南天山东段地震活动特征
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摘要
分析研究了南天山地震带构造环境、中强地震活动震源机制解、中强地震时空分布以及拜城周围小震群活动与中强地震的关系。结果表明:南天山东段中强震震源断错以倾滑逆断为主,主压应力P轴由西到东呈扇形分布;相距较近的库车与拜城地区地震活动存在较大差异,但均存在明显的成丛性分布特点;拜城地区中强地震分布呈北西向可能预示着该区存在隐伏断裂,小震群活动则可能反映了局部中强震对周围次级小构造的影响。
We analyzed and studied the structure environment, the epicenter mechanisms of medium-strong earthquakes, time and space distribution of medium-strong earthquakes and the relation between the small earthquakes clusters around Baicheng and medium-strong earthquakes in the seismic field of south Tianshan mountain. The result show, most of the medium-strong earthquakes faults are dip-slip reversed, distribution of the main stress P axis is sector from west to east; there are large difference between Kuche and Baicheng region in seismic activities, but the characteristic of cluster is same in the two region; the distribution of medium-strong earthquakes is NW direction in Baicheng region, it show, there can have a concealed fault; small earthquake clusters' activities can reflect the effect that local medium-strong earthquakes to the secondary small structure around it.
We analyzed and studied the structure environment, the epicenter mechanisms of medium-strong earthquakes, time and space distribution of medium-strong earthquakes and the relation between the small earthquakes clusters around Baicheng and medium-strong earthquakes in the seismic field of south Tianshan mountain. The result show, most of the medium-strong earthquakes faults are dip-slip reversed, distribution of the main stress P axis is sector from west to east; there are large difference between Kuche and Baicheng region in seismic activities, but the characteristic of cluster is same in the two region; the distribution of medium-strong earthquakes is NW direction in Baicheng region, it show, there can have a concealed fault; small earthquake clusters' activities can reflect the effect that local medium-strong earthquakes to the secondary small structure around it.
引文
[1]新疆维吾尔自治区地方志编纂委员会编.新疆通志.地震志[M ].乌鲁木齐:新疆人民出版社,2002.
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[3]王桂岭,韩京,缑兰兰,等.天山地震目录及中强地震震源机制解[J].内陆地震,1997,11(增刊):5—159.
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1中国地震局地质研究所.新疆牙哈凝析油气田工程场地地震安全性评价,1999.
2高国英,等.天山地区强震短期前兆特征及预报方法研究(国家“十五”科技攻关计划子专题研究报告),2003.
[2]戈澍谟.新疆地震活动特征[J].西北地震学报,1979,1(2):27—34.
[3]王桂岭,韩京,缑兰兰,等.天山地震目录及中强地震震源机制解[J].内陆地震,1997,11(增刊):5—159.
[4]国家地震局科技监测司.地震学分析预报方法程式指南[M ].北京:地震出版社,1990.
1中国地震局地质研究所.新疆牙哈凝析油气田工程场地地震安全性评价,1999.
2高国英,等.天山地区强震短期前兆特征及预报方法研究(国家“十五”科技攻关计划子专题研究报告),2003.
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