HR: 1330h
AN: S42E-0208    [PDF]
TI: Surface-Wave Focal Mechanism of the 30 March 2003 Yellow-Sea Earthquake Event
AU: * Nguyen, B V
EM: bao@aftac.gov
AF: HQ AFTAC/TTR, 1030 S. Highway A1A, Patrick AFB, FL 32925 United States
AB: The Yellow-Sea earthquake event of 30 March 2003 was reported by the USGS as follows: mb = 4.7, Origin Time = 11:10:55.98, Latitude = 37.57 N, Longitude = 123.82 E. In this study, the focal mechanism of this event will be shown. Corrected Love-wave and Rayleigh-wave amplitude data from ten CDSN stations and the station TATO were used in the search for focal mechanism employing the technique of Nguyen and Herrmann (1992, SRL). Eigenfunctions were computed from the average crustal model that was obtained by inversion from surface-wave group velocities of these stations. Surface-wave attenuation coefficients were obtained using the technique of Tsai and Aki (1969). The focal mechanism of this event has a nodal plane with dip= 70 deg., slip = 50 deg., and strike = 35 deg. P-wave first motions were used to constrain the nodal planes. The seismic moment obtained is 5.50E+22 dyne-cm. The source depth is 6 km. Velocity and Q models obtained by inversions and synthetic seismograms to predict the observed will also be presented.
DE: 7215 Earthquake parameters
DE: 7230 Seismicity and seismotectonics
DE: 7255 Surface waves and free oscillations
SC: Seismology [S]
MN: 2003 Fall Meeting