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Izu detachment hypothesis: A proposal of a unified cause for the Miyake-Kozu event and the Tokai slow event
Earth, Planets and Space volume 57, pages925–934(2005)
Based on the fact that interseismic deformation of collision zones is generally described by slip along a detachment at depth, I attempt to interpret the deformation of the Izu collision zone in terms of a detachment model. The systematic deviation of the GPS velocities of the Izu Peninsula (Nov. 1998–June 2000) from the Philippine Sea-Eurasian relative plate motions is fitted by the slip on the detachment at a depth of 15–20 km with a rate of 3 cm/yr. On June 26, 2000, seismo-magmatic activity that started near Miyakejima expanded NW by 20 km close to Kozushima in association with dike intrusion over a few months. The horizontal movements associated with this event, however, spread over wide areas in central Honshu. Simple dike intrusion models cannot explain these movements. To explain these, I hypothesize that a 20 cm of rapid slip occurred on the detachment at the time of this event. The abnormal crustal movements in the Tokai-central Honshu-Kanto region then started after the event. I propose that they represent delayed diffusive transfer of the slip on the detachment over surrounding low viscosity layers, such as nearby rupture zones of great earthquakes.
Aoki, H., Configuration of the PHS plate beneath Tokai areas and a few characteristics of plate motion, Abstr. Seism. Soc. Jpn., C036, 2003 (in Japanese).
Asano, S., K. Wada, T. Yoshii, M. Hayakawa, Y. Misawa, T. Moriya, T. Kanazawa, H. Murakami, F. Suzuki, R. Kubota, and K. Suyehiro, Crustal structure in the Northern Part of the Philippine Sea Plate as derived from seismic observations of Hatoyama-Off Izu Peninsula explosions, J. Phys. Earth, 33, 173–189, 1985.
Bott, M. H. P. and D. S. Dean, Stress diffusion from plate boundaries, Nature, 243, 339–341, 1973.
Elsasser, W. M., Convection and stress propagation in the upper mantle, in The Application of Modern Physics to the Earth and Planetary Interiors, edited by S. K. Runcorn, pp. 223–246, John Wiley, New York, 1967.
Fujii, Y., Creep dislocation propagation along the East-off-Izu Tectonic Line, Japan, around the year of 1930 and 1976, Jisin, 30, 389–400, 1977 (in Japanese).
Fujii, Y. and K. Nakane, The 1930 Kita-Izu earthquake and related crustal movements in the northern part of the Izu Peninsula, Japan, during pre- and post-seismic period, J. Geod. Soc. Jpn., 24, 59–68, 1978 (in Japanese).
Fukuyama, E., A. Kubo, H. Kawai, and K. Nonomura, Seismic remote monitoring of stress field, Earth Planets Space, 53, 1021–1026, 2001.
Furuya, M., S. Okubo, R. Miyajima, I. Meilano, W. Sun, Y. Tanaka, and T. Miyazaki, Mass budget of the magma flow in the 2000 volcano-seismic activity at Izu-island, Japan, Earth Planets Space, 55, 375–385, 2003.
Geographical Survey Institute, Crustal movements in the Tokai district, Rep. Corrd. Comm. Earthquake Predict., 69, 303–393, 2003.
Hashimoto, M. and D. D. Jackson, Plate tectonics and crustal deformation around the Japanese Island, J. Geophys. Res., 98, 16149–16166, 1993.
Heki, K., G. R. Foulger, B. R. Julian, and C.-H. Jahn, Plate dynamics near divergent boundaries: Geophysical implications of postrifting crustal deformation in NE Iceland, J. Geophys. Res., 98, 14279–14297, 1993.
Ida, Y., Interpretation of seismic and volcanic activities in the Izu block in relation to collision tectonics, J. Phys. Earth, 39, 421–440, 1991.
Ishibashi, K., Specification of a soon-to-occur seismic faulting in the Tokai district, central Japan, based upon seismotectonics, Earthquake Prediction—An International Review, Maurice Ewing Series, 4, 297–332, 1981.
Ishibashi, K., Seismotectonic modeling of the repeating M 7-class disastrous Odawara earthquake in the Izu collision zone, central Japan, Earth Planets Space, 56, 843–858, 2004.
Ishibashi, K. and Y. Itani, Explanation of the westward motion of the Izu Peninsula by collision—An interpretation of GPS velocity vectors, Jisin, 56, 387–390, 2004 (in Japanese).
