CAJ | 학술논문

对汶川Ms8.0地震前山西地区前兆测项变化进行了分析,认为震前前兆变化主要以低频前驱波为特征,其波动的优势周期为64～128分钟;异常点的展布方向与汶川地震主破裂方向一致;低频前驱波出现的时间具有丛集性特点,主要集中在5月11日14时至16时;研究还发现前兆测项对前驱波的响应能力与测点岩石的力学性质、观测仪器的频率特征、测点所处的构造部位有一定的关系.
대문천Ms8.0지진전산서지구전조측항변화진행료분석,인위진전전조변화주요이저빈전구파위특정,기파동적우세주기위64～128분종;이상점적전포방향여문천지진주파렬방향일치;저빈전구파출현적시간구유총집성특점,주요집중재5월11일14시지16시;연구환발현전조측항대전구파적향응능력여측점암석적역학성질、관측의기적빈솔특정、측점소처적구조부위유일정적관계.
The changes of some precursory observation in Shanxi area before Wenchuan Ms8.0 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, low-frequency 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.