天水地电阻率地表与井下多种观测方式的试验分析

Test Analysis on Geoelectrical Resistivity Observation Combining the Surface and Deep-well Methods at Tianshui Seismic Station in Gansu Province

2011年初天水地震台建成井下地电阻率观测专项项目,将地电水平观测推向了立体观测,其观测方式包括地表水平观测井下百米水平观测、地表与井下互换观测等。通过近两年的持续观测,地表A、B供电井下M、N观测以及井下水平观测两种方法获得的数据相对稳定、可靠;同时地表A、B供电井下M、N观测有助于数据变化的可靠性分析。在电磁环境较复杂的观测场地,地表A、B供电井下M、N观测和井下水平观测可能是地电阻率观测较为有效的两种方法。

In early 2011,Tianshui seismic station of Gansu province developed a special project for observation on deep-well geoelectrical resistivity,which pushed the horizontal geoelectrical observation to stereo observation.The methods include surface horizontal observation,deep-well horizontal observation,and the electrode interchange-able test between surface and deep-well observation.Through continuous observation in past two years,data obtained by two methods which are deep-well M、N observation supplied power by surface A、B and deep-well horizontal observation is relatively stable and reliable.Meanwhile,deep-well M 、N observation supplied power by surface A、B could contribute to reliability analysis on data changes.At observation sites where electromagnetic environment is more complex,deep-well M、N observation supplied power by surface A、B and deep-well horizontal observation may be two effective methods.