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目前国内外用在圈定永久冻土上的地球物理方法,较成熟的有地震勘探、电测深,对称四极等。地震勘探和电测深两种方法效果好,但成本十分昂贵。电测深还有个效率低的问题。近年来见有加拿大乔尼克公司,专为工程物探设计的EM_(31)、EM_(34)电磁法电阻率仪。据该公司介绍,用这种仪器进行的电磁法勘探,在圈定冻土上效果好、效率高。目前国内地质界,对永久冻土圈定的依据是:i>特征地植物;ii>钻探进尺中的难
At present, the geophysical methods used to delineate permafrost at home and abroad are more mature with seismic exploration, sounding sounding, symmetrical quadrupole and so on. Seismic exploration and electrical sounding two effective methods, but the cost is very expensive. Electrical sounding there is a problem of low efficiency. In recent years, see the Canadian Jonker company, designed for engineering geophysical EM_ (31), EM_ (34) electromagnetic resistivity meter. According to the company, electromagnetic surveys conducted with such instruments are effective in delineating frozen soil and are highly efficient. At present, the geologic community of China defines the permafrost as follows: i> characteristic plants; ii> difficulties in drilling footage