利用层析成像的结果探讨安徽及邻区中强地震深部构造背景
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摘要
利用层析成像的最新成果,对研究区(28°～39°N,112°～124°E)的中强地震深部构造环境进行了研究,结果表明:(1)研究区中强震位置、地表地质构造和活动构造单元的划分与上地壳速度结构之间存在一定的关联性。M≥6.0地震大多数分布在上地壳高速区与低速区的交接地带或高速区,低速区内的地震活动相对较少;分布在高速区的地震,主要活动在高速区内的速度变异地带。华北平原断块的边界带及其内部是研究区内主要的中强地震活动场所,该断块西、北部的裂陷盆地带在上地壳以间断的大片低速区为特征,在与高速区的交接地带,中强地震呈带状活动,并有活动断裂带的发育。北西向展布的周口-合肥-宣城低速条带分隔大别山、鲁西-安徽高速区,北侧与高速区的交接地带中强地震活动较为活跃,可能是华北、华南两大构造区在深部构造和现代活动构造上的一条重要分界线。(2)霍山-六安地区历史中强地震和近代小震活动频繁与东大别山中部在中地壳发育低速层及存在切穿地壳的两组深断裂有关。(3)安徽的中强地震活动在深部构造上分区特征明显,依据历史地震活动重演和发震构造条件(深部)类比的原则,对安徽未来存在发生5级左右地震的危险区进行了初步判定。
By using of a new results of seismic tomography,we studied the deep tectonic backgrounds of moderate-strong earthquake beneath the region of 28°～39°N,112°～124°E.The results demonstrate:(1)There are some relationships between location of moderate-strong earthquake,upper geologic structure,compartmentalization of active structure unit and velocity structure of upper crust in the research area.Most earthquakes(M≥6.0)distributed within transitional zones between high and low velocity area or high velocity area in the upper crust,the earthquakes in low velocity were minority.The earthquakes in high velocity area were mainly occurred in variation belt.The boundary belt and its internal portion of north China plain rupture were the main active sites of moderate-strong earthquake,the basin belt in west and north rupture have characteristics with discontinuous low velocity area.Moderate-strong earthquake activivity like a belt in transitional zones between high and low velocity area.It developed activity rupture.The low velocity belts with north-west distribution in Zhoukou-Hefei-Xuancheng divide high velocity area in Debie Mountain and west Shandong-Anhui.The moderate-strong earthquake activivity in transitional zones between high velocity and north of low velocity belts.It may be the important deep structure and modern activity structure boundary in north China and south China tectonic area.(2)Historical moderate-strong earthquake and small recent earthquakes active in high frequency in the Huoshan-Liuan area.It has the relationship with low velocity layers were developed in middle crust of the eastern Dabie Mountain and two deep rupture cut through crust.(3)The moderate-strong earthquakes in Anhui have an obvious characteristics with areas at the deep structure.According to the principle that historical earthquake can recur and tectonic condition can contrast,we determined the fatalness areas that the MS 5.0 earthquakes in the future.
By using of a new results of seismic tomography,we studied the deep tectonic backgrounds of moderate-strong earthquake beneath the region of 28°～39°N,112°～124°E.The results demonstrate:(1)There are some relationships between location of moderate-strong earthquake,upper geologic structure,compartmentalization of active structure unit and velocity structure of upper crust in the research area.Most earthquakes(M≥6.0)distributed within transitional zones between high and low velocity area or high velocity area in the upper crust,the earthquakes in low velocity were minority.The earthquakes in high velocity area were mainly occurred in variation belt.The boundary belt and its internal portion of north China plain rupture were the main active sites of moderate-strong earthquake,the basin belt in west and north rupture have characteristics with discontinuous low velocity area.Moderate-strong earthquake activivity like a belt in transitional zones between high and low velocity area.It developed activity rupture.The low velocity belts with north-west distribution in Zhoukou-Hefei-Xuancheng divide high velocity area in Debie Mountain and west Shandong-Anhui.The moderate-strong earthquake activivity in transitional zones between high velocity and north of low velocity belts.It may be the important deep structure and modern activity structure boundary in north China and south China tectonic area.(2)Historical moderate-strong earthquake and small recent earthquakes active in high frequency in the Huoshan-Liuan area.It has the relationship with low velocity layers were developed in middle crust of the eastern Dabie Mountain and two deep rupture cut through crust.(3)The moderate-strong earthquakes in Anhui have an obvious characteristics with areas at the deep structure.According to the principle that historical earthquake can recur and tectonic condition can contrast,we determined the fatalness areas that the MS 5.0 earthquakes in the future.
