A Statistical Analysis on the Wenchuan Aftershock Activity Triggered by Earth Tide  

作　　者：Li Jin Jiang Haikun 

机构地区：[1]Earthguake Administration of Xinjiang Uygur Autonomous Region [2]China Earthquake Networks Center

出　　处：《Earthquake Research in China》2013年第1期23-38,共16页中国地震研究（英文版）

基　　金：sponsored by the National Key Technology R&D Program,China(2008BAC38B03)

摘　　要：A statistical analysis on the Wenchuan aftershock activity triggered by tidal forces is systematically studied based on Schusters test, including earthquakes triggered by tidal force, tidal stress and tidal coulomb failure stress. The results show that a group of strong aftershocks which occurred at the end of July to early August in 2008 at the north of Wenchuan were obviously triggered by earth tide, the same conclusion is drawn by Schusters smooth test of the tidal force, tidal stress and tidal coulomb failure stress. In addition, the Wenchuan aftershock activity is obviously triggered by fortnight tide. In the north, the aftershocks happened more frequently in the first and last quarters of the moon, and in the south, the aftershocks happened more frequently in the first and last quarters of the moon and during the full moon.A statistical analysis on the Wenchuan aftershock activity triggered by tidal forces is systematically studied based on Schuster＇s test, including earthquakes triggered by tidal force, tidal stress and tidal coulomb failure stress. The results show that a group of strong aftershocks which occurred at the end of July to early August in 2008 at the north of Wenchuan were obviously triggered by earth tide, the same conclusion is drawn by Schuster＇s smooth test of the tidal force, tidal stress and tidal coulomb failure stress. In addition, the Wenchuan aftershock activity is obviously triggered by fortnight tide. In the north, the aftershocks happened more frequently in the first and last quarters of the moon, and in the south, the aftershocks happened more frequently in the first and last quarters of the moon and during the full moon.

关 键 词：Wenchuan aftershocks Tidal triggering Schuster＇s test 

分 类 号：P315[天文地球—地震学]