弱地震活动背景地区流动重力变化探析
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摘要
利用现有高精度流动重力测网观测资料,总结2016-10-20江苏射阳4.4级、2017-06-16湖北秭归4.3级、2017-07-15广西南丹4.0级、2018-02-09河南淅川4.3级等4次地震相关重力变化,探讨利用流动重力观测手段监测弱地震活动背景地区地震活动的可行性,并给出相应建议。
Based on the high accuracy observation data from the mobile gravimetry network, the gravity changes of four earthquakes, including Sheyang M4.4 earthquake on October 20, 2016 in Jiangsu, Zigui M4.3 earthquake on June 16, 2017 in Hubei, Nandan M4.0 earthquake on July 15, 2017 in Guangxi, and Xichuan M4.3 earthquake on February 9, 2018 in Henan, are summarized. The feasibility of small earthquake monitoring by mobile gravimetry in areas of weak seismic activity background is discussed, and some corresponding advice is given.
Based on the high accuracy observation data from the mobile gravimetry network, the gravity changes of four earthquakes, including Sheyang M4.4 earthquake on October 20, 2016 in Jiangsu, Zigui M4.3 earthquake on June 16, 2017 in Hubei, Nandan M4.0 earthquake on July 15, 2017 in Guangxi, and Xichuan M4.3 earthquake on February 9, 2018 in Henan, are summarized. The feasibility of small earthquake monitoring by mobile gravimetry in areas of weak seismic activity background is discussed, and some corresponding advice is given.
引文
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[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] 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 Shao’an, et al. Dynamic Variations of Gravity and the Preparation Process of the Wenchuan MS8.0 Earthquake[J]. Chinese Journal of Geophysics, 2009, 52(10): 2 547-2 557)
[7] 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)
[8] 陈运泰,顾浩鼎,卢造勋. 1975年海城地震与1976年唐山地震前后的重力变化[J]. 地震学报,1980, 2(1): 21-31(Chen Yuntai, Gu Haoding, Lu Zaoxun. Variations of Gravity before and after the Haicheng Earthquake, 1975 and the Tangshan Earthquake, 1976[J]. Acta Seismologica Sinica, 1980, 2(1): 21-31)
[9] 李瑞浩,付兆珠. 唐山地震(M=7.8)前后的区域重力变化和扩容过程[J]. 内陆地震,1987,1(4):426-434(Li Ruihao, Fu Zhaozhu. Local Gravity Variations before and after the Tangshan Earthquake(M=7.8) and the Dilatation Process[J]. Inland Earthquake, 1987, 1(4): 426-434)
[10] 申重阳. 地壳形变与密度变化耦合运动探析[J]. 大地测量与地球动力学,2005,25(3):7-12(Shen Chongyang. Preliminary Analysis of Coupling Movement between Crustal Deformation and Density Change[J]. Journal of Geodesy and Geodynamic, 2005, 25(3): 7-12)
[11] 孙少安,项爱民,李辉. 长江三峡工程库首区重力场变化与构造活动[J]. 大地测量与地球动力学,2002,22(3):56-59(Sun Shao’an, Xiang Aimin, Li Hui. Changes of Gravity Field and Tectonic Activity in Front Region of the Three-Gorges Project[J]. Journal of Geodesy and Geodynamic, 2002,22(3):56-59)
[12] 孙少安,项爱民,刘冬至,等. 三峡工程蓄水前后的精密重力测量[J]. 大地测量与地球动力学,2004,24(2):30-33 (Sun Shao’an, Xiang Aimin, Liu Dongzhi, et al. High Precise Gravity Survey before and after Impoundment of Three-Gorges Project[J]. Journal of Geodesy and Geodynamic, 2004,24(2):30-33)
[13] 邢乐林,李辉,李建国,等. 陆态网络绝对重力基准的建立及应用[J].测绘学报,2016,45(5):538-543(Xing Lelin, Li Hui, Li Jianguo, et al. Establishment of Absolute Gravity Datum in CMONOC and Its Application[J]. Acta Geodaetica et Cartographica Sinica, 2016,45(5):538-543)
[2] Barnes D F. Gravity Changes during the Alaska Earthquake[J]. Journal of Geophysical Research, 1966, 71(2): 451-456
[3] Hunt T M. Gravity Changes Associated with the 1968 Inangahua Earthquake[J]. New Zealand Journal of Geology and Geophysics, 1960, 13(4): 1 050-1 051
[4] 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 Shao’an. 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)
[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] 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 Shao’an, et al. Dynamic Variations of Gravity and the Preparation Process of the Wenchuan MS8.0 Earthquake[J]. Chinese Journal of Geophysics, 2009, 52(10): 2 547-2 557)
[7] 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)
[8] 陈运泰,顾浩鼎,卢造勋. 1975年海城地震与1976年唐山地震前后的重力变化[J]. 地震学报,1980, 2(1): 21-31(Chen Yuntai, Gu Haoding, Lu Zaoxun. Variations of Gravity before and after the Haicheng Earthquake, 1975 and the Tangshan Earthquake, 1976[J]. Acta Seismologica Sinica, 1980, 2(1): 21-31)
[9] 李瑞浩,付兆珠. 唐山地震(M=7.8)前后的区域重力变化和扩容过程[J]. 内陆地震,1987,1(4):426-434(Li Ruihao, Fu Zhaozhu. Local Gravity Variations before and after the Tangshan Earthquake(M=7.8) and the Dilatation Process[J]. Inland Earthquake, 1987, 1(4): 426-434)
[10] 申重阳. 地壳形变与密度变化耦合运动探析[J]. 大地测量与地球动力学,2005,25(3):7-12(Shen Chongyang. Preliminary Analysis of Coupling Movement between Crustal Deformation and Density Change[J]. Journal of Geodesy and Geodynamic, 2005, 25(3): 7-12)
[11] 孙少安,项爱民,李辉. 长江三峡工程库首区重力场变化与构造活动[J]. 大地测量与地球动力学,2002,22(3):56-59(Sun Shao’an, Xiang Aimin, Li Hui. Changes of Gravity Field and Tectonic Activity in Front Region of the Three-Gorges Project[J]. Journal of Geodesy and Geodynamic, 2002,22(3):56-59)
[12] 孙少安,项爱民,刘冬至,等. 三峡工程蓄水前后的精密重力测量[J]. 大地测量与地球动力学,2004,24(2):30-33 (Sun Shao’an, Xiang Aimin, Liu Dongzhi, et al. High Precise Gravity Survey before and after Impoundment of Three-Gorges Project[J]. Journal of Geodesy and Geodynamic, 2004,24(2):30-33)
[13] 邢乐林,李辉,李建国,等. 陆态网络绝对重力基准的建立及应用[J].测绘学报,2016,45(5):538-543(Xing Lelin, Li Hui, Li Jianguo, et al. Establishment of Absolute Gravity Datum in CMONOC and Its Application[J]. Acta Geodaetica et Cartographica Sinica, 2016,45(5):538-543)