川西地下流体化学组分观测与中强震关系
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摘要
研究川西地下流体化学各观测组分的异常特征及其与中强震的对应关系发现 :四川及邻区 5 5级以上中强地震前 1～ 2年 ,均能观测到地下流体化学层次跟踪方法发生异常 ;在观测台点较多的地区 ,中强地震前 1年时间内 ,可观测到 2个以上台项地下流体化学形态异常及短临异常 ;地下流体化学异常与地震的对应关系较好 ;地下流体化学异常台项比在很大程度上受震中附近水化观测台项多少及其台点分布均匀与否的影响 ,其大小往往不能客观反映川西地下流体化学异常与地震对应关系。
Researching the abnormal changes characteristic of ground water elements and the seismic activities in Sichuan and nearby regions, we find that within 1～2 years before an Ms5 5 earthquake, the chemical element changes in ground water are able to be measured and in the area of intensive observing stations, two items in the chemical element changes in ground water and the short impending abnormal changes are able to be measured before a medium or strong earthquake one year Abnormal changes goes well with seismic events But the distribution of the observing stations which may result in a wrong conclusion should be carefully studied
Researching the abnormal changes characteristic of ground water elements and the seismic activities in Sichuan and nearby regions, we find that within 1～2 years before an Ms5 5 earthquake, the chemical element changes in ground water are able to be measured and in the area of intensive observing stations, two items in the chemical element changes in ground water and the short impending abnormal changes are able to be measured before a medium or strong earthquake one year Abnormal changes goes well with seismic events But the distribution of the observing stations which may result in a wrong conclusion should be carefully studied
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