地电阻率1年尺度异常时空丛集现象与地震活动性
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摘要
研究了我国 2 3°～ 4 7°N、86°～ 12 7°E范围内 92个地电台、2 0 7个测道自建台至 1997年的地电阻率变化 ,得到以下认识 :( 1) 1976、1980～ 1981、1985～ 1986、1988、1991、1994年和 1997年全国范围 4 5 0 %～ 58 0 %的地电台显示 1年尺度地电阻率异常 (以下简称“异常高潮期”)。异常高潮期与大陆及周边MS≥ 7 1强震活动 ,MS≥ 5 0地震丛集活动、地球自转加速年份和减速过程中明显趋于加速的年份相对应 ;西北、西南和华北 -东北各区异常高潮期主要集中在上述年份 ,与各区内MS≥ 5 0地震丛集活动的年份明显对应。这表明地电阻率异常确实反应了地壳力学状态变化 ,地电阻率观测在地震预报中有实际意义。( 2 ) 1974～ 1997年的 2 4年中 ,映震异常占异常总数的 38 2 7% ,无震异常占 61 73% ,表明地电阻率观测场兆相当丰富。( 3)地球自转加速年份和减速过程中明显趋于加速年份中大陆边界动力加强 ,促成了地电阻率异常高潮期、MS≥ 7 1强震活动、MS≥ 5 0地震丛集活动年份之间的对应关系 ;中国大陆及区域性应力、构造、介质等条件对显示异常、强震活动、MS≥ 5 0地震丛集活动起了积极作用。( 4 )地电阻率异常高潮期与地震活动性、地球自转速度变化明显对应 ;强震周围异常“时空强”演化与活动构造和发震
The recorded data of earth\|resistivity from 92 geoelctrical stations (23°～47°N),(86°～127°E),in Chinese mainland,from their beginning to 1997 are studied,and the results are concluded as follows.\;(1)One\|year scale anomalies of earth\|resistivity were recorded at 45 0%～58\^0% stations in China in 1976,1980～1981,1984～1986,1988,1991,1994 and 1997(called the years as \!fastigiums of anomaly of earth\|resistivity\").The fastigiums are basically corresponding to the years of both action of M S≥7\^1 events and cluster action of M S≥5\^0 earthquakes in Chinese mainland and around as well as to the ones of acceleration of earth rotation and which was tended towards acceleration during the process of deceleration of earth rotation; And the fastigiums in the Northwest,Southwest and North\|Northeast China, were principally concentrated in those mentioned above,which were quite corresponding to the ones of cluster action of M S≥5\^0 earthquakes within 3 regions.It shows that anomalies of earth resistivity truly reacted to the variation of dynamic condition of crust and the observation of earth resistivity could play a significant role in earthquake prediction.\;(2)The anomalies with earthquakes only account for 38\^3% all anomalies in 24 years from 1974 to 1997 and yet the anomalies without earthquakes account for 61\^7%,it gives the fact that the field precursors are quite abundant in observation of earth resistivity.\;(3)The enhancement of boundary dynamic force in Chinese mainland,in the years of acceleration of earth rotation and which are tended towards acceleration during it's deceleration process,could impel the corresponding relation between the fastigiums and the years of both action of M S≥7\^1 events and cluster action of M S≥5\^0 earthquakes;The particular conditions in the Chinese mainland and within 3 regions,such as stress,structure and media,etc.,could play a important role in demonstration of anomalies,action of strong events and cluster action M S≥5\^0 earthquakes.\;(4)The 2 results,the relation between fastigiums of anomalies of earth\|resistivity,seismic activity and variation of speed of earth rotation and the relation of temporal,spatial and intensive development of anomalies around earthquake to active master structure and seismogenic mechanism,could be conductive to recognize and study the complexity of anomalies. \;(5)The leve of seismicity in fastigiums of earth resistivity in China is obvious higher in the West China than in the East China.
The recorded data of earth\|resistivity from 92 geoelctrical stations (23°～47°N),(86°～127°E),in Chinese mainland,from their beginning to 1997 are studied,and the results are concluded as follows.\;(1)One\|year scale anomalies of earth\|resistivity were recorded at 45 0%～58\^0% stations in China in 1976,1980～1981,1984～1986,1988,1991,1994 and 1997(called the years as \!fastigiums of anomaly of earth\|resistivity\").The fastigiums are basically corresponding to the years of both action of M S≥7\^1 events and cluster action of M S≥5\^0 earthquakes in Chinese mainland and around as well as to the ones of acceleration of earth rotation and which was tended towards acceleration during the process of deceleration of earth rotation; And the fastigiums in the Northwest,Southwest and North\|Northeast China, were principally concentrated in those mentioned above,which were quite corresponding to the ones of cluster action of M S≥5\^0 earthquakes within 3 regions.It shows that anomalies of earth resistivity truly reacted to the variation of dynamic condition of crust and the observation of earth resistivity could play a significant role in earthquake prediction.\;(2)The anomalies with earthquakes only account for 38\^3% all anomalies in 24 years from 1974 to 1997 and yet the anomalies without earthquakes account for 61\^7%,it gives the fact that the field precursors are quite abundant in observation of earth resistivity.\;(3)The enhancement of boundary dynamic force in Chinese mainland,in the years of acceleration of earth rotation and which are tended towards acceleration during it's deceleration process,could impel the corresponding relation between the fastigiums and the years of both action of M S≥7\^1 events and cluster action of M S≥5\^0 earthquakes;The particular conditions in the Chinese mainland and within 3 regions,such as stress,structure and media,etc.,could play a important role in demonstration of anomalies,action of strong events and cluster action M S≥5\^0 earthquakes.\;(4)The 2 results,the relation between fastigiums of anomalies of earth\|resistivity,seismic activity and variation of speed of earth rotation and the relation of temporal,spatial and intensive development of anomalies around earthquake to active master structure and seismogenic mechanism,could be conductive to recognize and study the complexity of anomalies. \;(5)The leve of seismicity in fastigiums of earth resistivity in China is obvious higher in the West China than in the East China.
