oa A method suited to survey of shallow high resolution Survey and survey in busy streets of a city — Landsoner

Landsoner is the abbreviation of extremely elastic reflection wave recording continues profiling with extremely small offset and vary wide band frequency. It has following characteristics: (a) Small-offset single is used; (b) Under situation of using hammer source can be excited and be received reflection wave with frequency 10Hz-4000Hz of depth of 1 ~ 200m; (c) It is unnecessary that the geophones f ixed on the ground. On this characteristics the wave with different frequency band can be got that can greatly rise resolution, and can keep away from the noise of acoustic wave, direct wave, reflected wave, surface wave, specially can keep away from the noise of vibration of pedestrians, cars and the other machines on a city. When using landsoner method survey line with broken line can be used. There is no need to statics in mountainous region for this method. On the time-section of figure of Landsoner a karst cave can clearly be reflected. Landsoner method has been successfully used in shallow high resolution survey in mountainous region or in a busy city, in survey karst caves, in geological prediction forward from working face in a tunnel construction and in examining quality ofconcrete structures.