Seismic trenching by shallow hi-resolution seismic reflection method

本研究的目的是建立“浅层高分辨率地震反射法地震槽探”系统。该系统由Yuatsu撞击器（震源）和iXL（数据处理）组成。前者是在本研究项目开始之前的1993年由千叶大学、GSI和三菱Juko合作完成的。后者是由这笔赠款编写的。本系统的改进主要有以下几点：1.为了节省炮点和接收点的测量时间，将全站仪和DGPS系统结合起来，采用了联合收割机。2.地震探槽法要求炮点和接收点分布密集，因此，地震探槽法的优点是：1.可以在短时间内获得测量结果，并将其顺利地输入到iXL中。这不可避免地带来了线和电缆的缠结。因此，我们取消了冲击器上的触发电缆，并在冲击器和记录系统之间设置了无线触发系统。为此，我们研制了一台便携式示波器，用于现场监测地震波，通过本课题的研究，初步建立了“地震挖沟”系统。

The purpose of this research is to establish the system of "seismic trenching by shallow hi-resolution seismic reflection method". The system is composed of the Yuatsu Impactor (Seimic source) and the iXL (Data processing). The former was made by the cooperative work of Chiba University, GSI,and Mitsubishi Juko in 1993 before the begining of this research project. The latter was prepared by this grant. The following points are essential for the improvement of the system.1.In order to save time in surveying shot and receiving points, we combine bothe Total Station and DGPS systems. Thus, we can get the results of surveying immediately and put them into the iXL smoothly.2.Seismic trenching requires dense distribution of both shot and receiving points. This inevitably brings tangle of lines and cables. Thus we abolish a trigger cable from the impactor and set the wireless trigger system between the impactor and a recording system.3.Seismic trenching often requires 3-component geophones. For this case, we prepare a portable oscilloscope for monitoring seismic wave in field.We confirm the system of "seismic trenching" has been basically established through this research project.