报告题目：Shear-wave estimation from different type of sediments

(不同类型沉积物的横波估计)

报告人：Prof. Hefeng Dong

Norwegian University of Science and Technology Trondheim, Norway

主持人：崔志文教授

报告时间：2017年7月7日13:30

报告地点：物理楼333报告厅

主办单位：

吉林大学物理学院

超硬材料国家重点实验室

中国声学学会物理声学分会

中国计算物理学会吉林省分会

高等学校计算物理研究会

吉林省物理学会

Abstract:

This work presents estimates of shear-wave velocity profiles for different types of sediments by inverting the dispersion curves of interface waves. Data used in this study were collected at different locations with different recording devices in different experiments. Four data sets were analyzed. Data from one set were recorded by hydrophone array, and data from other three sets were collected by multi-component ocean bottom seismic cables. The configuration of the experimental setup and the environmental conditions were different for the different experiments. Water depth varied from 2 m to 365 m. The frequency range of the interface-wave data was from 1.5 Hz to around 20 Hz. The phase-velocity dispersion curves of the interface waves were extracted using different time-frequency analysis methods. The maximum penetration depth of the interface waves to the sediments varied from 15m to 180 m. A Bayesian nonlinear inversion approach was used for estimating shear-wave velocity profiles as a function of depth in the sediments and the uncertainties. The estimated shear-wave velocity profiles from different experiment and different sediment type were discussed and compared.