Abstract The changes of some precursory observation in Shanxi area before Wenchuan \%M\%s8.0 earthquake on May 12,2008 were analysed, and following conclutions are drawn. Firstly,the precursor waves of low frequent are main characters of the precursory change before the earthquake, and its superior period are 64-128 min.Secondly,the distribution of the abnormal points is in the same direction with the primary rupture of Wenchuan Ms8.0 earthquake.Thirdly, lowfrequency precursory waves occured in a crowded time, mainly from 14 to 16 o’clock on the May 11 and the precursory observation’s ability to respond to the precursory waves is related with the rock’s mechanics nature of the observation point, the frequency characteristics of the observation apparatuses, and tectonic locations where the observations points are located.
Zhang Shuliang,Liu Ruichun,Ning Yaling et al. ANALYSIS OF CHARACTERISTICS OF PRECURSOR WAVE OF LOW FREQUENT IN SHANXI BEFORE WENCHUAN Ms8.0 EARTHQUAKE[J]. , 2009, 29(6): 35-39.
Zhang Shuliang,Liu Ruichun,Ning Yaling et al. ANALYSIS OF CHARACTERISTICS OF PRECURSOR WAVE OF LOW FREQUENT IN SHANXI BEFORE WENCHUAN Ms8.0 EARTHQUAKE[J]. jgg, 2009, 29(6): 35-39.
