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探测冻土上限位置,并对其动态变化进行监视,是研究多年冻土地区建筑物热状况、制定稳定性措施的最基本工作之一。 DS-4型轻便地震仪仿加拿大FS-3型工程地震仪,是根据反射波的视速度一般大
Detecting the upper limit of permafrost and monitoring its dynamic changes are one of the most basic tasks in studying the thermal status of buildings in permafrost regions and making stability measures. DS-4 portable seismograph imitation Canada FS-3-type engineering seismometer, is based on the apparent velocity of the reflected wave