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Change of strain rate and seismicity in the Chubu district, central Japan, associated with a Tokai slow event
Earth, Planets and Space volume 59, pages351–361(2007)
We have evaluated temporal variation in strain rates in the Chubu and Kinki districts, central Japan, between 1997 and 2004 using continuous GPS data of GEONET. We found that strain rates throughout the southern part of Chubu district, including the Yoro fault and Nobi fault zone, have significantly deviated from the secular crustal deformation pattern since at least 2001. The results of an inversion procedure show that the strain rate change can be well explained by a slow slip beneath the Tokai area, suggesting that the Tokai slow event has significantly affected the crustal deformation not only in the Tokai area but also in an area located more than 100 km from the main slip area of the event. We also found that the seismicity rate has clearly decreased by approximately 50% around the Yoro fault since the latter half of 2000. The δCFF inferred from our Tokai slow slip model agrees with the observed reduction in seismicity. These results were interpreted as indicating that the seismicity, which has been decreasing for several years, is controlled by the reduction in the shear stressing-rate due to the Tokai slow slip.
Akaike, H., Likelihood and the Bayes procedure, in Bayesian Statistics, edited by J. M. Bernardo, M. H. DeGroot, D. V. Lindley, and A. F. M. Smith, 143–166 pp., University Press, Valencia, Spain, 1980.
Dieterich, J., A constitutive law for rate of earthquake production and its application to earthquake clustering, J. Geophys. Res., 99, 2601–2618, 1994.
Habermann, R. E., Teleseismic detection in the Aleutian Island Arc, J. Geophys. Res., 88, 5056–5064, 1983.
Harris, R. A. and R. W. Simpson, Changes in static stress on southern California faults after the 1992 Landers earthquake, Nature, 360, 251–254, 1992.
Hashimoto, M., Static Stress Changes Associated with the Kobe Earthquake: Calculation of Changes in Coulomb Failure Function and Comparison with Seismicity Change, J. Seismol. Soc. Japan, 48, 521–530, 1995 (in Japanese with English abstract). (Correction to “Static Stress Changes Associated with the Kobe Earthquake: Calculation of Changes in Coulomb Failure Function and Comparison with Seismicity Change”, J. Seismol. Soc. Japan, 50, 21–27, 1997.)
Hashimoto, M., K. Onoue, F. Ohya, Y. Hoso, K. Segawa, K. Sato, and Y. Fujita, Crustal deformations in Kii peninsula associated with the SE off the Kii peninsula earthquake sequence of September 5, 2004 derived from dense GPS observations, Earth Planets Space, 57, 1–6, 2005.
Ishida, M., Geometry and relative motion of the Philippine sea plate and Pacific plate beneath the Kanto-Tokai district, Japan, J. Geophys. Res., 97, 489–513, 1992.
Jaume, S. C. and L. R. Sykes, Change in the state of stress on the southern San Andreas fault resulting from the California earthquake sequence of April to June 1992, Science, 258, 1325–1328, 1992.
Kimata, F., K. Hirahara, N. Fujii, and H. Hirose, Repeated occurrence of slow slip events on the subducting plate interface in the Tokai region, central Japan, the focal region of the anticipated Tokai earthquake (M=8), EOS Trans. AGU Fall Meeting Suppl., 82, 2001.
Kobayashi, A. and A. Yoshida, Recurrence of the Tokai slow slip inferred from the tide gauge data at Maisaka, J. Geod. Soc. Jpn., 50, 209–212, 2004 (in Japanese with English abstract).
Kobayashi, A., A. Yoshida, T. Yamamoto, and H. Takayama, Slow slip in the focal region of the anticipated Tokai earthquake following the seismo-volcanic event in the northern Izu Islands in 2000, Earth Planets Space, 57, 507–513, 2005.
Matsumura, S., Seismicity rate changes in the inferred locked zone of the Tokai region in the latter half of 1990’s, J. Seismol. Soc. Japan, 54, 449–463, 2002 (in Japanese with English abstract).
Matsumura, S., Seismicity activity and its change beneath Lake Hamana in the Tokai region (Seismic activity change in the Tokai region: Part 3), J. Seismol. Soc. Japan, 58, 55–65, 2005 (in Japanese with English abstract).
Miyoshi, T. and K. Ishibashi, Geometry of the seismic Philippine Sea slab beneath the region from Ise Bay to western Shikoku, southwest Japan, J. Seismol. Soc. Japan, 57, 139–152, 2004 (in Japanese with English abstract).
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., 28, 3745–3748, 2001.
Okada, Y., Surface deformation due to shear and tensile faults in a halfspace, Bull. Seismol. 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, 1009–1012, 2002.
Ozawa, S., S. Miyazaki, T. Nishimura, M. Murakami, M. Kaidzu, T. Imakiire, and X. Ji, Creep, dike intrusion, and magma chamber deflation model for the 2000 Miyake eruption and the Izu islands earthquakes, J. Geophys. Res., 109, doi:10.1029/2003JB002601, 2004.
Ozawa, S., M. Murakami, M. Kaidzu, and Y. Hatanaka, Transient crustal deformation in Tokai region, central Japan, until May 2004, Earth Planets Space, 57, 909–915, 2005.
Reasenberg, P., Second-order moment of Central California seismicity, 1969–1982, J. Geophys. Res., 90, 5479–5495, 1985.
Sagiya, T., S. Miyazaki, and T. Tada, Continuous GPS array and presentday crustal deformation of Japan, Pure. Appl. Geophys., 157, 2303–2322, 2000.
Shen, Z., D. D. Jackson, and B. X. Ge, Crustal Deformation Across and Beyond the Los Angels Basin from Geodetic Measurements, J. Geophys. Res., 101, 27951–27980, 1996.
Stein, R. S., The role of stress transfer in earthquake occurrence, Nature, 402, 605–609, 1999.
Stein, R. S., G. C. P. King, and J. Lin, Change in failure stress on the southern San Andreas fault system caused by the 1992 magnitude=7.4 Landers earthquake, Science, 258, 1328–1332, 1992.
Stein, R. S., G. C. P. King, and J. Lin, Stress triggering of the 1994 M=6.7 Northridge, California earthquake by its predecessors, Science, 265, 1432–1435, 1994.
Toda, S., R. S. Stein, P. A. Reasenberg, J. H. Dieterich, and A. Yoshida, Stress transferred by the 1995 Mw = 6.9 Kobe, Japan, shock: Effect on aftershocks and future earthquake probabilities, J. Geophys. Res., 103, 24543–24565, 1998.
Toda, S. and R. S. Stein, Response of the San Andreas fault to the 1983 Coalinga-Nuñez earthquake: An application of interactionbased probabilities for Parkfield, J. Geophys. Res., 107, doi: 10.1029/2001JB000172, 2002.
Toda, S., R. S. Stein, and T. Sagiya, Evidence from the AD 2000 Izu islands earthquake swarm that stressing rate governs seismicity, Nature, 419, 58–61, 2002.
Wessel, P. and W. H. Smith, New, improved version of Generic Mapping Tools released, EOS Trans. Am. Geophys. Union, 79, 579, 1998.
Yoshikawa, S., Space and time variation of strain promoted by the slow slip event in the Tokai area revealed by GPS data, Bull. Earthq. Res. Inst., 78, 255–267, 2003.
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Kobayashi, T., Hashimoto, M. Change of strain rate and seismicity in the Chubu district, central Japan, associated with a Tokai slow event. Earth Planet Sp 59, 351–361 (2007). https://doi.org/10.1186/BF03352695
- Strain rate change
- seismicity change
- Tokai slow event
- static stress change