Skip to main content

Spatial distribution of static stress drops for aftershocks of the 2005 West Off Fukuoka Prefecture earthquake


We investigated the spatial distribution of static stress drops of the aftershocks of the 2005 West Off Fukuoka Prefecture earthquake, with the aim of assessing the possibility that another earthquake will occur on the SE extension of the earthquake fault. The waveforms from six temporary online telemetry stations installed in and around the aftershock region were measured. Small stress drops were estimated for the aftershocks that occurred relatively distant from the SE and NE ends of the earthquake fault. Conversely, the aftershocks that occurred around the SE end of aftershock region are characterized by large stress drops. These results imply the possibility of a stress concentration at the SE edge of the main shock fault.


  • Asano, K. and T. Iwata, Source process and near-source ground motions of the 2005 West Off Fukuoka Prefecture earthquake, Earth Planets Space, 58, 93–98, 2

    Article  Google Scholar 

  • Boatwright, J., Detailed spectral analysis of two small New York state earthquakes, Bull. Seismol. Soc. Am., 68, 1177–1131, 1978.

    Google Scholar 

  • Geographical Survey Institute, Earthquake: Mj7.0 in West-off Fukuoka pref. (Northern Kyushu), on 20 March 2005,, 2005.

    Google Scholar 

  • Hanks, T. C. and M. Wyss, The use of body wave spectra in the determination of seismic source parameters, Bull. Seismol. Soc. Am., 62, 561–569, 1972.

    Google Scholar 

  • Iio, Y., A new empirical method to estimate the site response by stacking observed velocity waveforms, 2006 (in preparation).

    Google Scholar 

  • Iio, Y. and Y. Kobayashi, A physical understanding of large intraplate earthquakes, Earth Planets Space, 54, 1001–1004, 2002.

    Article  Google Scholar 

  • Jin, A. and E. Fukuyama, Seismic Energy for Shallow Earthquakes in Southwest Japan, Bull. Seismolog. Soc. Am., 95, 1314–1333, 2005.

    Article  Google Scholar 

  • Kinoshita, S. and M. Ohike, Scaling Relations of Earthquakes That Occurred in the Upper Part of the Philippine Sea Plate beneath the Kanto Region, Japan, Estimated by Means of Borehole Recordings, Bull. Seis-mol. Soc. Am., 92(2), 611–624, DOI: 10.1785/0120010134, 2002.

    Article  Google Scholar 

  • Ogasawara, H., S. Sato, S. Nishi, H. Kawakata, and the research group for Semi-controlled earthquake-generation experiments in South African deep gold mines, Temporal variation of seismic parameters associated with an Mw2 event monitored at a 100–200 m distance, Seismogenic Process Monitoring, 173–184, Balkema, Rotterdam, 2002.

    Google Scholar 

  • Research Group for Active Faults of Japan, Active faults in Japan, sheet maps and inventories, Univ. of Tokyo Press, Tokyo, 1980.

    Google Scholar 

  • Shimizu, H., H. Takahashi, T. Okada, T. Kanazawa, Y. Iio, H. Miyamachi, T. Matsushima, M. Ichiyanagi, N. Uchida, T. Iwasaki, H. Katao, K. Goto, S. Matsumoto, N. Hirata, S. Nakao, K. Uehira, M. Shinohara, H Yakiwara, N. Kame, T. Urabe, N. Matsuwo, T. Yamada, A. Watanabe, K. Nakahigashi, B. Enescu, K. Uchida, S. Hashimoto, S. Hirano, T. Yagi, Y. Kohno, T. Ueno, M. Saito, and M. Hori, Aftershock seismicity and fault structure of the 2005 West Off Fukuoka Prefecture Earthquake (MJMA7.0) derived from urgent joint observations, Earth Planets Space, 58, this issue, 1599–1604, 2006.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to Yoshihisa Iio.

Rights and permissions

Open Access  This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

To view a copy of this licence, visit

Reprints and permissions

About this article

Cite this article

Iio, Y., Katao, H., Ueno, T. et al. Spatial distribution of static stress drops for aftershocks of the 2005 West Off Fukuoka Prefecture earthquake. Earth Planet Sp 58, 1611–1615 (2006).

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI:

Key words