Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6)
Abstract The Hidaka collision zone, the collision boundary between the NE Japan and Kurile arcs, is known to be an ideal region to study the evolution of island arcs. The hypocenter of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) in the western part of the Hidaka collision zone was unusually...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-09-01
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| Series: | Earth, Planets and Space |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s40623-019-1078-7 |
| _version_ | 1818863897048776704 |
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| author | Hiroshi Ichihara Toru Mogi Hideyuki Satoh Yusuke Yamaya |
| author_facet | Hiroshi Ichihara Toru Mogi Hideyuki Satoh Yusuke Yamaya |
| author_sort | Hiroshi Ichihara |
| collection | DOAJ |
| description | Abstract The Hidaka collision zone, the collision boundary between the NE Japan and Kurile arcs, is known to be an ideal region to study the evolution of island arcs. The hypocenter of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) in the western part of the Hidaka collision zone was unusually deep for an inland earthquake, and the reverse fault that caused the earthquake has an uncharacteristically steep dip. In this study, we used three-dimensional inversion to reanalyze broadband magnetotelluric data acquired in the collision zone. The inverted resistivity model showed a significant area of high resistivity around the center of the collision boundary. We also identified a conductive zone beneath an area of serpentinite mélange in a zone of high P–T metamorphic rocks west of the high-resistivity zone. The conductive zone possibly reflects areas rich in pore fluids related to the formation and elevation of the serpentinites. Sensitivity tests indicated the need for additional magnetotelluric survey data to delineate the resistivity distribution around the epicentral area of the 2018 earthquake although the resistivity model showed a conductive zone in this area. |
| first_indexed | 2024-12-19T10:23:03Z |
| format | Article |
| id | doaj.art-b6b44fa912f046d6b0d4e4c03e1c2837 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-19T10:23:03Z |
| publishDate | 2019-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-b6b44fa912f046d6b0d4e4c03e1c28372022-12-21T20:25:59ZengSpringerOpenEarth, Planets and Space1880-59812019-09-0171111010.1186/s40623-019-1078-7Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6)Hiroshi Ichihara0Toru Mogi1Hideyuki Satoh2Yusuke Yamaya3Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya UniversityEarthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya UniversityNuclear Regulation Department, Secretariat of Nuclear Regulation AuthorityRenewable Energy Research Center, Fukushima Renewable Energy Institute, AISTAbstract The Hidaka collision zone, the collision boundary between the NE Japan and Kurile arcs, is known to be an ideal region to study the evolution of island arcs. The hypocenter of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) in the western part of the Hidaka collision zone was unusually deep for an inland earthquake, and the reverse fault that caused the earthquake has an uncharacteristically steep dip. In this study, we used three-dimensional inversion to reanalyze broadband magnetotelluric data acquired in the collision zone. The inverted resistivity model showed a significant area of high resistivity around the center of the collision boundary. We also identified a conductive zone beneath an area of serpentinite mélange in a zone of high P–T metamorphic rocks west of the high-resistivity zone. The conductive zone possibly reflects areas rich in pore fluids related to the formation and elevation of the serpentinites. Sensitivity tests indicated the need for additional magnetotelluric survey data to delineate the resistivity distribution around the epicentral area of the 2018 earthquake although the resistivity model showed a conductive zone in this area.http://link.springer.com/article/10.1186/s40623-019-1078-7Hidaka collision zoneMagnetotelluricsElectrical conductivityResistivitySerpentinite2018 Hokkaido Eastern Iburi earthquake |
| spellingShingle | Hiroshi Ichihara Toru Mogi Hideyuki Satoh Yusuke Yamaya Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) Earth, Planets and Space Hidaka collision zone Magnetotellurics Electrical conductivity Resistivity Serpentinite 2018 Hokkaido Eastern Iburi earthquake |
| title | Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) |
| title_full | Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) |
| title_fullStr | Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) |
| title_full_unstemmed | Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) |
| title_short | Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M w 6.6) |
| title_sort | electrical resistivity modeling around the hidaka collision zone northern japan regional structural background of the 2018 hokkaido eastern iburi earthquake m w 6 6 |
| topic | Hidaka collision zone Magnetotellurics Electrical conductivity Resistivity Serpentinite 2018 Hokkaido Eastern Iburi earthquake |
| url | http://link.springer.com/article/10.1186/s40623-019-1078-7 |
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