In 1981 and 1982 intensive observations of the geomagnetic field were carried out in a possible seismic gap region in the western part of the North Anatolian Fault Zone to trace on active fault and also to accumulate geomagnetic data for earthquake prediction research. The data of magnetic anomalies obtained from profile measurements across the fault were interpreted to reveal an anomalous magnetic structure associated with the active fault. In order to confirm our results thus derived in the Iznik-Mekece area, similar observations were also made at IsmetpaSa where fault traces are well known as well as creep for the North Anatolian Fault Zone.It is concluded that highly magnetized dike-like bodies exist extensively along active fault lines in the North Anatolian Fault Zone. This characteristic feature can be utilized for studies of active fault location and also for tectonomagnetic studies.
Observations of the geomagnetic total intensity, electric self-potential and surface resistivity were carried out at the Atotsugawa fault, a 60 km long active fault of strike-slip type located in central Japan, in order to investigate the active fault structure and fault activity from electric and magnetic aspects. Notable anomalies were found along a measurement line selected in the central segment of the Atotsugawa fault. The anomalies are summarized as follows. The surface resistivity, as derived from VLF-MT, of the zone bounded on the north by one fault line and on the south by another is lower than that outside the zone. A very local anomaly in self-potential exists at the northern fault line which constitutes the northern boundary of the low resistivity zone. Inside this low resistivity zone exists a somewhat more resistive body. It should be highly magnetized as deduced from a magnetic anomaly amounting to about 600 nT which was observed over the resistive body . The low resistivity zone seems to correspond to the fractured zone bounded by the two fault lines, and the northern one would be more active as implied by the self-potential anomaly which can be interpreted in terms of the electrokinetic effect associated with groundwater flow along the fault plane.
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