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AbstmctCritically refraeted seismic waves can be utilized in elucidation of physical proprties of a high-impedance aeorrstic basemen~where n!flection methods are not effective in general. Quality factor Q was estimated for the high-impedance acoustic basement in the eontinentd shelf of the East Sea Kom.Various pre-processing steps for the estimation included static correction for gun delay, geometric corrwtio% data interpolation and Fourier trrmsform. Based on the constant Q model, quality factor was computed for the upper-most layer within the basement using the speetrsl-ratio method. The computation gives values between 10.4 and 13.6, which fall under the range for water-saturated ctaadc sedimentary reeks.Using seismic events refraeted from the layer boundaries within the acoustic basement in the study are% sedimentary layers were successfully defined. A shorl window AGC (automatic gain control) is an effective tool to reveal existence of the refmetion boundaries. Based on a model for horizontal layers, refmction velocity and thickness were computed for each layer under a short seismic line of 3.75 km long in the continental shelf Fmm four distinct linear events, three layers wem interpreted under the water body of 150 m deep. The computed thickness is 275 m for the top layer and 200 m for the middle one. The corresponding refraction velocities are approximately 3900 Iwk and 5100 rrds, mpectively, The refraction event from the top of the lowest layer suggests that its phase velocity is greater than 6400 Ids.
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