近年來，由於新竹地區的蓬勃發展，市區不斷地擴張，加上科學園區的設立，使的新竹地區成為重要的科技重鎮。由於新城斷層通過新竹科學園區，如果發生地震將會造成廠房與公共設施的損壞，所以新城斷層的位置是我們所關心的。本文主要是利用人控音頻大地電磁法的結果研究新城斷層。 EH-4是新發展中之儀器，是一種利用人控音頻大地電磁法理論所發展的新設備，其最大測勘深度約可達到1km深。本研究主要是利用EH-4去測量新竹至頭份地區之電場與磁場強度，依據CSAMT所測的視電阻率、相位與相關係數之資料可以解釋當地之地層結構，因此可以得到新城斷層之位置。除此之外，CSAMT的剖面將與地電阻影像剖面法之剖面作比較，我們就可了解CSAMT之優缺點。 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.
