A new magnetotelluric inversion scheme using generalized RRI method

Yamane, Kazunobu; Takasugi, Shinji; Lee, Ki Ha

doi:10.1016/0926-9851(96)00023-7

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…The 2-D MT inversion algorithm, GRRI (Lee et al, 1995;Yamane et al, 1996), was applied to this data as in the previous analysis. The algorithm is an extension of the RRI algorithm, developed by Smith and Booker (1991).…”

Section: -D Modelingmentioning

confidence: 99%

2-D georesistivity structure in the central part of the northeastern Japan arc

Fujinawa

Kawakami²,

Inoue³

et al. 2014

Earth Planet Sp

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Wide-band (0.002∼20,000 Hz) magnetotelluric measurements (MT) observations have been conducted along three traverses in the central Tohoku district of the northeastern Japan arc at 86 observation sites since 1990 in order to image the electrical resistivity structure. We used the impedance tensors fully corrected for the three-dimensional galvanic distortion effects including static shift effects in order to refine previous 2-D models (discussed in Fujinawa et al., 1997). The subsurface 3-D effects are found to be generally small with the result of a slight difference between the present model and the previously reported one.The modeling results indicate that the crust is homogeneous without an enhanced conductivity zone in the lower crust, in general agreement with results in the northern part of the Tohoku district. The refined resistivity profiles delineate more clearly two near-surface conductive anomalies located in the fracture zone between the Dewa Hill and the Central Basin Range, and in the zone between the Kitakami and Abukuma River regions. Conductors in the crust west of the Sekiryo Mountain Range generally correlate well with mapped faults or pre-Tertiary tectonic lines. Several buried faults are also suggested from the conductivity data. The electrical resistivity distribution and known active faults are integrated to better understand the seismo-tectonics and geologic regime associated with the subduction processes in the Japan arc region.

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Section: -D Modelingmentioning

confidence: 99%

2-D georesistivity structure in the central part of the northeastern Japan arc

Fujinawa

Kawakami²,

Inoue³

et al. 2014

Earth Planet Sp

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“…Many geophysical investigations have suffered the lack of resolution with depth for MT inversion [23,28,8,17]. Our method also has difficulties to improve the depth resolution.…”

Section: Numerical Experimentsmentioning

confidence: 94%

Magnetotelluric inversion via reverse time migration algorithm of seismic data

Shin

2007

Journal of Computational Physics

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“…So, for simplicity, we assumed that the regional strike in the 2-D modeling is N-S. The 2-D MT inversion algorithm, GRRI (Lee et al, 1995;Yamane et al, 1996) was used, extending to the RRI algorithm developed by Smith and Booker (1991). Effects of the Pacific Ocean and the Japan Sea are considered by assuming a 50 m thick surface layer with a resistivity of 0.2 ·m −1 (salt water), extending out from the coast.…”

Section: Datamentioning

confidence: 99%

Conductivity distribution and seismicity in the northeastern Japan Arc

Fujinawa

Kawakami²,

Inoue³

et al. 2014

Earth Planet Sp

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Wideband magnetotelluric (MT) observation data were obtained from 91 sites along six transects in the central part of the Japan Arc. Here, a quasi-3D georesistivity distribution, in addition to other geophysical and geological parameters, is used to better understand seismicity in the region. We found that high seismicity in the Central Mountain Range is due to relatively poor fluid saturation caused by volcanism. The high conductive fracture zone in the west of the Central Basin without big earthquakes is characterized by a low Poisson ratio. It is suggested that strains cannot be accumulated in those regions. The Miyagi-ken-hokubu region with a frequent occurrence of large earthquakes, is conductive-high Poisson ratio-high V p suggesting that the zone is relatively fluid-rich and brittle.

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A new magnetotelluric inversion scheme using generalized RRI method

Cited by 8 publications

References 2 publications

2-D georesistivity structure in the central part of the northeastern Japan arc

2-D georesistivity structure in the central part of the northeastern Japan arc

Magnetotelluric inversion via reverse time migration algorithm of seismic data

Conductivity distribution and seismicity in the northeastern Japan Arc

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