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Title:: Analysis of the Abnormity of Seismometry Index before Balinzuoqi-Alukeerqinqi M_S5.9 Earthquake in Inner Mongolia Autonomous Region in 2003

作者:: 韩晓明¹; 刘芳¹; 刘文广²; (1.内蒙古自治区地震局,呼和浩特 010010; 2.内蒙古自治区地震局乌加河地震台,内蒙古临河 015000)

Author(s):: HAN Xiao-ming¹; LIU Fang¹; LIU Wen-guang²; (1.Earthquake Administration of Inner Mongolia Autonomous Region,Huhhot 010010,Inner Mongolia,China)(2.Wujiahe Seismic Station,Earthquake Administration of Inner Mongolia Autonomous Region,Linhe 015000,Inner Mongolia,China)

Keywords:: M_S5.9 earthquake; b-value; velocity ratio(V_P/V_S); seismic spatial correlation length; Inner Mongolia

摘要:: 2003年8月16日,在内蒙古巴林左旗与阿鲁科尔沁旗交界处发生M_S5.9地震。以本次地震为研究对象,结合震中区地震地质背景,从地震活动性和震害分布特征两个方面进行了分析。根据b值、波速比(V_P/V_S)和地震空间相关长度在震前的变化,探讨了地震前震源区地下介质体的演变过程,并对此次地震的孕震过程做出了初步推断。本次地震前波速比和地震空间相关长度的变化规律对该区域未来中强地震预测有一定借鉴意义。

Abstract:: On August 16,2003,an M_S5.9 earthquake occurred in the bordering area of Balinzuoqi and Alukeerqinqi,Inner Mongolia Autonomous Region.We analyze the seismic activity and the distribution of earthquake disaster on the basis of the seismological settings in the earthquake area.By analyzing the variation of b-value,velocity ratio(V_P/V_S)and correlation length before the earthquake event,we discuss the evolvement of underground media in the hypocentral area before earthquake event and preliminarily deduce the seismogenic process of the earthquake.The variation regularity of these three indexes can serve for forecasting the future medium-and strong-earthquakes in this region.