江苏及邻区中小地震能量场的时空变化分析
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摘要
采用随机能量场的概念,将地震活动能量场看作时间和空间的随机函数场,用自然正交函数展开的分析方法,研究江苏及邻区自1970年1月至2007年12月的中小地震(2.1≤ML≤4.5)能量场变化特征,以及主要典型能量场的时间"权重"系数的变化特征。结果显示:前7个典型场的展开精度为0.9244。研究区内不同构造块体的地震活动能量场强度存在明显差异,其中下扬子块体的苏中、苏南地区及南黄海海域的地震背景能量值高于其他地区;从典型场的分布来看,该区域对研究区能量场的影响也最为显著。前6个主要典型场的时间"权重"系数随时间的变化幅度与研究区大部分中强震之间在时间上存在很强的相关性。
We used the random function theory.The seismic energy fields of the Jiangsu and its neighboring areas are taken as random function of space and time from 1970 to 2007.And the natural orthogonal function has been used to analyze the time "weight" coefficients and the isogram of first several typical fields.The results show that the cumulative valve of first seventh typical fields was 0.9244;the strength of seismic energy was distinguished in different geological regions,with the strongest area in the middle and southern of Jiangsu,and the south Yellow Sea.The distribution of typical fields shows a most significant role of the area in the study of energy fields in Jiangsu and its neighboring areas.There is a strong correlation between the variation features of first several typical field time "weight" coefficients and moderate-strong earthquakes in the region.
We used the random function theory.The seismic energy fields of the Jiangsu and its neighboring areas are taken as random function of space and time from 1970 to 2007.And the natural orthogonal function has been used to analyze the time "weight" coefficients and the isogram of first several typical fields.The results show that the cumulative valve of first seventh typical fields was 0.9244;the strength of seismic energy was distinguished in different geological regions,with the strongest area in the middle and southern of Jiangsu,and the south Yellow Sea.The distribution of typical fields shows a most significant role of the area in the study of energy fields in Jiangsu and its neighboring areas.There is a strong correlation between the variation features of first several typical field time "weight" coefficients and moderate-strong earthquakes in the region.
引文
陈时军、David等,2003,新西兰地区地震活动时空分布的多重分形特征研究,地震学报,25(3):298~307。
崔笃信、刘文义,2000,经验正交函数分解在地壳垂直形变场分析中的应用,地震,20(3):82~86。
刁守中、郭爱香,1994,华北地区早期背景地震活动特征与M≥7大震危险区预测,高原地震,6(2):40~46。
国家地震局地学断面编委会,1992,上海奉贤至内蒙古阿拉善左旗地学断面说明书,北京:地震出版社。
毛田、万卫星,2005,用经验正交函数构造武汉地区电子浓度总含量的经验模式,地球物理学报,48(4):751~758。
裴韬、杨明,2003,地震空间活动异常的多尺度表示及其对强震时空要素的指示作用,地震学报,25(3):280~290。
王椿镛、张先康,1997,大别造山带的地壳结构研究,中国科学(D辑),27(3):221~226。
王周元译,1977,大地震的能通量,国外地震,4,14~20。
徐家炜,1980,郯庐断裂带的平移运动及其地质意义,国际交流地质学术论文集,第1册构造地质,地质力学.北京:地质出版社。
杨明芝、赵卫明,2004,宁夏及邻区地震活动能量场的统计分析,地震学报,26(5):516~522。
于泳、洪汉净,2003,全球大地震时空分布与动力学机制的初步研究,地学前缘,10(1),5~10。
张文佑、李阴槐,1986,中国及邻区海陆大地构造,267~278,北京:科学出版社。
郑哗、藤吉文,1989,随县-马鞍山地带地壳与上地幔结构及郯庐构造带的某些特征,地球物理学报,32(6):648~659。
Aki K.,1965,Maximum likelihood estimate of b in the formula logN=a-bMand its confidence limits,Bull Earthquake Res Inst.,Tokyo Univ.43:237~239.
Boatwright J.,1986,Teleseismic estimates of the energy radiated by shallow earthquakes,J Geophys Res,B2,2095~2111.
Gardner J.K.,Knopoff L.,1974,Is the sequence of earthquakes in southern California,with aftershocks removed,poissonian?.BSSA,64(5):1363~1367.
Hirata T.,Imoto M.,1991,Multifracal analysis of spatial distribution of microearthquakes in the Kanto Region,Geophys J Int,107:155~162.
Wang Jeen-Hwa,Lee Chung-Wein.1996,Multifracal measures of earthquakes in west Taiwan,Pure Appl Geophys,146(1):131~145.
Xu Wenyao,Kamide Y.,2004,Decomposition of daily geomagnetic variations by using method of natural orthogonal component,J.Geophys.Res.,109,A05218,doi:10.1029/2003JA 010216.
崔笃信、刘文义,2000,经验正交函数分解在地壳垂直形变场分析中的应用,地震,20(3):82~86。
刁守中、郭爱香,1994,华北地区早期背景地震活动特征与M≥7大震危险区预测,高原地震,6(2):40~46。
国家地震局地学断面编委会,1992,上海奉贤至内蒙古阿拉善左旗地学断面说明书,北京:地震出版社。
毛田、万卫星,2005,用经验正交函数构造武汉地区电子浓度总含量的经验模式,地球物理学报,48(4):751~758。
裴韬、杨明,2003,地震空间活动异常的多尺度表示及其对强震时空要素的指示作用,地震学报,25(3):280~290。
王椿镛、张先康,1997,大别造山带的地壳结构研究,中国科学(D辑),27(3):221~226。
王周元译,1977,大地震的能通量,国外地震,4,14~20。
徐家炜,1980,郯庐断裂带的平移运动及其地质意义,国际交流地质学术论文集,第1册构造地质,地质力学.北京:地质出版社。
杨明芝、赵卫明,2004,宁夏及邻区地震活动能量场的统计分析,地震学报,26(5):516~522。
于泳、洪汉净,2003,全球大地震时空分布与动力学机制的初步研究,地学前缘,10(1),5~10。
张文佑、李阴槐,1986,中国及邻区海陆大地构造,267~278,北京:科学出版社。
郑哗、藤吉文,1989,随县-马鞍山地带地壳与上地幔结构及郯庐构造带的某些特征,地球物理学报,32(6):648~659。
Aki K.,1965,Maximum likelihood estimate of b in the formula logN=a-bMand its confidence limits,Bull Earthquake Res Inst.,Tokyo Univ.43:237~239.
Boatwright J.,1986,Teleseismic estimates of the energy radiated by shallow earthquakes,J Geophys Res,B2,2095~2111.
Gardner J.K.,Knopoff L.,1974,Is the sequence of earthquakes in southern California,with aftershocks removed,poissonian?.BSSA,64(5):1363~1367.
Hirata T.,Imoto M.,1991,Multifracal analysis of spatial distribution of microearthquakes in the Kanto Region,Geophys J Int,107:155~162.
Wang Jeen-Hwa,Lee Chung-Wein.1996,Multifracal measures of earthquakes in west Taiwan,Pure Appl Geophys,146(1):131~145.
Xu Wenyao,Kamide Y.,2004,Decomposition of daily geomagnetic variations by using method of natural orthogonal component,J.Geophys.Res.,109,A05218,doi:10.1029/2003JA 010216.
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