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浅源地震反射测量法要求在高密度、大范围的波场测量数据中进行抽样,这就使得这种方法耗资巨大。因此,我们想评估一下自动布设拾震器的可行性。我们用11m宽的农耕机作为布设工具,将72个拾震器在约2s内沿一条测线布设好。将槽铁固定在农耕机的框架上,再将拾震器严格按照15cm的间隔分别固定在5根槽铁上。用作对比的传统测线与测线平行,相距约75cm,对比测线的数据可以与12m远的震源相对比。当震源设在距拾震器1m处时,由于槽铁的作用,面波非常发育,两条测线上的拾震器均检测到了这种现象。这种波动显示出与所预料的地震体波不同的相速度。不过,这种差异可以通过频率一波数过滤法使其衰减。上述结果表明:这种自动布设拾震器的方法是可行的,同时,可减少浅震测量的费用。
Shallow source seismic reflection measurements require sampling in high-density, large-scale wavefield measurements, which makes this method costly. Therefore, we would like to assess the feasibility of automatically arranging the pick-up. We used a 11m wide farming machine as a layout tool, and 72 pick-ups were laid out along a line in about 2s. The trough iron fixed on the frame of the farming machine, and then picked up the vibrator in strict accordance with the interval of 15cm were fixed on the 5 channel iron. The traditional line used for comparison is parallel to the line, at a distance of about 75 cm. The data of the comparison line can be compared with a source of 12 m. When the source was located 1m away from the pickup, the surface waves were well developed due to the action of the channel, and this phenomenon was detected by the pickups on both lines. This fluctuation shows a different phase velocity than the expected body wave. However, this difference can be attenuated by frequency-wavenumber filtering. The above results show that this method of automatically arranging the pickups is feasible and at the same time reducing the cost of shallow seismic surveys.