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Occurrence of quasi-periodic slow-slip off the east coast of the Boso peninsula, Central Japan

Abstract

An analysis of Global Positioning System (GPS) data revealed south-southeastward transient deformation caused by the expected slow-slip near the Boso peninsula, central Japan, approximately 5 years after a similar event in 2002. An area of aseismic slip with a moment magnitude of 6.6 was estimated off the Boso peninsula, adjacent to the area of associated seismic activity. The 2007 aseismic slip started from around August 10, expanded slightly to the north, and gradually ceased activity over a period of about 10 days. This rupture process is different from those of the last two events in which the slow-slip area moved from north to south. However, the three slow-slip events detected by the GPS array verify the hypothesis that the Boso slow-slips occur quasi-periodically in a certain area, accompanied by seismic swarms. The factors causing the slight differences in the rupture process, magnitude, recurrence time, and slip area among the observed slow-slip events remain unclear.

References

  • Ishida, M., Geometry and relative plate motion of the Philippine sea plate and Pacific plate beneath the Kanto-Tokai district, Japan, J. Geophys. Res., 97(B1), 489–513, 1992.

    Article  Google Scholar 

  • Lohman, R. B. and J. J. McGuire, Earthquake swarms driven by aseisimic creep in the Salton Trough, California, J. Geophys. Res., 112, B04405, doi:10.1029/2006JB004596, 2007.

    Google Scholar 

  • Matsuzawa, T., T. Igarashi, and A. Hasegawa, Characteristic small-scale earthquake sequence off Sanriku, northeastern Honshu, Japan, Geophys. Res. Lett., 29(11), 38–1–38–4, 2002.

    Article  Google Scholar 

  • NIED, Slow-slip event detected by continuous tilt observation, occurred around eastern Boso peninsula on Oct., 2002, Rep. Coord. Commit. Earthq., Pred., 69, 198–204, 2003.

    Google Scholar 

  • NIED, Seismic swarm activity off the east coast of the Boso peninsula, August 2007, Rep. Coord. Commit. Earthq., Pred., 2007 (in press).

    Google Scholar 

  • Ozawa, S., M. Murakami, and T. Tada, Time-dependent inversion study of the slow thrust event in the Nankai trough subduction zone, southwestern Japan, J. Geophys. Res., 106(B1), 787, 2001.

    Article  Google Scholar 

  • Ozawa, S., S. Miyazaki, Y. Hatanaka, T. Imakiire, M. Kaidzu, and M. Murakami, Characteristic silent earthquakes in the eastern part of the Boso peninsula, Central Japan, Geophys. Res. Lett., 30, doi: 10.1029/2002GL016665, 2003.

  • Sagiya, T., Interplate coupling in the Kanto district, central Japan, and the Boso Peninsula silent earthquake in May 1996, PAGEOPH, 161(11-12), 2601–2616, 2004.

    Article  Google Scholar 

  • Segall, P. and M. Matthews, Time dependent inversion of geodetic data, J. Geophys. Res., 102, 22391, 1997.

    Article  Google Scholar 

  • Shibazaki, B. and Y. Iio, On the physical mechanism of silent slip events along the deeper part of the seismogenic zone, Geophys. Res. Lett., 30, 2003GL017047, 2003.

    Article  Google Scholar 

  • Takeda, T., K. Kasahara, and H. Kimura, Geometry of the Philippine Sea plate in and around the Sagami trough—Digital restoration from paper record of multi-channel seismic data—, in Japanese, Monthly Chikyu, 57, 115–123, 2007.

    Google Scholar 

  • Yabuki, T. and M. Matsu’ura, Geodetic data inversion using Bayesian information criterion for spatial distribution of fault slip, Geophys. J. Int., 109, 363–375, 1992.

    Article  Google Scholar 

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Correspondence to Shinzaburo Ozawa.

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Ozawa, S., Suito, H. & Tobita, M. Occurrence of quasi-periodic slow-slip off the east coast of the Boso peninsula, Central Japan. Earth Planet Sp 59, 1241–1245 (2007). https://doi.org/10.1186/BF03352072

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  • DOI: https://doi.org/10.1186/BF03352072

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