆变化机理[J].大地测量与地球动力学,2011,31(2):17-22(Shen Chongyang,Tan Hongbo,Hao Hongtao,et al.Mechanism of Precursory Gravity Change before Yaoan MS6.0 Earthquake in 2009[J].Journal of Geodesy and Geodynamics, 2011,31(2):17-22)
[9] 徐锡伟,江国焰,余贵华,等.鲁甸6.5级地震发震断层及其构造属性讨论[J].地球物理学报,2014,57(9):3 060-3 068(Xu Xiwei,Jiang Guoyan,Yu Guihua,et al.Discussion on Seismogenic Fault of the Ludian MS6.5 Earthquake and Its Tectomic Attribution[J].Chinese J Geophys,2014,57(9): 3 060-3 068)
[10] 石磊,贾晓东,陈石,等.2014年云南鲁甸6.5级地震前重力变化特征与三维反演[J].地震地质,2014,36(4):1 217-1 227(Shi Lei,Jia Xiaodong,Chen Shi,et al.Gravity Changes before the Ludian,Yunnan,MS6.5 Earthquake of 2014 and the Three-Dimensional Inversion Research[J].Seismology and Geology,2014,36(4):1 217-1 227)
[11] 常祖峰,陈晓利,陈宇军,等.景谷MS6.6地震同震地表破坏特征与孕震构造[J].地球物理学报,2016,59(7):2 539-2 552(Chang Zufeng,Chen Xiaoli,Chen Yujun,et al. The Co-Seismic Ground Failure Features and Seismogenic Structure of the Jinggu MS6.6 Earthquake[J].Chinese J Geophys,2016,59(7):2 539-2 552)
[2] 祝意青,梁伟锋,徐云马,等.汶川MS8.0地震前后的重力场动态变化[J].地震学报,2010,32(6):633-640(Zhu Yiqing,Liang Weifeng,Xu Yunma, et al.Dynamic Variation of Gravity Field before and after Wenchuan MS8.0 Earthquake[J].Acta Seismologica Sinica,2010,32(6):633-640)
[3] 贾民育,邢灿飞,孙少安.滇西重力变化的二维图像及其与5级(MS)以上地震的关系[J].地壳形变与地震,1995,15(3):9-19(Jia Minyu,Xing Canfei,Sun Shaoan.Two-Dimension Pictures of Gravity Change in Western Yunnan and Their Relations to the Earthquakes MS>5.0[J].Crustal Deformation and Earthquake,1995,15(3):9-19)
[4] 贾民育.滇西动态重力网的分形特征及空间分辨力[J].地壳形变与地震,1996,16(4):26-30(Jia Minyu. Fractal Characteristics and Spatial Resolution of Dynamic Gravity Network in Western Yunnan[J].Crustal Deformation and Earthquake,1996,16(4):26-30)
[5] 贾民育,詹洁晖.中国地震重力监测体系的结构与能力[J].地震学报,2000,22 (4):360-367(Jia Minyu,Zhan Jiehui.The Structure and Ability of the China Seismological Gravity Monitoring System[J].Acta Seismologica Sinica, 2000,22 (4):360-367)
[6] 徐云马,祝意青,程宏宾.1998～2004年滇西地区重力场演化与MS≥6.0地震[J]. 大地测量与地球动力学,2008,28(2):51-55(Xu Yunma, Zhu Yiqing,Cheng Hongbin.Relations between Changes of Gravity Field and MS≥6.0 Earthquakes in Western Yunnan during 1998-2004[J]. Journal of Geodesy and Geodynamics, 2008,28 (2):51-55)
[7] 祝意青,郭树松,刘芳.攀枝花6.1、姚安6.0级地震前后区域重力场变化[J].大地测量与地球动力学,2010,30(4):8-11(Zhu Yiqing,Guo Shusong,Liu Fang.Variation of Gravity Field before and after Panzhihua MS6.1 and Yaoan MS6.0 Earthquakes[J].Journal of Geodesy and Geodynamics, 2010,30(4):8-11)
[8] 申重阳,谈洪波,郝洪涛,等.2009年姚安MS6.0地震重力场前兆变化机理[J].大地测量与地球动力学,2011,31(2):17-22(Shen Chongyang,Tan Hongbo,Hao Hongtao,et al.Mechanism of Precursory Gravity Change before Yaoan MS6.0 Earthquake in 2009[J].Journal of Geodesy and Geodynamics, 2011,31(2):17-22)
[9] 徐锡伟,江国焰,余贵华,等.鲁甸6.5级地震发震断层及其构造属性讨论[J].地球物理学报,2014,57(9):3 060-3 068(Xu Xiwei,Jiang Guoyan,Yu Guihua,et al.Discussion on Seismogenic Fault of the Ludian MS6.5 Earthquake and Its Tectomic Attribution[J].Chinese J Geophys,2014,57(9): 3 060-3 068)
[10] 石磊,贾晓东,陈石,等.2014年云南鲁甸6.5级地震前重力变化特征与三维反演[J].地震地质,2014,36(4):1 217-1 227(Shi Lei,Jia Xiaodong,Chen Shi,et al.Gravity Changes before the Ludian,Yunnan,MS6.5 Earthquake of 2014 and the Three-Dimensional Inversion Research[J].Seismology and Geology,2014,36(4):1 217-1 227)
[11] 常祖峰,陈晓利,陈宇军,等.景谷MS6.6地震同震地表破坏特征与孕震构造[J].地球物理学报,2016,59(7):2 539-2 552(Chang Zufeng,Chen Xiaoli,Chen Yujun,et al. The Co-Seismic Ground Failure Features and Seismogenic Structure of the Jinggu MS6.6 Earthquake[J].Chinese J Geophys,2016,59(7):2 539-2 552)