民乐6.1级、岷县5.2级地震前区域重力场变化
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摘要
通过对青藏高原东北缘重力观测资料进行系统分析,从动态的观点研究了2003年10月25日甘肃民乐 6.1及5.8级地震和11月13日甘肃岷县5.2级地震孕育发生过程中的重力场演化特征,得到如下结论:①从统一 起算基准获得的青藏高原东北缘重力观测资料,较完整地反映了2003年10月25日发生的民乐6.1级、5.8级地 震和11月13日发生的岷县5.2级地震孕育、发生过程中出现的流动重力前兆信息;②小波分解的重力场图像能较 清晰地反映地震孕育、发生过程中区域性重力趋势变化和震中地区深部物质密度变化引起的异常。
In this paper, the gravity observations in the northeastern margin of Qinghai-Tibet plateau area are analyzed, the evolution characteristics of gravity field in the seismogenic process of the Minle,earthquake on Oct. 25,2003 and the Minxian, earthquake on Nov. 13,2003 are studied from the dynamic viewpoint and the following conclusions are drawn: ①the gravity observation data of the northeastern margin of Qinghai-Tibet plateau obtained by use of uniform starting criteria can express the precursory gravity information during the seismogenic process of these earthquakes;②the dynamic patterns of gravity field through the multi-scale wavelet decomposition mirror clearly the tendentious local gravity variation and the anomalies caused by the material density variation in the depth of focal region during the seismogenic process of these earthquakes.
In this paper, the gravity observations in the northeastern margin of Qinghai-Tibet plateau area are analyzed, the evolution characteristics of gravity field in the seismogenic process of the Minle,earthquake on Oct. 25,2003 and the Minxian, earthquake on Nov. 13,2003 are studied from the dynamic viewpoint and the following conclusions are drawn: ①the gravity observation data of the northeastern margin of Qinghai-Tibet plateau obtained by use of uniform starting criteria can express the precursory gravity information during the seismogenic process of these earthquakes;②the dynamic patterns of gravity field through the multi-scale wavelet decomposition mirror clearly the tendentious local gravity variation and the anomalies caused by the material density variation in the depth of focal region during the seismogenic process of these earthquakes.
引文
1 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,1999,19(1):71～77.
1 ZhuYiqing,HuBin,ZhangYongzhi.Studyofthedynam icpatterncharacteristicsofgravityaroundYongdeng earthquake[J].CrustalDeformationandEarthquake,1999,19(1):71-77.(inChinese)
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2 ZhuYiqing,ChenBing,ZhangXi,etal.Gravityvariation researchbeforeandafterJingtaiMs5.9earthquake[J].EarthquakeResearchinChina,2001,17(4):356-363.(inChinese)
3 祝意青,李辉,朱桂芝,等.青藏块体东北缘重力场演化与地震活动[J].地震学报,2004,26(6).
3 ZhuYiqng,LiHui,ZhuGuizhi,etal.Gravityevolution andearthquakeactivitiesofthenortheasternedgeofQinghaiTibetblock[J].ActaSeismologicaSinica,2004,17(6).3
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6 WanYongge,QiFurong,MengXioachun,etal.Wavelet analysisofseismicdatainChinesemainlandandNorthChina[J].JournalofGeodesyandGeodynamics,2003,23(4):28-33.(inChinese)
7 张燕,吴云,刘永启,等.潮汐形变资料中地震地震前兆信息的识别与提取[J].大地测量与地球动力学,2003,23(4):34～39.
7 ZhangYan,WuYun,LiuYongqi,etal.Identificationand extractionofearthquakeprecursorfromtidaldeformation data[J].JournalofGeodesyandGeodynamics,2003,23(4):34-39.(inChinese)
8 方盛明,张先康,嘉世旭,等.华北地区布格重力异常的多尺度分解特征与地震活动性[J].大地测量与地球动力学,2002,22(1):34～39.
8 FangShengming,ZhangXiankang,JiaShixu,et.al.Multi scaledecompositionofbouguergravityanomaly andseismicactivityinnorthChina[J].JournalofGeod esyandgeodynamics,2002,22(1):34-39.(inChinese)
9 朱桂芝,祝意青,唐文,等.河西地区重力动态变化二维离散小波多尺度分解[J].大地测量与地球动力学,2004,24(1):46～49.
