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Earth, Planets and Space

, Volume 60, Issue 7, pp 781–784 | Cite as

Temporal characteristics of high band-pass filtered teleseismic P-waveforms from large shallow earthquakes

  • Tatsuhiko Hara
Open Access
Letter

Abstract

We measured time differences between P-wave arrivals and the times at which squared amplitudes of high bandpass (2–4 Hz) filtered P-waves became the largest for large shallow earthquakes that occurred during the period 1995–2007. The time differences were then normalized by twice the centroid time shift for the corresponding earthquakes. We found that most of the seismograms had normalized time differences that congregated at about 50% (corresponding to centroid time shifts). Few normalized time differences were found in the 0–20% range. These results support the use of this time difference to infer the order of the source duration and, thereby, the effectiveness of the duration measurement procedure of the high-frequency energy radiation that we recently developed.

Key words

High-frequency energy radiation shallow earthquake 

References

  1. Chen, Y., J. Huang, S. Ni, and Y. Chen, Slow rupture velocity of the July 17th, 2006 Java earthquake from high frequency analysis, Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract S21A-0128, 2006.Google Scholar
  2. Frohlich, C. and K. D. Apperson, Earthquake focal mechanisms, moment tensors, and the consistency of seismic activity near plate boundaries, Tectonics, 11, 279–296, 1992.CrossRefGoogle Scholar
  3. Goldstein, P., D. Dodge, M. Firpo, L. Minner, J. E. Tull, Harris, and W. C. Tapley, SAC—Seismic Analysis Code, http://www.iris.edu/manuals/sac/manual.html, 2007.Google Scholar
  4. Gusev, A. A., E. M. Guseva, and G. F. Panza, Size and duration of the high-frequency radiator in the source of the 2004 December 26 Sumatra earthquake, Geophys. J. Int., 170, 1119–1128, doi:10.1111/j.1365-246X.2007.03368.x, 2007.CrossRefGoogle Scholar
  5. Hara, T., Measurement of the duration of high-frequency energy radiation and its application to determination of the magnitudes of large shallow earthquakes, Earth Planets Space, 59, 227–231, 2007a.CrossRefGoogle Scholar
  6. Hara, T., Magnitude determination using duration of high frequency energy radiation and displacement amplitude: application to tsunami earthquakes, Earth Planets Space, 59, 561–565, 2007b.CrossRefGoogle Scholar
  7. Henry, C., S. Das, and J. H. Woodhouse, The great March 25, 1998, Antarctic Plate earthquake: Moment tensor and rupture history, J. Geophys. Res., 105, 16097–16118, 2000.CrossRefGoogle Scholar
  8. Lomax, A., Rapid estimation of rupture extent for large earthquakes: Application to the 2004, M9 Sumatra-Andaman mega-thrust, Geophys. Res. Lett., 32, L10314, doi:10.1029/2005GL022437, 2005.CrossRefGoogle Scholar
  9. Lomax, A. and A. Michelini, Rapid determination of earthquake size for hazard warning, Eos Trans. AGU, 86(21), 202, 2005.CrossRefGoogle Scholar
  10. Lomax, A., A. Michelini, and A. Piatanesi, An energy-duration procedure for rapid determination of earthquake magnitude and tsunamigenic potential, Geophys. J. Int., 170, doi:10.1111/j.1365-246X.2007.03469.x, 1195–1209, 2007.CrossRefGoogle Scholar
  11. Ni, S., H. Kanamori, and D. Helmberger, Energy radiation from the Sumatra earthquake, Nature, 434, 582, 2005.CrossRefGoogle Scholar
  12. Park, J., K. Anderson, R. Aster, R. Butler, T. Lay, and D. Simpson, Global seismographic network records the great Sumatra-Andaman earthquake, Eos Trans. AGU, 86(6), 57, 2005.CrossRefGoogle Scholar
  13. Ritter, J. R. R., P. M. Mai, G. Stoll, and K. Fuchs, Scattering of teleseismic waves in the lower crust Observations in the Massif Central, France, Phys. Earth Planet. Inter., 104, 127–146, 1997.CrossRefGoogle Scholar
  14. Shearer, P. M. and P. S. Earle, The global short-period wavefield modelled with a Monte Carlo seismic phonon method, Geophys. J. Int., 158, 1103–1117, 2004.CrossRefGoogle Scholar
  15. Wessel, P. and W. H. F. Smith, New, improved version of the Generic Mapping Tools released, EOS Trans. AGU, 79(47), 579, 1998.CrossRefGoogle Scholar

Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2008

Authors and Affiliations

  1. 1.International Institute of Seismology and Earthquake EngineeringBuilding Research InstituteTsukuba, IbarakiJapan

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