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S-wave Velocity Structure Beneath the KS31 Seismic Station in Wonju, Korea Using the Joint Inversion of Receiver Functions and Surface-wave Dispersion Curves and the H-κ Stacking Method

수신함수와 표면파 분산곡선의 복합역산 및 수신함수 H-κ 중첩법을 이용한 원주 KS31 지진관측소 하부의 S파 지각 속도구조

  • 전태현 (한국지질자원연구원 국토지질연구본부) ;
  • 김기영 (강원대학교 지구물리학과) ;
  • 박용철 (극지연구소 극지지구시스템연구부) ;
  • 강익범 (한국지질자원연구원 국토지질연구본부)
  • Received : 2012.01.03
  • Accepted : 2012.02.10
  • Published : 2012.02.29

Abstract

To estimate the S-wave velocity structure beneath the KS31 broad-band station in Wonju, Korea, we used $H-{\kappa}$ stacking and joint inversion of receiver functions and surface-wave dispersion curves derived from 297 teleseismic events (Mw > 5.5) recorded during the period between 2002 and 2009. We thereby determined that the average depth to a nearly flat Moho is $32.4{\pm}0.5\;km$ within tens of kilometer radius of the seismic station. For the crust at this location, we estimate an average shear-wave velocity of 3.69 km/s and a ratio of P- to S-wave velocities, $V_p/V_s$, of $1.72{\pm}0.04$, as is typical for continental crust. A negative phase in the receiver functions at 1 s indicates the presence of a shearwave low velocity layer in a depth interval of 10 to 18 km in the upper crust beneath the KS31 station.

Acknowledgement

Supported by : 기상청

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