Ito, T. and S. Yoshioka, A dike intrusion model in and around Miyakejima, Niijima and Kozushima in 2000, Tectonophysics, 359, 171–187, 2002.
Kaidzu, M., T. Nishimura, M. Murakami, S. Ozawa, T. Sagiya, H. Yarai, and T. Imakiire, Detection and monitoring of ongoing aseismic slip in the Tokai region, central Japan, Earth Planets Space, 52, ix–xviii, 2000.
Kamiya, S. and Y. Kobayashi, Seismological evidence for the existence of serpentinized wedge mantle, Geophys. Res. Lett., 27, 819–822, 2000.
Kamiya, S. and Y. Kobayashi, Seismological evidence for the existence of serpentinized wedge mantle in the Tokai district, 2005 (in preparation).
Kasahara, K., J. Yamada, and M. Ando, Crustal movements in the southern Kanto district, and a related working hypothesis, Publications for the 50th Anniversary of the Great Kanto Earthquake, 1923, Earthquake Research Institute, University of Tokyo, 103–116, 1973 (in Japanese).
Koyama, M., Possibilities of simultaneous occurrence of volcanic eruptions and earthquakes in the northern margin of the Philippine Sea plate, Earth Monthly Suppl., 5, 137–144, 1992 (in Japanese).
Koyama, M. and S. Umino, Why does the Higashi-Izu monogenetic volcano group exist in the Izu Peninsula?: relationships between late Quaternary volcanism and tectonics in the northern tip of the Izu-Bonin arc, J. Phys. Earth, 39, 391–420, 1991.
Le Pichon, X. et al., The eastern and western ends of Nankai Troughs: results of Box 5 and Box 7 Kaiko survey, Earth Planet. Sci. Lett., 83, 199–213, 1987.
Lehner, F. K., V. C. Li, and J. R. Rice, Stress diffusion along rupturing plate boundaries, J. Geophys. Res., 86, 6155–6169, 1981.
Matsuda, T., Surface faults associated with Kita-Izu earthquake of 1930 in Izu Peninsula, Japan, in Izu Peninsula, edited by M. Hoshino and T. Aoki, pp. 73–93, Tokai Univ. Press, 1972 (in Japanese).
Matsumura, S., Focal zone of a future Tokai earthquake inferred from the seismicity pattern around the plate interface, Tectonophysics, 273, 271–291, 1997.
Mazzotti, S., P. Henry, and X. Le Pichon, Transient and permanent deformation of central Japan estimated by GPS 2. Strain partitioning and arc-arc collision, Earth Planet. Sci. Lett., 184, 445–469, 2001.
Miyabe, N., On the vertical earth movement in Kwanto districts, Bull. Earthq. Res. Inst., 9, 1–20, 1931.
Miyashita, K., J. Li, and K. Vijaykumar, Tectonic model, explaining the secular crustal deformation in the Kanto-Tokai region, Abstr. Seism. Soc. Jpn., C0034, 2003 (in Japanese).
Nakamura, K., K. Shimazaki, and N. Yonekura, Subduction, bending and eduction. Present and Quaternary tectonics of the northern border of the Philippine Sea plate, Bull. Soc. Geol. France, 26, 221–243, 1984.
Nishimura, T., S. Ozawa, M. Murakami, T. Sagiya, T. Tada, M. Kaidzu, and M. Ukawa, Crustal deformation caused by magma migration in the northern Izu Islands, Japan, Geophys. Res. Lett., 19, 3745–3748, 2001.
Noguchi, S., Geometry of the Philippine Sea slab and the convergent tectonics in the Tokai District, Japan, Jisin, 49, 295–325, 1996 (in Japanese).
Noguchi, S. and S. Sekiguchi, Subduction and deformation of the Philippine Sea and Pacific plates beneath the Kanto region, The Earth Monthly, 23, 733–741, 2001 (in Japanese).
Obara, K., Nonvolcanic deep tremor associated with subduction in southwest Japan, Science, 296, 1679–1681, 2002.
Okada Y., Surface deformation due to shear and tensile faults in a half-space, Bull. Seism. Soc. Am., 75, 1135–1154, 1985.
