An electrical resistivity survey was carried out using the pole–pole configuration around the Sayanokami spring area in the northern part of Ito Campus (Kyushu University, Fukuoka, Japan) to study the groundwater aquifer and its electrical characteristics. A Code Division Multiple Transmission (CDMT) system was used. The CDMT system transmits 24 currents simultaneously and measures 24 potential responses with monitoring of actual current waveforms. The system can inject current from multiple electrodes into the underground environment simultaneously using different individual current waveforms. The two-dimensional (2-D) inversion results of the electrical resistivity data indicate three layers from top to bottom, as follows: (a) a thin layer with a thickness of 3 m and a low resistivity (< 50 Ω m) representing topsoil; (b) a groundwater aquifer layer with an average resistivity between 50 and 170 Ω m and with a thickness ranging from 7 to 10 m, and (c) a highly resistive bedrock layer with resistivities higher than 200 Ω m and occupying depths from 15 m to the base of the model.

中文翻译：

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九州大学伊藤校区（日本福冈）使用电阻率法检测地下水含水层

使用伊藤校区北部（日本九州大学，日本福冈市）Sa矢上春季地区附近的极-极构造进行了电阻率调查，以研究地下水含水层及其电学特征。使用了码分多传输（CDMT）系统。CDMT系统同时传输24个电流，并通过监视实际电流波形来测量24个电位响应。该系统可以使用不同的单个电流波形同时从多个电极向地下环境注入电流。电阻率数据的二维（2-D）反演结果从上到下指示了三层，如下所示：（a）厚度为3 m且电阻率低（<50Ωm）的薄层表土;