引文
②杜学彬、卢 军、王志贤等 ,1999,地电中短期前兆识别、标志体系及预报方法研究
③ 桂燮泰、钱复业、金安忠等 ,1991,地电分析预报规范程序化指南 ,地电台站通讯 ,(12 ) ,2～ 9。
赵跃晨、刘小韦 ,1985 ,一种消除年变的数据方法 ,地震预测———地电方法论文集文集 ,福州 :福建科学出版社 ,139～ 144
李四光 ,1973 ,地质力学概论 ,北京 :地震出版社
赵洪声、钱兆霞、蔡静观、杨子汉、张淑蓉、龙晓帆、王绍晋、何 翔 ,1990 ,中国大陆 2 0 2 0年前地震形势及此背景下云南地震危险性研究 ,《中国在震大形势预测研究》 ,北京 :地震出版社 ,6 6～ 76
李启斌、肖兴华、李致森 ,1973 ,中国大陆强地震与地球自转角速度长期变化关系的初步分析 ,地球物理学报 ,16 ,71～ 80
傅征祥 ,1981,浅源强震分布与地球自转速率变化探讨 ,地震科学研究 ,(3) ,7～ 12
杜学彬、赵和云、陈宝智 ,1993 ,地电阻率临震突变与活断层、发震应力场 ,地震学报 ,15 (3) ,30 3～ 312
杜学彬、张新基、张 慧 ,1996 ,中国大陆水氡短临异常空间特征研究 ,地震学报 ,18(3) ,35 8～ 36 4
杜学彬、刘耀炜、倪明康 ,1997a,强震地下水动态中短临异常空间特征研究 ,地震学报 ,19(4 ) ,42 6～ 433
杜学彬、李步云、刘耀炜 ,1997b ,永登MS5 8地震多种前兆异常特征 ,西北地震学报 ,19(4 ) ,19～ 2 4
杜学彬、薛顺章、任广军 ,1999,中国大陆多种前兆异常研究及强震的尝试性预测 ,西北地震学报 ,2 1(2 ) ,113～ 12 2
③ 桂燮泰、钱复业、金安忠等 ,1991,地电分析预报规范程序化指南 ,地电台站通讯 ,(12 ) ,2～ 9。
赵跃晨、刘小韦 ,1985 ,一种消除年变的数据方法 ,地震预测———地电方法论文集文集 ,福州 :福建科学出版社 ,139～ 144
李四光 ,1973 ,地质力学概论 ,北京 :地震出版社
赵洪声、钱兆霞、蔡静观、杨子汉、张淑蓉、龙晓帆、王绍晋、何 翔 ,1990 ,中国大陆 2 0 2 0年前地震形势及此背景下云南地震危险性研究 ,《中国在震大形势预测研究》 ,北京 :地震出版社 ,6 6～ 76
李启斌、肖兴华、李致森 ,1973 ,中国大陆强地震与地球自转角速度长期变化关系的初步分析 ,地球物理学报 ,16 ,71～ 80
傅征祥 ,1981,浅源强震分布与地球自转速率变化探讨 ,地震科学研究 ,(3) ,7～ 12
杜学彬、赵和云、陈宝智 ,1993 ,地电阻率临震突变与活断层、发震应力场 ,地震学报 ,15 (3) ,30 3～ 312
杜学彬、张新基、张 慧 ,1996 ,中国大陆水氡短临异常空间特征研究 ,地震学报 ,18(3) ,35 8～ 36 4
杜学彬、刘耀炜、倪明康 ,1997a,强震地下水动态中短临异常空间特征研究 ,地震学报 ,19(4 ) ,42 6～ 433
杜学彬、李步云、刘耀炜 ,1997b ,永登MS5 8地震多种前兆异常特征 ,西北地震学报 ,19(4 ) ,19～ 2 4
杜学彬、薛顺章、任广军 ,1999,中国大陆多种前兆异常研究及强震的尝试性预测 ,西北地震学报 ,2 1(2 ) ,113～ 12 2
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