9 ZhuGuizhi,ZhuYiqing,TangWen,etal.Multi scalede compositionof2Ddiscretewaveletongravitydynamic variationinHexiregion[J].JournalofGeodesyandGeo dynamics,2004,24(1):46-49.(inChinese)
10 刘少明,申重阳,孙少安,等.小波多尺度分解特征分析[J].大地测量与地球动力学,2004,24(2):34～41.
10 LiuShaoming,ShenZhongyang,SunShaoan,etal.A nalysisofcharacteristicsofwaveletmulti scaledecom position[J].JournalofGeodesyandGeodynamics,2004,24(2):34-41.(inChinese)
1 ZhuYiqing,HuBin,ZhangYongzhi.Studyofthedynam icpatterncharacteristicsofgravityaroundYongdeng earthquake[J].CrustalDeformationandEarthquake,1999,19(1):71-77.(inChinese)
2 祝意青,陈兵,张希,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.
2 ZhuYiqing,ChenBing,ZhangXi,etal.Gravityvariation researchbeforeandafterJingtaiMs5.9earthquake[J].EarthquakeResearchinChina,2001,17(4):356-363.(inChinese)
3 祝意青,李辉,朱桂芝,等.青藏块体东北缘重力场演化与地震活动[J].地震学报,2004,26(6).
3 ZhuYiqng,LiHui,ZhuGuizhi,etal.Gravityevolution andearthquakeactivitiesofthenortheasternedgeofQinghaiTibetblock[J].ActaSeismologicaSinica,2004,17(6).3
4 祝意青,胡斌,朱桂芝,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.2003,23(4):44～48.
4 ZhuYiqing,HuBin,ZhuGuzhi,etal.Studyongravity fieldanditsdynamicevolutionalcharacteristicsinHexi area[J].JournalofGeodesyandGeodynamics,2003,23(4):44-48.(inChinese)
5 宋治平,武安绪,王梅,等.小波分析方法在形变数字化资料处理中的应用[J].大地测量与地球动力学,2003,23(4):21～27.
5 SongZhiping,WuAnxu,WangMei,etal.Applicationof wavelettransformtoanalysisofdigitaldeformationdata[J].JournalofGeodesyandGeodynamics,2003,23(4):21-27.(inChinese)
6 万永革,齐福荣,孟晓春,等.中国大陆及华北地区地震资料的小波分析[J].大地测量与地球动力学,2003,23(4):28～33.
6 WanYongge,QiFurong,MengXioachun,etal.Wavelet analysisofseismicdatainChinesemainlandandNorthChina[J].JournalofGeodesyandGeodynamics,2003,23(4):28-33.(inChinese)
7 张燕,吴云,刘永启,等.潮汐形变资料中地震地震前兆信息的识别与提取[J].大地测量与地球动力学,2003,23(4):34～39.
7 ZhangYan,WuYun,LiuYongqi,etal.Identificationand extractionofearthquakeprecursorfromtidaldeformation data[J].JournalofGeodesyandGeodynamics,2003,23(4):34-39.(inChinese)
8 方盛明,张先康,嘉世旭,等.华北地区布格重力异常的多尺度分解特征与地震活动性[J].大地测量与地球动力学,2002,22(1):34～39.
8 FangShengming,ZhangXiankang,JiaShixu,et.al.Multi scaledecompositionofbouguergravityanomaly andseismicactivityinnorthChina[J].JournalofGeod esyandgeodynamics,2002,22(1):34-39.(inChinese)
9 朱桂芝,祝意青,唐文,等.河西地区重力动态变化二维离散小波多尺度分解[J].大地测量与地球动力学,2004,24(1):46～49.
9 ZhuGuizhi,ZhuYiqing,TangWen,etal.Multi scalede compositionof2Ddiscretewaveletongravitydynamic variationinHexiregion[J].JournalofGeodesyandGeo dynamics,2004,24(1):46-49.(inChinese)
10 刘少明,申重阳,孙少安,等.小波多尺度分解特征分析[J].大地测量与地球动力学,2004,24(2):34～41.
10 LiuShaoming,ShenZhongyang,SunShaoan,etal.A nalysisofcharacteristicsofwaveletmulti scaledecom position[J].JournalofGeodesyandGeodynamics,2004,24(2):34-41.(inChinese)
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