| Summary: | 碩士 === 國立中央大學 === 應用地質研究所 === 89 === In the past years, Hsinchu city and its surroundings have been developed rapidly, especially in the Hsinchu Science-Based Park (HSBP), which is one of the most important high technological sites in Taiwan. Since Hsinchen active fault passes through HSBP site, an earthquake may destroy the whole plants and public facilities in HSBP. Therefore, it is necessary to delineate the faults nearby. This paper presents the controlled-source audio frequency magnetotelluric (CSAMT) results and impacts of these results on fault investigations.
EH-4 is a newly developed instrument for CSAMT survey. The maximum depth of investigate of the EH-4 is about 1 km. In this study we use EH-4 to measure the responses of the electric field intensity and magnetic field intensity of the ground layers from the Hsinchu to Taofun. Based on the measured apparent resistivity, phase and coherency of CSAMT data, the subsurface layer structure can be delineated. Then, the Hsincheng fault line can be traced. In addition, compared the CSAMT resistivity sections to the RIP sections obtained in the same survey lines is done. The advantage and disadvantage of CSAMT method can be figured out.
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