Skip to main content

Advertisement

Source parameters of the May 29, 2004 South Korea earthquake (ML 5.2)

Article metrics

  • 208 Accesses

  • 8 Citations

Abstract

A moderate earthquake with local magnitude 5.2 (ML) occurred off the eastern coast of South Korea on May 29, 2004. This earthquake is one of the largest events near the Korean Peninsula since 1978 when instrumental observations began by the Korea Meteorological Administration. We carried out modeling of regional waveforms and deconvolutions using empirical Green functions to estimate source parameters. The results of the regional waveform modeling show a reverse fault mechanism with a hypocentral depth of 8 km and seismic moment of 5 × 1016 N · m, which is equivalent to Mw 5.1. Performing the empirical Green function deconvolution, we estimated a fault radius of 1.1 to 1.4 km and an average stress drop of 13.5 MPa, assuming an east dipping fault plane. Assuming a west dipping fault plane, we estimated a fault radius of 1.3 to 2.9 km and an average stress drop of 6.6 MPa.

References

  1. Boatwright, J., A spectral theory for circular seismic sources: simple estimates of source dimension, dynamic stress drops, and radiated energy, Bull. Seism. Soc. Am., 70, 1–28, 1980.

  2. Brune, J. N., Tectonic stress and the spectra of seismic shearwaves from earthquakes, J. Geophys. Res., 75, 4997–5009, 1970.

  3. Cho, H.-M., H.-J. Kim, H.-T. Jou, and J.-K. Hong, Transition from rifted continental to oceanic crust at the southeastern Korean margin in the East Sea (Japan Sea), Geophys. Res. Let., 31, L07606, doi:10.1029/2003GL019107, 2004.

  4. Chough, S. K., H. J. Lee, and S. H. Yoon, Marine geology of Korean Seas, 202 pp, Elsevier Science B. V., Amasterdam, 2000.

  5. Kang, T.-S. and C.-E. Baag, The 19 May 2004, Mw=5.1, offshore Uljin earthquake, Korea, Geoscience J., 8, 115–123, 2004.

  6. Kim, I.-S., Origin and tectonic evolution of the East Sea (Sea of Japan) and the Yangsan Fault system: A new synthetic interpretation, Jour. Geol. Soc. Korea, 28, 84–109, 1992 (in Korean with English abstract).

  7. Kim, S. J. and S. G. Kim, A study on the crustal structure of South Korea by using seismic waves, J. Korean Inst. Mining Geol., 16, 51–61, 1983 (in Korean with English abstract).

  8. Kim, S. K., A study on the crustal structure of the Korean Peninsula, Jour. Geol. Soc. Korea., 31, 393–403, 1995 (in Korean with English abstract).

  9. Lee, G. H., H. J. Kim, M. C. Suh, and J. K. Hong, Crustal structure, volcanism, and opening mode of the Ulleung Basin, East Sea (Sea of Japan), Tectonophysics, 308, 503–525, 1999.

  10. Lee, S. H., S. K. Chough, G. G. Back, and Y. B. Kim, Chirp (2-7-kHz) echo characters of the South Korea Plateau, East Sea: styles of mass movement and sediment gravity flow, Mar. Geol., 184, 227–247, 2002b.

  11. Lee, W. H. K., H. Kanamori, P. C. Jennings, and C. Kisslinger, Earthquake stress drops and plate boundary stresses, in International Handbook of Earthquake & Engineering Seismology, edited by W. H. K. Lee, H. Kanamori, P. C. Jennings, and C. Kisslinger, pp. 548–551, Academic press, London, 2002a.

  12. Mori, J. and A. Frankel, Source parameters for small events associated with the 1986 North Palm Springs, California, earthquake determined using empirical Green functions, Bull. Seism. Soc. Am., 80, 278–295, 1990.

  13. Takeo, M., Near-field synthetic seismograms taking into account the effect of anelasity—The effects of anelastic attenuation on seismograms caused by a sedimentary layer, Pap. Meteo. Geohys., 36, 245–257, 1985 (in Japanese).

Download references

Author information

Correspondence to Sun-Cheon Park.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Park, S., Mori, J. Source parameters of the May 29, 2004 South Korea earthquake (ML 5.2). Earth Planet Sp 57, 471–475 (2005) doi:10.1186/BF03352581

Download citation

Key words

  • Earthquake
  • waveform modeling
  • deconvolution
  • South Korea
  • empirical Green function