引文
安徽省地震局编,1990,安徽地震目录(公元281～1985年),196～288,北京:中国展望出版社。
邓启东、张培震、冉勇康等,2002,中国活动构造基本特征,中国科学(D辑),32(12),1020～1029。
冯文科,1976,大别山地区构造地貌特征,地质科学,(3),266～276。
顾功叙主编,1983,中国地震目录(公元前1831～公元1969年),3～5,北京:科学出版社。
韩竹军、徐 杰、冉勇康等,2003,华北地区活动地块与强震活动,中国科学(D辑),33(supp),108～118。
刘福田、曲克信、吴华等,1986,华北地区的地震层析成像,地球物理学报,29(5),442～449。
刘福田、徐佩芬、刘劲松等,2003,大陆深俯冲带的地壳速度结构———东大别造山带深地震宽角反射/折射研究,地球物理 学报,46(3),366～372。
陆镜元、曹光暄、刘庆忠等,1992,安徽省地震构造环境分析,73～75,合肥:安徽科技出版社。
孙若昧、赵燕来、梅世蓉,1993,渤海及邻近地区的地震层析成像,地球物理学报,36(1),44～54。
孙若昧、刘福田,1995,津京唐地区地壳结构与强震的发生———IP波速度结构,地球物理学报,38(5),559～607。
谢瑞征、王恩铭、丁 政,1992,茅山地区北西向断裂与溧阳地震关系的再认识,143～149,见:《溧阳地震工作文集》,北京: 地震出版社。
徐佩芬、刘福田、王清晨等,2000,大别-苏鲁碰撞遁山带的地震层析成像研究———岩石圈三维递度结构,地球物理学报, 43(3),377～385。
胥 颐、刘福田、刘建华等,2000,天山地震带的地壳结构与强震构造环境,地球物理学报,43(2),184～193。
杨智娴、陈运泰、郑月军等,2003,双差地震定位法在我国中西部地区地震精确定位中的应用,中国科学(D辑),33(Supp), 129～134。
张国民、汪素云、李丽等,2002,中国大陆地震震源深度及其构造含义,科学通报,47(9),663～668。
张 杰、王行舟,2002,安徽历史地震震型研究,123～129,见:《纪念南京基准地震台建台70周年论文集》,北京:地震出版 社。
张 杰、王行舟、沈小七等,2003,鄂、豫、皖交界地区地震地质背景与中强地震复发特征的研究,地震地磁观测与研究,24 (6),18～25。
张 杰、王行舟、沈小七,2003,引入地震构造法的场地影响烈度地震危险性分析———以皖西六大水库坝址为例,中国地 震,19(1),33～40。
张 杰、沈小七、王行舟等,2004,安徽历史地震等震线长轴方位优势分布及地震地质意义,中国地震,20(2),152～160。
朱书俊,1992,溧阳两次地震的构造背景和发震构造,93～97,见:《溧阳地震工作文集》,北京:地震出版社。
邓启东、张培震、冉勇康等,2002,中国活动构造基本特征,中国科学(D辑),32(12),1020～1029。
冯文科,1976,大别山地区构造地貌特征,地质科学,(3),266～276。
顾功叙主编,1983,中国地震目录(公元前1831～公元1969年),3～5,北京:科学出版社。
韩竹军、徐 杰、冉勇康等,2003,华北地区活动地块与强震活动,中国科学(D辑),33(supp),108～118。
刘福田、曲克信、吴华等,1986,华北地区的地震层析成像,地球物理学报,29(5),442～449。
刘福田、徐佩芬、刘劲松等,2003,大陆深俯冲带的地壳速度结构———东大别造山带深地震宽角反射/折射研究,地球物理 学报,46(3),366～372。
陆镜元、曹光暄、刘庆忠等,1992,安徽省地震构造环境分析,73～75,合肥:安徽科技出版社。
孙若昧、赵燕来、梅世蓉,1993,渤海及邻近地区的地震层析成像,地球物理学报,36(1),44～54。
孙若昧、刘福田,1995,津京唐地区地壳结构与强震的发生———IP波速度结构,地球物理学报,38(5),559～607。
谢瑞征、王恩铭、丁 政,1992,茅山地区北西向断裂与溧阳地震关系的再认识,143～149,见:《溧阳地震工作文集》,北京: 地震出版社。
徐佩芬、刘福田、王清晨等,2000,大别-苏鲁碰撞遁山带的地震层析成像研究———岩石圈三维递度结构,地球物理学报, 43(3),377～385。
胥 颐、刘福田、刘建华等,2000,天山地震带的地壳结构与强震构造环境,地球物理学报,43(2),184～193。
杨智娴、陈运泰、郑月军等,2003,双差地震定位法在我国中西部地区地震精确定位中的应用,中国科学(D辑),33(Supp), 129～134。
张国民、汪素云、李丽等,2002,中国大陆地震震源深度及其构造含义,科学通报,47(9),663～668。
张 杰、王行舟,2002,安徽历史地震震型研究,123～129,见:《纪念南京基准地震台建台70周年论文集》,北京:地震出版 社。
张 杰、王行舟、沈小七等,2003,鄂、豫、皖交界地区地震地质背景与中强地震复发特征的研究,地震地磁观测与研究,24 (6),18～25。
张 杰、王行舟、沈小七,2003,引入地震构造法的场地影响烈度地震危险性分析———以皖西六大水库坝址为例,中国地 震,19(1),33～40。
张 杰、沈小七、王行舟等,2004,安徽历史地震等震线长轴方位优势分布及地震地质意义,中国地震,20(2),152～160。
朱书俊,1992,溧阳两次地震的构造背景和发震构造,93～97,见:《溧阳地震工作文集》,北京:地震出版社。
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