鄂尔多斯活动地块周缘几次Ms6级地震前Ms4级地震活动的异常特征
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摘要
简要地分析了鄂尔多斯活动地块周缘断陷盆地构造和历史地震分布特征,界定了鄂尔多斯活动地块周缘范围,以此范围选取了Ms4级地震资料。对比研宄了鄂尔多斯活动地块周缘几次Ms6级震例前Ms4级地震活动的时间分布和空间分布特点,研究结果显示:Ms4级地震活动在6级地震前时间上出现活跃—平静—打破平静的异常特征,空间上6级地震发生在4级地震活跃地区或4级地震的平静地区。在此基础上,给出了几次Ms6级震例前Ms4级地震显著活跃的震兆意义和需讨论的问题。
In this paper,the author briefly analyzed the characteristics of the fault basin structure and the distribution of historical earthquakes along the Ordos active block,and defined the scope of the margin of the Ordos active block.The seismic data of Ms≥4 are selected within the scope,and temporal-spatial distribution of M≥4 earthquakes before several Ms≥6 historical earthquake cases was comparatively studied.The results show that temporally,before Ms6 occurrence,Ms≥4 earthquakes obviously presented anomalous characteristics of activity—quiet—quiet-break,and from the space pattern Ms6 occurred in the active or quiet area of Ms4 earthquakes.On this basis,the pre-seismic significance of Ms≥4 earthquakes and some questions were presented.
In this paper,the author briefly analyzed the characteristics of the fault basin structure and the distribution of historical earthquakes along the Ordos active block,and defined the scope of the margin of the Ordos active block.The seismic data of Ms≥4 are selected within the scope,and temporal-spatial distribution of M≥4 earthquakes before several Ms≥6 historical earthquake cases was comparatively studied.The results show that temporally,before Ms6 occurrence,Ms≥4 earthquakes obviously presented anomalous characteristics of activity—quiet—quiet-break,and from the space pattern Ms6 occurred in the active or quiet area of Ms4 earthquakes.On this basis,the pre-seismic significance of Ms≥4 earthquakes and some questions were presented.
引文
[1]国家地展局《鄂尔多斯活动地块周缘活动断裂系》课题组.鄂尔多斯活动地块周缘活动断裂系[M].北京:地震出版社,1988:10-280.
[2]陆远忠,李胜乐,邓志辉,等.基于GIS的地震分析预报系统[M].成都:成都地图出版社,2002:1-10.
[3]薛丁,曹刚,纪建国,等.华北北部地区3组中强地震成组活动特征研究[J].山西地震,2006(4):5-7.
[4]薛丁,燕志强,刘芳,等.阴山地震带中强地震的活动特征[J].山西地震,2001(2):17-24.
[5]薛丁,徐建德,阎海滨,等.山西北部至晋冀蒙交界地区几次中强地震前4级地震活动的研究[J].山西地震,2002(4):17-21.
[6]薛丁,朱学健,王祯祥.内蒙古和林格尔6.3级地震前地震的空段异常[J].山西地震,2004(2):23-25.
[7]薛丁,孙加林.包头西6.4级震前地震活动研究[J].高原地震,1997,19(1):46-51.
[8]薛丁.包头西6.4级地震前显著中等地震活动增强和从集异常[J].地震,2003,23(4):71-76.
[2]陆远忠,李胜乐,邓志辉,等.基于GIS的地震分析预报系统[M].成都:成都地图出版社,2002:1-10.
[3]薛丁,曹刚,纪建国,等.华北北部地区3组中强地震成组活动特征研究[J].山西地震,2006(4):5-7.
[4]薛丁,燕志强,刘芳,等.阴山地震带中强地震的活动特征[J].山西地震,2001(2):17-24.
[5]薛丁,徐建德,阎海滨,等.山西北部至晋冀蒙交界地区几次中强地震前4级地震活动的研究[J].山西地震,2002(4):17-21.
[6]薛丁,朱学健,王祯祥.内蒙古和林格尔6.3级地震前地震的空段异常[J].山西地震,2004(2):23-25.
[7]薛丁,孙加林.包头西6.4级震前地震活动研究[J].高原地震,1997,19(1):46-51.
[8]薛丁.包头西6.4级地震前显著中等地震活动增强和从集异常[J].地震,2003,23(4):71-76.
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