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| | Abstract | | To elucidate a plausible mechanism for seismic attenuation, the joint use of both P- and S-waves will provide more helpful information because these two types of waves respond differently to fluid and solid combinations. However, observation of S-wave is often difficult due to poor coupling between an ultrasonic transducer and partially frozen unconsolidated sediments. Ultrasonic wave transmission measurements were conducted in order to examine the influence of ice-brine coexisting system grown in unconsolidated porous material on ultrasonic S-waves. The waveform analyses for S-waves indicate that the attenuation curves reach their peak at a temperature of -5 degrees Celsius and gradually decrease with decreasing temperature. Our observation of the variation of attenuation and velocity of P- and S-wave with changing temperature indicates the possibilities of the joint use of both P- and S-waves to elucidate a plausible mechanism for seismic attenuation. |
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