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中亚地区地震序列特征

THE FEATURES OF THE EARTHQUAKE SEQUENCES IN CENTRAL ASIA

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【作者】 刁桂苓李钦祖陈敬伟孙佩卿于利民

【Author】 Diao Guiling Li Qinzu Chen Jingwei Sun Peiqing Yu Limin (Seismological Bureau of Hebei Province Shijiazhuang 050021)

【机构】 河北省地震局!石家庄050021

【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

【Abstract】 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.

【基金】 国家自然科学基金
  • 【文献出处】 内陆地震 ,INLAND EARTHQUAKE , 编辑部邮箱 ,1999年01期
  • 【分类号】P315
  • 【被引频次】1
  • 【下载频次】39
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