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。
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.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第4期48-50,73,共4页
Journal of Geodesy and Geodynamics
基金
公益性行业科研专项经费项目:数字化地震前兆地壳形变观测方法标准研究(2007GYB092-1)
关键词
潮汐分析
潮汐因子
相位滞后
地震形变
异常
tide analysis
tidal factor
phase lag
cruntal deformation
anomaly
