A Study on the Intensity and Energy Attenuation of the 13 December 1996 Yeongweol Earthquake, Korea

1996년 12월 13일 영월 지진의 진도 및 에너지감쇠에 관한 연구

  • Published : 1997.03.01

Abstract

An intensity survey on the 13 December 1996 Yeogweol earthquake has mode for 262 locations throughout southern part of Korean peninsula, then we investigated attenuation properties in the south Korean region as well as intensities distribution. In this study, intensities are estimated to be from II to possibly VIII. The iso-seismal intensity map we obtained shows general pattern of intensity distribution in the south korean region quite clearly despite the inherent uncertainties included in the process of intensity estimation. In case of intensity larger than VI, considerable damages such as fracturing walls are frequently reported. One of the significant feature of this intensity map is, considering its magnitude 4.5 reported by KMA, the felt area is unusually large covering most of the Korean Peninsular except Cheju island. This result indicates either the magnitude is under estimated or the focal depth is much deeper than expected. Assuming indicates either the magnitude is under estimated or the focal depth is much deeper than expected. Assuming shallow earthquake whose focal depth is by iso-seismal contour lines for intensity IV to VII, respectively. To resolve this ambiguity, more reliable estimation of focal depth and magnitude by using telesesmic instrumental records should be made in the future.

References

  1. Ph. D Thesis, Seoul Nat. Univ. The Characteristics of the Seismicity of the Korean Peninsula Kyung, J.B.
  2. J. Korean Earth Science Soc. Estimation of intensity of the 24 January 1996 East Sea Earthquake(M=4.2) Kyung, J.B.;Han, S.S.
  3. Teconophys. v.178 Stress field in the continental part of China derived from temporal variations of seismic activity Zhao, Z.X.;Oike, K.;Matsumura, K.;Ishkawa, Y.
  4. Korean Earthquake Catalogue, the Seismological Institute Kim, S.G.;Gao, F.C.
  5. Bull. Seism. Soc. Am. v.77 The $M_L$scale in southern California Hutton, L.K.;Boore, D.M>
  6. Proc. Earthquake Engineering and Soil Dynamics II Measurement, characterization, and prediction of strong ground motion Joymer, W. B.;Boore, D.M.
  7. Bull. Seism. Soc. Am. v.81 The $M_L$scale in Norway Alsaker, A.;Kvamme, L.B.;Hansen, R.A.;Dahle, A.;Bungum, H.
  8. Bull. Seism. Soc. Am. v.71 The character of high frequency strong ground motion Hanks, T.C.;McGuire, R.K.
  9. Bull. Meteor. Obs. Gov. General Kor. v.1 Report of SSanggye-Sa strong earthquake on the southern foot of Mount Chiri(in Japanese) Hayata, K.
  10. J. Geol. Soc. Kor. v.20 no.2 A study on intensity attenuation in the Korean peninsula Lee, K.
  11. Bull. Seism. Soc. Am. v.65 Theoretical basis of some empirical relations in seismology Kanamori, H.;Anderson, D.L.
  12. U.S. Geol. Surv. Prof. Pap. v.1223 Seismic intensites of conterminous United States Their prediction and interpretation Evernden, J.E.;Kohler, W.M.;Clow, G.D.
  13. Bull. Seism. Soc. Am. v.72 A dynamic model for far field acceleration Boatwright, J.
  14. Bull. Seism. Soc. Am. v.82 Common features of the excitation and propagation of strong ground motion for North American earthquakes Hanks, T.C.;Johnston, A.C.
  15. Bull. Seism. Soc. Am. v.65 On the correlation of seismic intensity scales with the peaks of recorded strong ground motion Trifunac, M.D.;Brady, A.G.