Special Issue: Special Section for the 2007 Noto Hanto Earthquake (2)
- Open Access
Automatic determination of source parameters of the 2007 Noto Hanto earthquake
Earth, Planets and Space volume 60, pages 1053–1057 (2008)
Large earthquakes have been observed to be caused by the rupture of several asperities. The rapid determination of source parameters is hence of great importance for correctly determining shaking intensities or evaluating the strong motion distribution generated by a large earthquake. This study shows that we can automatically preprocess strong motion data using automatic P- and S-phase pickers, determine the focal mechanism, and identify the fault plane from two nodal planes. A real-time simulation is performed for the 2007 Noto Hanto earthquake. Using our automatic fault plane identificator, we were able to identify one of the nodal planes with a strike of 62° and a dip of 70° within a 30-s interval from the beginning of focal mechanism determination to the end of waveform inversion. Results from automatic inversions showed that the slip was confined to a shallow portion with a maximum slip of about 3 m. The total seismic moment released in 10 s was 2.0×1018 N m, which corresponds to a moment magnitude of 6.8.
Aki, K. and P. G. Richards, Quantitative seismology, Freeman and Company, San Francisco, 1980.
Cichowicz, A., An automatic S-phase picker, Bull. Seismol. Soc. Am., 83, 180–189, 1993.
Dreger, D. S. and A. Kaverina, Seismic remote sensing for the earthquake source process and near-source strong shaking: a case study of the October 16, 1999 Hector Mine earthquake, Geophys. Res. Lett., 27, 1941–1944, 2000.
Hori, S., Automated methods for rapid estimation of a seismic fault plane, Research Report of National Research Institute for Earth Science and Disaster Prevention, No. 65, 1–23, 2004.
Horiuchi, S., H. Negishi, K. Abe, A. Kamimura, and Y. Fujinawa, An automatic process system for broadcasting earthquake alarms, Bull. Seismol. Soc. Am., 95, 708–718, 2005.
Ji, C., D. J. Wald, and D. V. Helmberger, Source Description of the 1999 Hector Mine, California, Earthquake, Part II: Complexity of Slip History, Bull. Seismol. Soc. Am., 92, 1208–1226, 2002.
Kennett, L. N. and N. J. Kerry, Seismic waves in a stratified half space, Geophys. J. R. Astr. Soc., 57, 557–583, 1979.
Kuge, K., Source modeling using strong-motion waveforms: toward automated determination of earthquake fault planes and moment-release distribution, Bull. Seismol. Soc. Am., 93, 639–654, 2003.
Obara, K., K. Kasahara, S. Hori, and Y. Okada, A densely distributed high-sensitivity seismograph network in Japan: Hi-net by National Research Institute for Earth Science and Disaster Prevention, Rev. Sci. Instrum., 76, 021301–1–12, 2005.
Oonincx, P. J., A wavelet method for detecting S-wave in seismic data, Computational Geoscience, 3, 113–134, 1999.
Ukawa, M., M. Ishida, S. Matsumura, and K. Kasahara, Hypocenter determination method of the Kanto-Tokai observational network for mi-croearthquakes, Rep. Natl. Res. Inst. Earth Sci. Disas. Prev., 53, 1–88, 1984.
Wu, C. and M. Takeo, An intermediate deep earthquake rupturing on a dip-bending fault: Waveform analysis of the 2003 Miyagi-ken Oki earthquake, Geophys. Res. Lett., 31, doi:10.1029/2004GL021228, 2004.
Yamamoto, S., S. Horiuchi, H. Nakamura, and C. Wu, Effectiveness of seismic intensity magnitude for earthquake early warning, Geophys. Explora., 2007 (in Japanese) (in press).
Yamanaka, Y., The March 25, 2007, Noto Hanto earthquake, EIC Seismol. Note, No. 185, 2007.
Yamanaka, Y. and M. Kikuchi, Asperity map along the subduction zone in northeastern Japan inferred from regional seismic data, J. Geophys. Res., 109, doi:10.1029/2003JB002683, 2004.
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Wu, C., Horiuchi, S. Automatic determination of source parameters of the 2007 Noto Hanto earthquake. Earth Planet Sp 60, 1053–1057 (2008). https://doi.org/10.1186/BF03352868
- source parameter
- rupture process