秋田県千屋断層の電磁気構造

概要

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The understanding of the structue near the fault area provides us the information ofthe fracture zone and the way of prevention of the earthquake disaster. In order to knowthe distribution and the depth of active faults we have to investigate the resistivity in the deeper part of the fault. We selected Senya fault, one of the faults caused by Rikuu earthquake in 1896, as a survey area. The maximum vertical displacement is about 3 meters. Magnetic total force, apparent resistivity and phase have been obtained by using proton magnetometer, PL-MT and VLF-MT instruments. MT method showed anomlously low resistivity values around this fault. The intensity of the Earth's magnetic field shows the tendency of high anomaly in the western part of it. We can reveal the position anddistribution of fractured area and its resistivity structure along the Senya fault.
秋田大学鉱山学部附属資源地学研究施設の論文