The plate coupling in the Tokai District,the Central Japan,inferred from the different data using triangular dislocation elements |
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| Authors: | Tadafumi Ochi Teruyuki Kato |
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| Institution: | 1. School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada;2. Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, the Netherlands;3. Department of Geological Sciences, University of Florida, Gainesville, FL 32608, USA;4. Department of Geophysics, University of Bucharest, 6 Traian Vuia Street, RO-020956, Bucharest, Romania;5. Pacific Geoscience Centre, Geological Survey of Canada, 9860 West Saanich Road, Sidney, British Columbia, Canada;6. School of Earth Sciences, Ohio State University, 125 South Oval Mall, Columbus, OH 43210, USA;7. University of Beira Interior, Instituto D. Luiz, Rua Marquês d''Ávila e Bolama, 6201-001 Covilhã, Portugal;1. Department of Earth Sciences–Geophysics, Uppsala University, Villavägen 16, SE‐752 36 Uppsala, Sweden;2. Department of Earth Sciences, University of Gothenburg, PO Box 460, SE-405 30 Göteborg, Sweden;3. Museum of Evolution, Uppsala University, Norbyvägen 16, SE‐752 36 Uppsala, Sweden;4. GeoZentrum Nordbayern, Universität Erlangen, Schloßgarten 5, D-91054 Erlangen, Germany;5. Tromsø University Museum, Natural Sciences, N-9037 Tromsø, Norway;6. Sedimentology and Environmental Geology, Geoscience Centre, University of Göttingen, Goldschmidtstrasse 3, D-37077 Göttingen, Germany;1. Escuela de Procesos y Energía, Universidad Nacional de Colombia, Medellín, Colombia;2. Corporación Geológica Ares, Bogotá, Colombia;3. Geociencias, Universidad de los Andes, Bogotá, Colombia;4. Smithsonian Tropical Research Institute, Balboa, Panamá;5. Vicepresidencia de Exploración, Empresa Colombiana de Petroleos (ECOPETROL), Bogotá, Colombia;6. School of Earth and Environmental Sciences, Washington State University, Pullman, WA, USA;7. Instituto Colombiano del Petróleo (ICP-ECOPETROL), Piedecuesta, Colombia;1. Institute of the Physics of Earth, Russian Academy of Sciences (RAS), Moscow, Russia;2. Institute of Oil Geology & Geophysics, Siberian Div., RAS, Novosibirsk, Russia;3. “Bishkek” Research Station under RAS, Bishkek, Kyrgyzstan |
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| Abstract: | We estimate interseismic coupling on the subducting plate interface in the Tokai area, central Japan, by inverting two geodetic data sets. The data record surface motion between March 1996 to May 2000; one represents vertical motion deduced from the leveling observations and the other is the horizontal velocity field deduced from GPS observations. In the inversion, we employed the analytical solutions of surface displacement due to a triangular dislocation element embedded in a homogeneous elastic half space in order to represent the curved plate interface. The vertical data show that the most strongly coupled portion of the subduction interface is concentrated beneath Omaezaki Cape, while the horizontal data show strongest coupling in the shallower region of the subducting plate interface. The estimated maximum value of coupling from the horizontal data is 40 mm/year, while that from vertical data is 25 mm/year. |
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