【摘要】 为研究汶川8.0级大地震前的潮汐异常变化,选取距震中400 km以内的9个定点地壳形变观测台站的观测数据,对地震前的长序列观测资料进行了潮汐分析,发现潮汐参数震前出现超出2倍方差的异常反映,且距震中距离越近,异常变化幅度越大;NS分量异常呈先远后近的现象。更多还原

【Abstract】 The data for 5 years observed at 9 fixed crustal deformation stations were used to calculate the tidal factor and phase delay series before the Wenchuan Ms8.0 earthquake.It is shown that at 7 stations there were abnomal changes before the earthquake.The nearer the station located to epicenteris,the greater of the abnormal signal.However the abnormal signal from the two stations were not obvious before the earthquak,one was Maoxian which is 100 km away from the earthquake and another was Kangding which is 200 km away from the earthquake.This fully demonstrates the complexity of earthquake precursors.更多还原