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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS008 Poster presentation 2019 Crustal heterogeneity on electrical resistivity around the Niigata-Kobe Tectonic Zone, Chubu Region, Japan Dr. Ryokei Yoshimura Disaster Prevention Research Institute Kyoto University IAGA Hiroaki Toh, Makoto Uyeshima, Naoto Oshiman, Research Group For Crustal Resistivity Structure Wideband magnetotelluric (MT) soundings were carried out around the concentrated deformation zone, Chubu region, Japan (NKTZ: Niigata-Kobe Tectonic Zone pointed out by Sagiya et al.[2000]). The NKTZ becomes one of important target areas in "the 2nd new Program of and Observation for Earthquake Prediction" (Hirata, 2004). A multidisciplinary research around the NKTZ, especially the Atotsugawa fault, using dense GPS, seismological observations and investigation of crustal resistivity structure has been started since 2004. In October 2004, we obtained the electric and magnetic fields data at 30 sites across the central part of the NKTZ in which the Ushikubi, Mozumi-Sukenobu, Atotsugawa, Takayama- Oppara faults are located. Observed data at all sites were processed by the remote reference technique. Using Phase Tensor analysis (Caldwell et al., 2004), we verified the data showed strong twodimensionality in the long period (1-1000sec). Apparent resistivity and phase in TM mode, phase in TE mode and tipper were used for two-dimensional inversions. Obtained model shows inhomogeneity in the middle and lower crust. Additionally in 2005, to reveal heterogeneity along the fault plane, we carried out MT survey along the Atotsugawa fault. A seismic gap and a creep-like crustal movement were observed along the Atotsugawa fault. Obtained preliminary inversion result shows lateral inhomogeneity correlated with heterogeneity in seismicity along the fault, which suggested that the seismic gap on the Atotsugawa fault plane seems to be modeled as a high resistive block. We will report outline of the both MT surveys and also discuss results compared with seismic and GPS data. Keywords: magnetotellurics, atotsugawa fault, tectonic zone
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS008 Poster presentation 2020 Deep electrical imaging of Parbati Beas Valley geothermal region of NW Himalayan region Dr. Veeraswamy Koppireddi Magnetotellurics N.G.R.I. IASPEI K.Ravi Shyankar, G.Dhanunjaya Naidu, Sarana Basava, K.K.Abdul Azeez Parbati Beas valley of NW Himalaya forms one of the important geothermal regions. The well known structural features such as MCT and MBT forms part of the region. The important hot spring locations such as Manikaran, Vashisht etc can also be seen. After successful delineation of a large anomalous conductive zone near Puga region related to major geothermal reservoir, much attention is being paid to this region to explore the area for possible exploitation of resources. Two long profiles oriented one nearly in NS direction and the other in NE-SW direction with 30 broadband stations have been completed to map the deep geoelectrical structure with a station interval of about 5 km. Single site robust processing of the data gave consistent MT response functions after removal of local distortion effects using decomposition technique. The data are modeled with both TE and TM mode response functions using non-linear conjugate gradient algorithm. Anomalous shallow conductive features derived from the data are indicative of the possible presence of geothermal reservoir and deeper anomalous features are interpreted due to the presence of major tectonic features in the region. Keywords: beas parbati valley, himalayas, geothermal region
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy<br />
(S) - <strong>IASPEI</strong> - International Association of Seismology and Physics of the Earth's<br />
Interior<br />
JSS008 Poster presentation 2019<br />
Crustal heterogeneity on electrical resistivity around the Niigata-Kobe<br />
Tectonic Zone, Chubu Region, Japan<br />
Dr. Ryokei Yoshimura<br />
Disaster Prevention Research Institute Kyoto University IAGA<br />
Hiroaki Toh, Makoto Uyeshima, Naoto Oshiman, Research Group For Crustal<br />
Resistivity Structure<br />
Wideband magnetotelluric (MT) soundings were carried out around the concentrated deformation zone,<br />
Chubu region, Japan (NKTZ: Niigata-Kobe Tectonic Zone pointed out by Sagiya et al.[2000]). The NKTZ<br />
becomes one of important target areas in "the 2nd new Program of and Observation for Earthquake<br />
Prediction" (Hirata, 2004). A multidisciplinary research around the NKTZ, especially the Atotsugawa<br />
fault, using dense GPS, seismological observations and investigation of crustal resistivity structure has<br />
been started since 2004. In October 2004, we obtained the electric and magnetic fields data at 30 sites<br />
across the central part of the NKTZ in which the Ushikubi, Mozumi-Sukenobu, Atotsugawa, Takayama-<br />
Oppara faults are located. Observed data at all sites were processed by the remote reference technique.<br />
Using Phase Tensor analysis (Caldwell et al., 2004), we verified the data showed strong twodimensionality<br />
in the long period (1-1000sec). Apparent resistivity and phase in TM mode, phase in TE<br />
mode and tipper were used for two-dimensional inversions. Obtained model shows inhomogeneity in<br />
the middle and lower crust. Additionally in 2005, to reveal heterogeneity along the fault plane, we<br />
carried out MT survey along the Atotsugawa fault. A seismic gap and a creep-like crustal movement<br />
were observed along the Atotsugawa fault. Obtained preliminary inversion result shows lateral<br />
inhomogeneity correlated with heterogeneity in seismicity along the fault, which suggested that the<br />
seismic gap on the Atotsugawa fault plane seems to be modeled as a high resistive block. We will report<br />
outline of the both MT surveys and also discuss results compared with seismic and GPS data.<br />
Keywords: magnetotellurics, atotsugawa fault, tectonic zone
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