Magnetic anomalies and low ground resistivity as possible indicators of active fault location: Preliminary results of electric and magnetic observations from the western part of the North Anatolian Fault Zone.

Honkura, Yoshimori; Işıkara, A. M.; Kolçak, D.; Orbay, Naci; Sipahioğlu, S.; Ohshiman, N.; Tanaka, Haruo

doi:10.5636/jgg.37.169

Cited by 22 publications

(13 citation statements)

References 8 publications

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“…These strikes coincide very well with four positive peaks of total intensity as is clearly seen in Fig. 15 [and also with four zones of low resistivity, see HONKURA et al (1985)]. …”

Section: Analysis For Ismetpaa Nosupporting

confidence: 54%

“…Since the detailed maps of our observation sites are given by HONKURA et al (1985), we will not enter into further details here.…”

Section: Some Characteristics Of the Observation Sitesmentioning

confidence: 99%

“…Since one of the effective means of earthquake prediction is to carry out * Now at Department of Earth Sciences , College of Humanities and Sciences, Nihon University, Tokyo, Japan, magnetic research to detect possible local changes in the geomagnetic field relating to tectonic activities within the crust, we initiated magnetic observations to study an anomalous magnetic structure along the fault and to select sites for repeated and continuous magnetic measurements at the possible seismic gap region in the western part of the North Anatolian Fault Zone (Here, it is necessary to mention that we also made resistivity measurements as described in our previous paper (HONKURA et al, 1985); the details will also be presented by HONKURA et al (in preparation)). In 1981 and 1982, magnetic measurements were made at some profiles perpendicular to the active fault line in the Iznik-Mekece region, and in order to confirm the results of our observations here, we also selected the Ismetpasa area, where fault traces are well established, for magnetic measurements.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic anomalies in the western part of the North Anatolian Fault Zone and their implications for active fault structure.

Işıkara

Honkura

Watanabe

et al. 1985

J. geomagn. geoelec

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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.

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“…These strikes coincide very well with four positive peaks of total intensity as is clearly seen in Fig. 15 [and also with four zones of low resistivity, see HONKURA et al (1985)]. …”

Section: Analysis For Ismetpaa Nosupporting

confidence: 54%

“…Since the detailed maps of our observation sites are given by HONKURA et al (1985), we will not enter into further details here.…”

Section: Some Characteristics Of the Observation Sitesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic anomalies in the western part of the North Anatolian Fault Zone and their implications for active fault structure.

Işıkara

Honkura

Watanabe

et al. 1985

J. geomagn. geoelec

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“…Geoelectric methods can provide a vital, non-destructive alternative, either as complementary or stand-alone methods. Good examples can be seen in Verma (1979), Honkura et al (1985), Uri Basson et.al. (1994), Cai et al (1996), Yang and Hung (1996), Unsworth et al (1999) and Yang et al (2002).…”

Section: Introductionmentioning

confidence: 97%

Verification of the Suspected Ta-chia-tung Fault by Ground Penetrating Radar and Resistivity Image Profiling Methods

Yang¹,

Yu²,

Guo³

et al. 2005

Terr. Atmos. Ocean. Sci.

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Ground penetration radar imaging reveals a prominent reflector which is offset vertically by about 2.6 m at depth about 2.3 m across the scarp. Schlumberger depth sounding exhibits a disrupted marker that links the loci of maximum apparent resistivity at greater depths.Resistivity image profiling (RIP) surveys across the scarp yield either zones of low resistivity (two profiles) or disruption of high resistivity zones (one profile); those anomalies are suggestive of a low angle thrust fault.

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“…Meanwhile, HONKURA et al (1985) reported on the results of electric and magnetic observations in the western part of the North Anatolian Fault Zone in 144N.…”

Section: Introductionmentioning

confidence: 99%

Electric and magnetic anomalies at the Atotsugawa fault and their implications for fault activity.

Ohshiman

Honkura²,

Kuge³

et al. 1987

J. geomagn. geoelec

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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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Magnetic anomalies and low ground resistivity as possible indicators of active fault location: Preliminary results of electric and magnetic observations from the western part of the North Anatolian Fault Zone.

Cited by 22 publications

References 8 publications

Magnetic anomalies in the western part of the North Anatolian Fault Zone and their implications for active fault structure.

Magnetic anomalies in the western part of the North Anatolian Fault Zone and their implications for active fault structure.

Verification of the Suspected Ta-chia-tung Fault by Ground Penetrating Radar and Resistivity Image Profiling Methods

Electric and magnetic anomalies at the Atotsugawa fault and their implications for fault activity.

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