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地震 ›› 2003, Vol. 23 ›› Issue (4): 71-76.

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包头西6.4 级地震前显著中等地震活动增强和丛集异常

薛丁   

  1. 内蒙古自治区地震局, 内蒙古呼和浩特 010051
  • 收稿日期:2002-10-15 修回日期:2002-12-20 出版日期:2003-10-31 发布日期:2021-12-21
  • 作者简介:薛丁( 1963-), 男, 内蒙古呼和浩特人, 高级工程师, 2002 年获硕士学位, 主要从事地震预报、地震活动性等研究。

Obvious intensifying and swarming anomaly of moderate seismic activity before west Baotou earthquake with M =6.4

XUE Ding   

  1. Seismological Bureau of Inner Mongolia Autonomous Region, Hohhot 010051, China
  • Received:2002-10-15 Revised:2002-12-20 Online:2003-10-31 Published:2021-12-21

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摘要： 1996 年包头西6.4 级地震前, 在震中西部临河盆地出现了显著的中等地震活动增强和丛集异常, 而且中等地震活动在时间上也表现出了集中的特征。其中5 次中等地震强烈有感, 引起了地震学者高度的重视, 这是一次显著的地震活动中期异常。但是, 主震是在距离异常区200 km 以外的地方发生, 造成了震前地点预测误差较大的问题。文中详细描述了这次中等地震活动异常的情况, 并且通过震区地震地质构造条件分析, 探讨了主震发生在距离异常区较远的原因, 这对今后地震预测有一定的指导意义。

关键词: 包头西6.4 级地震, 中等地震, 增强和丛集异常, 地震预测

Abstract: Before West Bao tou MS6.4 earthquake occurred on May 3rd 1996, in the western part of epicenter in Linhe basin, the obvious intensifying and sw arming anomaly of moderate earthquake act ivity appeared, besides, the time sequence of moderate earthquakes is also characterized by concent ration.The five ones among these moderate earthquakes are st rong ly felt so w e paid more at tention to these event s.It is a remarkable medium term anomaly of seismici ty. Unfo rtunately, the main shock w as not near the anomalous area;i t occurred in the area farther aw ay f rom the anomaly point 200 km or so.This phenomenon resulted in our w ro ng prediction of earthquake place.In the paper, the autho r described the details of moderate earthquake activity.In addition to this, by analyzing the tectonics of Linhe basin, the author also discussed the reason w hy main shock occurred farther aw ay from the anomalous place.Undoubtedly, it is of significance in our earthquake predict ion in the future.

Key words: MS6.4 earthquake in West Baotou, Moderate earthquake, Anomaly of intensifying and sw arming, Earthquake prediction

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