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Spatial and temporal characteristics of low-magnitude seismicity from a dense array in western Nagano Prefecture, Japan

Earth, Planets and Space volume 54, pages 81–89 (2002)Cite this article

Abstract

We analyze an earthquake catalog and waveform data from a dense seismic array in western Nagano Prefecture in order to investigate seismic properties and source parameters. The catalog used here consists of about 30,000 smaller magnitude earthquakes that were located within a source volume of order (10 km)3. Moving window analysis shows that the seismic rate is steady over time and the temporal change in the size distribution of earthquakes shows only statistical fluctuations. Spatial analyses, however, reveals that certain features of seismicity are depth-dependent. At shallow depths (<3 km), we find an increase in average stress drop with depth that may be related to the characteristic depth of seismicity (the depth where the frequency of earthquakes is maximum). The b-value is also found to be elevated throughout depths where the seismicity is most intense but then the b-value slowly decreases as depth increases. Another result from our analysis of waveform data is a clear relation between earthquake magnitude and stress-drop in the magnitude range −0.5 to 2.5.

References

  • Aoki, H., T. Ooida, I. Fujii, and F. Yamazaki, Seismological study of the 1979 eruption of Ontake Volcano, in Investigation of Volcanic Activity and Disasters Caused by the 1979 Eruption of Ontake Volcano, edited by H. Aoki, pp. 55–74, Nagoya, Nagoya University, 1980 (in Japanese).

    Google Scholar 

  • Dysart, P. S., J. A. Snoke, and I. S. Sacks, Source parameters and scaling relations for small earthquakes in the Matsushiro region, southwest Honshu, Japan, Bull. Seismol. Soc. Am., 78, 571–589, 1988.

    Google Scholar 

  • Gomberg, J., Seismicity and detection/location threshold in the Southern Great Basin Seismic Network, J. Geophys. Res., 96, 16401–16414, 1991.

    Article  Google Scholar 

  • Horiuchi, S. and Y. Iio, Stress drop distribution of micro-earthquakes at Ootaki, Nagano Prefecture, Japan, obtained from waveform data by borehole stations, in Seismotectonics at the Convergent Zone, edited by Y. Fujinawa and A. Yoshida, Tokyo, Terra Scientific, 2001.

    Google Scholar 

  • Horiuchi, S., T. Matsuzawa, and A. Hasegawa, Automatic data processing system of seismic waves that works even at times of huge seismic activity, J. Seismol. Soc. Japan, 52, 241–254, 1999.

    Google Scholar 

  • Iio, Y. and K. Yoshioka, Strong ground motion in the source region of the 1984 Western Nagano Prefecture Earthquake, inferred from displaced boulders, J. Phys. Earth, 40, 407–419, 1992.

    Article  Google Scholar 

  • Iio, Y., K. Ikeda, K. Omura, Y. Matsuda, Y. Shiokawa, M. Takeda, and D. Uehara, Conductivity structure of a seismogenic region in the western Nagano prefecture, Butsuri-tansa, 53, 56–66, 2000.

    Google Scholar 

  • Inamori, T., S. Horiuchi, and A. Hasegawa, Location of mid-crustal reflectors by a reflection method using aftershock waveform data in the focal area of the 1984 Western Nagano Prefecture Earthquake, J. Phys. Earth, 40, 379–393, 1992.

    Article  Google Scholar 

  • Jenkins, G. M. and D. G. Watts, Spectral Analysis and Its Applications, San Francisco, Holden-Day, 1968.

    Google Scholar 

  • Mori, J. and R. E. Abercrombie, Depth dependence of earthquake frequency-magnitude distributions in California: implications for rupture initiation, J. Geophys. Res., 102, 15081–15090, 1997.

    Article  Google Scholar 

  • Ooida, T., F. Yamazaki, and I. Fujii, Aftershock activity of the 1984 Western Nagano Prefecture Earthquake, Central Japan, and its relation to earthquake swarms, J. Phys. Earth, 37, 401–416, 1989.

    Article  Google Scholar 

  • Rydelek, P. A. and I. S. Sacks, Testing the completeness of earthquake catalogues and the hypothesis of self-similarity, Nature, 337, 251–253, 1989.

    Article  Google Scholar 

  • Rydelek, P. A. and I. S. Sacks, Comment on “Seismicity and detection/location threshold in the Southern Great Basin seismic network” by Joan Gomberg, J. Geophys. Res., 97, 15361–15362, 1992.

    Article  Google Scholar 

  • Sacks, I. S. and P. A. Rydelek, Earthquake ‘quanta’ as an explanation for observed magnitudes and stress-drops, Bull. Seismol. Soc. Am., 85, 808–813, 1995.

    Google Scholar 

  • Sato, T. and T. Hirasawa, Body wave spectrum from propagating shear cracks, J. Phys. Earth, 21, 415–431, 1973.

    Article  Google Scholar 

  • Seismic Activity Monitoring Center, Seismological Division, J.M.A., Local earthquake at the Kiso district, Rep. Coord. Comm. Earthq. Predict., 17, 78–79, 1977 (in Japanese).

    Google Scholar 

  • Wiemer, S. and M. Wyss, Minimum magnitude of completeness in earthquake catalogs: examples from Alaska, the western United States, and Japan, Bull. Seismol. Soc. Am., 90, 859–869, 2000.

    Article  Google Scholar 

  • Yoshida, S. and K. Koketsu, Simultaneous inversion of waveform and geodetic data for the rupture process of the 1984 Naganoken-Seibu, Japan, earthquake, Geophys. J. Int., 103, 355–362, 1990.

    Article  Google Scholar 

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Authors and Affiliations

  1. Center for Earthquake Research and Information, The University of Memphis, Memphis, TN, 38152, USA

    Paul A. Rydelek

  2. National Research Institute for Earth Science and Disaster Prevention, Science and Technology Agency, Ibaraki, 305-0006, Japan

    Shigeki Horiuchi

  3. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-0032, Japan

    Yoshihisa Iio

Authors
  1. Paul A. Rydelek
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  2. Shigeki Horiuchi
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  3. Yoshihisa Iio
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Correspondence to Paul A. Rydelek.

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Rydelek, P.A., Horiuchi, S. & Iio, Y. Spatial and temporal characteristics of low-magnitude seismicity from a dense array in western Nagano Prefecture, Japan. Earth Planet Sp 54, 81–89 (2002). https://doi.org/10.1186/BF03351709

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  • DOI: https://doi.org/10.1186/BF03351709

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