Crustal Structure of the Korean Peninsula By Travel Time Inversion of Local Earthquakes

  • Received : 0
  • Accepted : 0
  • Published : 0

Abstract

Simultaneous inversion of first-arrivals of local earthquakes recorded by the Korea Meteorological Administration(KMA) seismograph network from 1991 to 1998 is made to derive 1D crustal velocity structure of the Korean peninsula. Twenty-nine events with 178 observations are used in the inversion. Average crustal P-wave velocity turns out to be about 6.3 km/sec, and crustal thickness and upper mantle P-wave velocity are estimated as 33 km and 7.9 km/sec, respectively. Results of inversion indicate the possibility of the low velocity layer in the lower crust. Joint inversion is applied to estimate hypocenters, station delays, and velocities simultaneously. Relative station corrections for 11 stations range from zero to about 1.2 sec. Analysis of the synthetic data shows that estimates of hypocenter locations and station corrections as well as averaged crustal structure are reliable for the given data set..

References

  1. A homogeneous initial model, Journal of Geophysical Research v.81 Determinationa of three-dimensional velocity anomalies under a seismic array using first P arrval times from local earthquakes 1. Aki, K.;Lee, W. H. K.
  2. Journal of Geological Society of Korea v.32 Isostasy in and around the Korean peninsula by analyzing gravity and topography data Choi, K. S.;Shin, Y. H.
  3. Journal of Geophysical Research v.100 Seismic velocity structure and composition of the continental crust: a global view Christensen, N. I.;Mooney, W. D.
  4. Journal of Geophysical Research v.81 Crustal structure modeling of earthquake data. 1. Simultaneous least squares estimation of hypocenter and velocity parameters Crosson, R. S.
  5. Journal of Geophysical Research v.81 Crustal structure modeling of earthquake dara. 2. Velocity structure of the Puget Sound region Crossson, R. S.
  6. Journal of Geophysical Research v.84 Seismic velocity structure below the island of Hawaii from local earthquake data Crosson, R. S.;Koyanagi, R. Y.
  7. Journal of Geophysical Research v.103 Three-dimensional velocity structure and earthquake locations beneath the northern Tien Shan of Kyrgyzstan, central Asia Ghose, S.;Hamburger, M. W.
  8. Bulletin of Seismological Society of America v.80 The effect of S-wave arrival times on the accuracy of hypocenter estimation Gomberg, J. S.;Shedlock, K. M.;Roecker, S. W.
  9. Bulletin of Seismological Society of America v.69 Inversion of phase times for hypocenters and shallow crustal velocities Hileman, J. A.
  10. Journal of Geophysical Research v.101 Velocity structure and seismicity of southeastern Tennessee Kaufmann, R. D.;Long, L. T.
  11. The Journal of the Korean Institute Mining Geology v.16 A Study on the crustal structure of south Korea by using seismic waves Kim, S. J.;Kim, S. G.
  12. Journal of the Geological Society of Korea v.31 A Study on the crustal structure of the Korean peninsula Kim, S. K.
  13. The Journal of the Korean Institute of Mining Geology v.18 Crustal structure of the southern part of Korea Kim, S. K. ;Jung, B. H.
  14. Journal of Geophysical Research v.99 Initial reference models in local earthquake tomography Kissling, E.;Ellsworth, W. L.;Eberhart-Phillips, D.;Kradolfer, U.
  15. The Journal of the Korean Institute of Mining Geology v.18 A Study on the crustal structure of the southern Korean peninsula through gravity analysis Kwon, B. D.;Yang, S. Y.
  16. Journal of the Geological Society of Korea v.15 On crustal structure of the Korean peninsula Lee, K.
  17. Earthquakes, in Geology of Korea Lee, K.;D. S. Lee(ed.)
  18. Advances on Geophysics no.SUP.2 Principles and applications of microearthquake networks Lee, W. H. K.
  19. Geological Survey Open-File Report HYPO71(revised): A computer program for determining hypocenter, magnitude, and first motion pattern of local earthquakes Lee, W. H. K.;Lahr, J. C.
  20. Tectonophysics v.288 Crustal structure of China from deep seismic sounding profiles Li, S.;Moomey, W. D.
  21. Bulletin of Seismological Society of America v.86 Hypocentral parameters and velocity estimation in the western Swiss Alps by simultaneous inversion of P- and S- wave data Maurer, H.;Kradolfer, U.
  22. Journal of Geophysical Research v.85 The mixed discrete continuous inverse problem: application to the simultaneous determination of earthquake hprocenters and velocity structure Pavlis, G.;Booker, J.
  23. Journal of Geophysical Research v.86 Simultaneous inversion for earthquake location and velocity structure beneath central Costa Rica Protti, M.;Schwartz, S. Y.;Zandt, G.
  24. Bulletin of Seismological Society of America v.78 Comments on the Joint determination of hypocenters and station corrections Pujol, J.
  25. Journal of Geophysical Research v.87 Velocity structure of the Pamir-Hindy Kush region: Possible evidence of subducted crust Roecker, S. W.
  26. Journal of Geophysical Research v.92 Three-dimensional P and S wave velocity structures beneath Taiwan: Deep structure beneath an arccontinent collision Roecker, S. W.;Yeh, Y. H.;Tsai, Y. B.
  27. Bulletin of Seismological Society of America v.75 Determination of elastic wave velocity and relative hypocenter locations using refracted waves. I. Methodology Shedlock, K. M.;Roecker, S. W.
  28. Geophys. Journal of Royal Astronomical Society v.63 Travel-time inversion for simultaneous earthquake location and velocity structure determication in laterally varying media Spencer, C.;Gubbins, D.
  29. Bulletin of Seismological Society of America v.68 P-velocity models of the southern Diablo range, California, from inversion of earthquake and explosoin arrival times Steppe, J. A.;Crosson, R. S.
  30. Journal of Geophysical Research v.88 Earthquake locations and threedemensional crustal structure in the Coyote Lake Area, central California Thurber, C. H.