Ozawa, S., M. Murakami, M. Kaidzu, T. Tada, T. Sagiya, Y. Hatanaka, H. Yarai, and T. Nishimura, Detection and monitoring of ongoing aseismic slip in the Tokai region, central Japan, Science, 298, 1009–1021, 2002.
Raleigh, C. B. and M. S. Paterson, Experimental deformation of serpentinite and its tectonic implications, J. Geophys. Res., 70, 3965–3985, 1965.
Sagiya, T., Interplate coupling in the Tokai District, Central Japan, deduced from continuous GPS data, Geophys. Res. Lett., 26, 2315–2318, 1999.
Sakai, S., T. Yamada, S. Ide, M. Mochizuki, H. Shiobara, T. Urabe, N. Hirata, M. Shinohara, T. Kanazawa, A. Nishizawa, G. Fujie, and H. Mikada, Magma migration from the point of view of seismic activity in the volcanism of Miyake-jima island in 2000, J. Geogr., 110, 145–155, 2001 (in Japanese).
Savage, J. C., A dislocation model of strain accumulation and release at a subduction zone, J. Geophys. Res., 88, 4984–4996, 1983.
Seno, T., Fractal asperities, invasion of barriers, and interplate earthquakes, Earth Planets Space, 55, 649–665, 2003.
Seno, T., Collision vs. subduction: the importance of slab dehydration, in The Seismogenic Zone of Subduction Thrust Faults, edited by T. Dixon and J. C. Moore, Columbia Univ. Press, 2005 (in press).
Seno, T. and T. Yamasaki, Low-frequency tremors, intraslab and interplate earthquakes in Southwest Japan—from a viewpoint of slab dehydration, Geophys. Res. Lett., 30(22), doi:10.1029/2003GL018349, 2003.
Seno, T., S. Stein, and A. E. Gripp, A model for the motion of the Philippine Sea plate consistent with NUVEL-1 and geological data, J. Geophys. Res., 98, 17941–17948, 1993.
Seno, T., T. Sakurai, and S. Stein, Can the Okhotsk plate be discriminated from the North American plate?, J. Geophys. Res., 101, 11305–11315, 1996.
Shimazaki, K. and P. Somerville, Static and dynamic parameters of the Izu-Oshima, Japan Earthquake of January 14, 1978, Bull. Seism. Soc. Am., 69, 1343–1378, 1979.
Somerville, P., The accommodation of plate collision by deformation in the Izu block, Japan, Bull. Earthq. Res. Inst., 53, 629–648, 1978.
Sugimura, A., Plate boundaries around Japan, Kagaku, 42, 192–202, 1972 (in Japanese).
Taira, A., K. T. Pickering, B. F. Windley, and W. Soh, Accretion of Japanese island arcs and implications for the origin of Archean greenstone belts, Tectonics, 11, 1224–1244, 1992.
Takahashi, K. and T. Seno, Simulation of diffusion of crustal deformation caused by disturbances arising at plate boundaries: a case of the detachment beneath the Izu Peninsula, Japan, Earth Planets Space, 57, this issue, 935–941, 2005.
Tsukahara, H. and R. Ikeda, Crustal stress orientation pattern in the central part of Honshu, Japan—stress provinces and their origins, J. Geol. Soc. Jpn., 97, 461–474, 1991 (in Japanese).
Ukawa, M., Collision and fan-shaped compressional stress pattern in the Izu block at the northern edge of the Philippine Sea plate, J. Geophys. Res., 96, 713–728, 1991.
Ukawa, M., E. Fujita, E. Yamamoto, Y. Okada, and M. Kikuchi, The 2000 Miyakejima eruption; Crustal deformation and earthquakes observed by the NIED Miyakejima observation network, Earth Planets Space, 52, xix–xxvi, 2000.
Yamaoka, K., What are occurring beneath the Miyake and Kozu islands?, Kagaku, 70, 926–935, 2000 (in Japanese).
Yamaoka, K., T. Kudo, M. Kawamura, F. Kimata, and N. Fujii, Long-lasting dike intrusion in the 2000 eruption of Miyaaejima volcano—Where did the magma come from?, Bull. Volcanol., 67, 231–242, 2005.
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Seno, T. Izu detachment hypothesis: A proposal of a unified cause for the Miyake-Kozu event and the Tokai slow event. Earth Planet Sp 57, 925–934 (2005) doi:10.1186/BF03351872
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