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| | Abstract | | As the mud volcanism is thought to cause natural disasters, it is important to evaluate the activity of mud volcanoes in order to select the site of underground facilities such as the high level radioactive waste for geologic disposal. Active inland mud volcanoes are distributed along the axis of anticlines and faults in the Neogene sedimentary rock area in the southwestern Taiwan. We conducted the CSAMT survey around the Wushanding mud volcano in order to clarify the geological structure and flow path of fluid from deep underground based on the analyzed 2D resistivity sections. As a result, the extremely low resistivity zones (ELR) were detected along the Chishan fault at the depth of 100 - 500m. Furthermore, one of the ELR was distributed under the Wushanding mud volcano at the depth of 300 - 500m with a 300m diameter. We concluded that some of the deep fluid ascend along the Chishan fault and erupt at the fault, and that others migrate to the anticline axis, being trapped once under the impermeable cap rocks as a mud chamber, and ascend again to the ground surface. |
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