攀枝花6.1、姚安6.0级地震前后区域重力场变化
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摘要
利用滇西地区重力观测资料,研究2008年8月30日四川攀枝花6.1级地震和2009年7月9日云南姚安6.0级地震前后区域重力场的动态演化特征。结果表明:重力观测资料较完整地反映了攀枝花6.1、姚安6.0地震孕育、发生过程中出现的流动重力前兆信息;重力场动态图像较清晰地反映了重力场由准均匀态-地震孕育到非均匀态-发震的演化过程。据此,对攀枝花6.1级地震后的地震趋势作了判定,并在姚安6.0级地震前作了年度预报。
The repeatedly gravimetric data in western area of Yunnan Province are analyzed.The dynamic evolution characteristics of gravity field in the seismogenic process of the Panzhihua Ms6.1 earthquake on Aug.30,2008 in Sichuan Province and Yaoan Ms6.0 on Jul.9,2009 in Yunnan Province are studied and the following conclusions are drawn.1)The gravity observations reflected the precursory gravity information during the seismogenic process,the dynamic evolution pattern of gravity reflects clearly the gravity field's evolution of "quasi-homogeneous→heterogeneous then earthquake→quasi-homogeneous" in the process of the Pabzhihua Ms6.1 and Yaoan Ms6.0 earthquakes.2)The tendency after Panzhihua Ms6.1 earthquake are estimated and the annual prediction before Yaoan Ms6.0 earthquake are made.
The repeatedly gravimetric data in western area of Yunnan Province are analyzed.The dynamic evolution characteristics of gravity field in the seismogenic process of the Panzhihua Ms6.1 earthquake on Aug.30,2008 in Sichuan Province and Yaoan Ms6.0 on Jul.9,2009 in Yunnan Province are studied and the following conclusions are drawn.1)The gravity observations reflected the precursory gravity information during the seismogenic process,the dynamic evolution pattern of gravity reflects clearly the gravity field's evolution of "quasi-homogeneous→heterogeneous then earthquake→quasi-homogeneous" in the process of the Pabzhihua Ms6.1 and Yaoan Ms6.0 earthquakes.2)The tendency after Panzhihua Ms6.1 earthquake are estimated and the annual prediction before Yaoan Ms6.0 earthquake are made.
引文
[1]中国地震局第二监测中心2009年度地震趋势研究报告[R].2008.
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11Kuo J T,Zheng J Hand Song S H.Determination of earth-quake epicentroids by inversion of gravity variation data in the BTTZ region,China[J].Tectonophysics,1999,312(2):267-281.
1贾民育,邢灿飞,孙少安.滇西重力变化的二维图像及其与5级以上地震的关系[J].地壳形变与地震,1995,(3):9-19.(Jia Minyu,Xing Canfei and Sun Shaoan.Two dimension pictures of gravity change in Westen Yunnan and their relations to the earthquakesM>5.0[J].Crustal de-formation and earthquake,1995,(3):9-19)
2孙少安,项爱民,李辉.滇西与北京区域重力场演化及其与地震关系的探讨[J].地震,1999,19(1):97-105.(Sun Shaoan,Xia Aiming and Li Hui.Evolution of the grav-ity fileds and its relation with earthquak in the areas of West-en Yunnan and Beijing[J].Earthquake,1999,19(1):97-105)
3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,(2):51-55.(Xu Yunma,Zhu Yiqing and Cheng Hongbin.Relations between changes of gravity field andMs≥6.0earthquake in Western Yunnan during1998-2004[J].Journal of Geodesy and Geodynamics,2008,(2):51-55)
4申重阳,李辉,付广裕.丽江7.0级地震重力前兆模式研究[J].地震学报,2003,25(2):163-171.(Shen Chongyang,Li Hui and Fu Guangyu.Study on gravity pre-cursor mode of theMs7.0Lijiang earthquak[J].Acta Seis-mologica Sinica,2003,25(2):163-171)
5祝意青,胡斌,张永志.永登5.8级地震前后的重力场动态图像特征研究[J].地壳形变与地震,1999,(1):71-77.(Zhu Yiqing,Hu Bin and Zhang Yongzhi.Study of thedynamic pattern characteristics of gravity aroud Yongdeng earthquake[J].Crustal Deformation and Earthquake,1999,(1):71-77)
6祝意青,等.景泰5.9级地震前后的重力变化研究[J].中国地震,2001,17(4):356-363.(Zhu Yiqing,et al.Gravity variation research before and after JingtaiMs5.9earthquake[J].Earthquake Research in China,2001,17(4):356-363).
7祝意青,等.河西地区重力场及其动态演化特征[J].大地测量与地球动力学.2003,(4):44-48.(Zhu Yiqing,et al.Study on gravity field and its dynamic evolutional char-acteristics in Hexi Area[J].Journal of Geodesy and Geody-namics,2003,(4):44-48)
8祝意青,等.民乐6.1、岷县5.2级地震前区域重力场变化[J].大地测量与地球动力学,2005,(1):24-29.(Zhu Yiqing,et al.Variation of Gravity Field before MinleMs6.1and Minxian Ms5.2Earthquakes[J].Journal of Geodesy and Geodynamics,2005,(1):24-29)
9顾功叙,等.中国京津唐张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):1919-1930.(Gu Gongxu,et al.Seismogenesis and oc-currence of earthquakes as observed by temporally continu-ous gravity variations in China[J].Chinese Science Bulle-tin,1997,42(18):1919-1930)
10Chen Y T,Gu HD and Lu Z X.Variations of gravity be-fore and after the haicheng earthquake,1975,and the tan-gshan earthquake,1976[J].Physics of the Earth and Planetary Interiors,1979,18,330-338.
11Kuo J T,Zheng J Hand Song S H.Determination of earth-quake epicentroids by inversion of gravity variation data in the BTTZ region,China[J].Tectonophysics,1999,312(2):267-281.
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