汶川8.0级地震及强余震破裂方式与引潮力之间的关系  

On Tidal Force Triggering of the Wenchuan M_S8.0 Earthquake and its Strong Aftershocks

作　　者：陈大庆[1] 杨马陵[1] 刘锦[1] 

机构地区：[1]广东省地震局预报研究中心,广东广州510070

出　　处：《地震》2011年第2期24-32,共9页Earthquake

基　　金：2009年度震情跟踪合同制定向工作项目(2009020301;2009010107)资助

摘　　要：本文通过计算汶川8.0级主震及20次MS≥5.0强余震发震时刻引潮力的方位、大小及变化率,并对比其破裂方式,发现11次逆冲型地震其发震时刻的水平引潮力方位和主压应力轴P轴有6次夹角在33°之内;8次走滑型地震,其发震时刻垂向引潮力都处于向上的峰值区间;而2次具有张性正断分量的地震,发震时刻垂向引潮力都处于向下的峰值区间。根据以上的统计特征,本文就引潮力对三种破裂类型在汶川主震及强余震中可能的触发机制进行了探讨。By calculating the azimuth,phase angle and change rate of tide force at the times of occurrences of the Wenchan MS8.0 earthquake and 20 MS≥5.0 aftershocks,and contrasting with their rupture types,we find that the angles between the direction of the horizontal tidal and compressive principal stress are within 33° for 6 earthquakes in 11 reverse earthquakes.All of the vertical phase angles of 8 strike-slip earthquakes are in the up peak period,and 2 normal earthquakes′ vertical phase angles are in the downward peak.Based on statistical phenomenon,we discussed the mechanism of tidal force triggering of the Wenchuan MS8.0 Earthquake and its strong aftershocks.

关 键 词：汶川地震 强余震 引潮力 触发机制 

分 类 号：P315.7[天文地球—地震学]