汶川8.0级地震前后陇南地区地震宏观异常调查及分析

Investingation and Analysis on Macroscopic Anomalies of Earthquake before and after Wenchuan M_S8.0 Earthquake in Longnan Area of Gansu Province

摘要:

根据对2008年5月12日汶川8.0级大地震前后(2008年4月1日至7月13日)甘肃省陇南地区及甘南州舟曲县宏观异常的震后现场调查结果,经过资料整理分析和挑选可靠异常现象,对其时空分布特征进行了研究。结果表明,在时间上宏观异常的数量临近地震逐渐增多,在临震前形成峰值;在空间上宏观异常的分布在高烈度区较多。对宏观异常与震源机制关系以及宏观异常对地震预测可能发挥的作用等问题进行了讨论。

Abstract:

Based on the field investigation result for the macroscopic anomalies appeared before and after Wenchuan MS8.0 earthquake on May 12,2008（from April 1,to July 13）in Longnan municipality and Zhouqu county of Gannan prefecture,Gansu province,through compilatio,analysis and selection for those data,the temporal and spatial distribution characteristics of the anomalies are researched.The result shows that amount of the macroscopic anomalies increased gradually with the time to event,and formed a peak just before the earthquake.In spatial more macroscopic anomalies distributed in higher earthquake intensity area.The relationship between the macroscopic anomalies and earthquake mechanism,as well as a possible effect for earthquake prediction are discussed also.