中亚地区地震序列特征
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摘要
共搜集到１９７０～１９８４年中亚地区８ 个地震序列。通过分析这些板块内部地震序列的震源分布、震源机制，归纳出它们的特征是：震中分布的长轴都比较短，震中分布长轴和短轴的比值小；长轴的方向受当地地震带的走向控制，和碰撞带走向无关。地震序列中各地震的震源深度都比较浅。其中有震源机制资料的３ 个地震序列表明：主震的震源机制如果是逆冲滑动，倾角则比较低；主震的震源机制如果是走向滑动，倾角则比较高。不论主震的震源机制是倾滑，还是走滑，余震的震源机制和主震的震源机制一致性较差
The data of 8 earthquake sequences in Central Asia during the period of 1970~1984 are collected.By analyzing the hypocenter distribution and focal mechanisms of these intraplate earthquake sequences,their features have been drawn:the major axis of the epicenter area is shorter and the ratio of major axis to minor axis is less than those of the interplate earthquake;the direction of the major axis is controlled by the trend of local seismic zone and independent on the trend of collision zone;the hypocenters of all earthquake sequences are shallow;focal mechanism solutions are collected for only three earthquake sequences and they show lower dip for the reverse slip type mainshock,higher dip for the strik slip type mainshock;the consistency is bad between the focal mechanisms of mainshocks and aftershocks whether the focal mechanisms of mainshocks are reverse slip type or strike slip type.
The data of 8 earthquake sequences in Central Asia during the period of 1970~1984 are collected.By analyzing the hypocenter distribution and focal mechanisms of these intraplate earthquake sequences,their features have been drawn:the major axis of the epicenter area is shorter and the ratio of major axis to minor axis is less than those of the interplate earthquake;the direction of the major axis is controlled by the trend of local seismic zone and independent on the trend of collision zone;the hypocenters of all earthquake sequences are shallow;focal mechanism solutions are collected for only three earthquake sequences and they show lower dip for the reverse slip type mainshock,higher dip for the strik slip type mainshock;the consistency is bad between the focal mechanisms of mainshocks and aftershocks whether the focal mechanisms of mainshocks are reverse slip type or strike slip type.
引文
1 李钦祖,BoltBA.1979 年美国加州凯奥蒂湖地震序列震源机制分析:美国加州地震比中国大陆地震破裂过程简单的证据.地球物理学报,1992,35(2):160～173.
2 金性春.板块构造学基础.上海:上海科学技术出版社,1984.
3 刁桂苓,于利民,李钦祖.震源机制解的系统聚类分析.中国地震,1992,8(3):86～91.
4 Scholz CH, Aviles C,Wesnousky S.Scaling differences betw een large intraplate and interplate earthquakes.Bull. Seism ol.Soc.Am .,1986,76:65～70.
5 郑斯华,铃木次郎.西藏高原及其周围地区地震的地震矩张量及震源参数的尺度关系.地震学报,1992,14(4):423～434
2 金性春.板块构造学基础.上海:上海科学技术出版社,1984.
3 刁桂苓,于利民,李钦祖.震源机制解的系统聚类分析.中国地震,1992,8(3):86～91.
4 Scholz CH, Aviles C,Wesnousky S.Scaling differences betw een large intraplate and interplate earthquakes.Bull. Seism ol.Soc.Am .,1986,76:65～70.
5 郑斯华,铃木次郎.西藏高原及其周围地区地震的地震矩张量及震源参数的尺度关系.地震学报,1992,14(4):423～434
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