Magnetotelluric survey of an active fault system in the northern part of kinki district, southwest japan

Mogi, Tohru; Katsura, Ikuo; Nishimura, Susumu

doi:10.1016/0191-8141(91)90070-y

Cited by 12 publications

(7 citation statements)

References 9 publications

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“…A FZC is imaged at all segments and hydrogeologic interpretations of the FZCs are favored (see figure caption for references). These studies in conjunction with the results from the West fault segments support the assumption that the properties of FZCs are linked to the state of activity of a fault [e.g., Mogi et al, 1991;Bedrosian et al, 2002]. The greater the activity of a fault segment, the more pronounced the conductivity increase of the FZC Figure 13.…”

Section: Comparison Of Upper Crustal Fault Zone Studiessupporting

confidence: 68%

Correlation of electrical conductivity and structural damage at a major strike‐slip fault in northern Chile

2004

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[1] Large-scale strike-slip fault zones are often imaged as electrically conductive structures in the brittle crust. However, the relationship of conductivity and internal architecture of the fault zone remains largely unclear. This paper presents results of a study designed to compare the record of structural deformation across a fault zone with its electrical conductivity image. Two high-resolution magnetotelluric profiles trend perpendicularly across the West fault, a branch of the Precordilleran fault system in northern Chile. The magnetotelluric and geomagnetic response functions in the frequency range from 1000 Hz to 0.1 Hz clearly image a fault zone conductor (FZC) about 350 m wide and 1500 m deep, trending along the surface trace of the fault. The position of the FZC and its geometric properties (width, dip) correlate with a region of intense fluid alteration and the orientation of fault-related damage elements (minor faults, fractures). According to estimates of fluid salinity and rock porosity, the conductivity anomaly results from meteoric water penetrating into a permeable zone. This suggests that the increase in electrical conductivity is causally related to a mesh of minor faults and fractures, acting as a pathway for fluids. The FZC reflects the central and most fractured part of the damage zone. In view of similar published magnetotelluric studies, we infer a dependency of a fault's state of activity and the characteristics of the FZC such as its conductance, width, and depth extent. Ongoing deformation is the controlling factor for maintaining a permeable and electrically conductive fracture network.

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Section: Comparison Of Upper Crustal Fault Zone Studiessupporting

confidence: 68%

Correlation of electrical conductivity and structural damage at a major strike‐slip fault in northern Chile

2004

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“…Approximate extent of mesoscopic, microscopic, and geochemical fault zone-related deformation and alteration over approximately 100 m. Data are combined from this paper and Schulz and Evans (1998). The lower graph shows the approximate extent of fault zone-related deformation and geophysical imaging of fault zones over approximately 1000 m. Seismic re¯ec-tion and MT data for various strike-slip faults (Feng and McEvilly, 1983;Mogi et al, 1991;Eberhart-Phillips et al, 1995;Unsworth et al, 1997;Stern and McBride, 1998). Mesoscopic and microscopic deformation widths taken from Chester et al (1993), this paper, and Schulz and Evans (1998).…”

Section: Guided Wavesmentioning

confidence: 99%

“…9). Seismic re¯ection studies (Feng and McEvilly, 1983;Stern and McBride, 1998), velocity models (McCaree-Pellerin and Christensen, 1998), magnetotelluric studies, (Mogi et al, 1991;Unsworth et al, 1997), and tomographic studies (Michelini and McEvilly, 1991;Eberhart-Phillips and Michael, 1993;Scott et al, 1994) suggest that some major strike-slip faults consist of a low-velocity zone (LVZ) as thick as 2±3 km. Fault-guided waves have been used to infer fault zone widths of H100±200 m for the SAF (Li and Leary, 1990;Ben-Zion and Malin, 1991;Li et al, 1994aLi et al, ,b, 1997aBen-Zion, 1998) and the San Jacinto Fault (Li et al, 1997b), a width of H30±60 m for the Nojima Fault (Li et al, 1998) and smaller faults (Hough et al, 1994;Lou et al, 1997).…”

Section: Seismological/geophysical Implicationsmentioning

confidence: 99%

Mesoscopic structure of the Punchbowl Fault, Southern California and the geologic and geophysical structure of active strike-slip faults

Schulz

Evans

2000

Journal of Structural Geology

137

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“…Small earthquakes suggest continuing blocks' movement (Mogi at al., 1991). In the area under the study, locations of such earthquakes are concentrated in the Shomeron Triangle.…”

Section: Vertical Vs Lateral Motionsmentioning

confidence: 99%

The morphotectonic structure of the lower Jordan Valley – an active segment of the Dead Sea Rift

Belitzky¹

2002

Stephan Mueller Spec. Publ. Ser.

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Abstract. The pioneering morphotectonic study of young structures and movements in the central segment of the Dead Sea Rift, along the lower Jordan Valley, included analysis of the relief, drainage network, and remote sensing images. The Dead Sea Rift is the major transform along which the Arabian plate has moved sinistrally with respect to the African plate about 100 km from the Neogene to the Recent. The lower Jordan Valley surface is covered by the late Pleistocene Lisan lacustrine Formation and by the Holocene clastic deposits. The transform in the lower Jordan Valley is composed of three major segments: northern Kinnarot, southern Jericho, and the connecting them Malih. The Kinnarot and the Jericho segments were formed under transtension and both trend N-S; in them elongated pull-apart basins have developed. In these basins clastics and evaporites were accumulating since the Late Miocene. The NNE-trending Malih segment was formed under transpression that formed the Malih uplift. Uplifted and subsided areas identified along the lower Jordan Valley indicate vertical rather than lateral motions: almost no evidence of lateral displacement was found there. Dominance of vertical motions suggests that the neotectonic regime was governed by continuous N-S extension of the Israel-Sinai plate and by transverse movements during the Arabian plate "escape". Locations of earthquakes are concentrated in the Shomeron Triangle. This can be explained by rejuvenation of the Triangle faults induced by ongoing N-S extension of the Sinai sub-plate. N-S extension on the west results in decrease of the rate of the lateral motion along the transform in the lower Jordan Valley.

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Magnetotelluric survey of an active fault system in the northern part of kinki district, southwest japan

Cited by 12 publications

References 9 publications

Correlation of electrical conductivity and structural damage at a major strike‐slip fault in northern Chile

Correlation of electrical conductivity and structural damage at a major strike‐slip fault in northern Chile

Mesoscopic structure of the Punchbowl Fault, Southern California and the geologic and geophysical structure of active strike-slip faults

The morphotectonic structure of the lower Jordan Valley – an active segment of the Dead Sea Rift

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Magnetotelluric survey of an active fault system in the northern part of kinki district, southwest japan

Cited by 12 publications

References 9 publications

Correlation of electrical conductivity and structural damage at a major strike‐slip fault in northern Chile

Correlation of electrical conductivity and structural damage at a major strike‐slip fault in northern Chile

Mesoscopic structure of the Punchbowl Fault, Southern California and the geologic and geophysical structure of active strike-slip faults

The morphotectonic structure of the lower Jordan Valley &#8211; an active segment of the Dead Sea Rift

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The morphotectonic structure of the lower Jordan Valley – an active segment of the Dead Sea Rift