Estimation of shear-velocity profiles using shear source data in marine environment
Estimation of shear-velocity profiles using shear source data in marine environment
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DOI：
10.1121/1.4708258
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发表时间：
2012-04
影响因子：
2.4
通讯作者：
Hefeng Dong;Thanh-Duong Nguyen;K. Duffaut
中科院分区：
文献类型：
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作者：
Hefeng Dong;Thanh-Duong Nguyen;K. Duffaut
本文利用从剪切源产生的数据中提取的界面波频散曲线来估计海底剪切速度剖面及其不确定性。这些数据是在北海剪切源测试实验中用4C海底电缆采集的。剪切震源在2至60赫兹的频率范围内产生地震信号，并在线内和跨线方向上都被极化。记录到低频Scholte波和Love波。用不同的时频分析方法提取了基模和高阶模式的Scholte波和Love波的频散曲线。垂直(SV)和水平(SH)极化剪切速度剖面分别由Scholte波和Love波频散曲线估计。采用贝叶斯方法进行反演。采用差分进化全局搜索算法估计最可能的剪切速度模型。边际后验概率分布由Metropolis-Hastings抽样计算。
This paper estimates seabed shear-velocity profiles and their uncertainties using interface-wave dispersion curves extracted from data generated by a shear source. The data were collected by 4C ocean bottom cable in a testing experiment of a shear source in the North Sea. The shear source generated a seismic signature over a frequency range between 2 and 60 Hz and was polarized in both in-line and cross-line orientation. Low-frequency Scholte- and Love-wave were recorded. Dispersion curves of the Scholte- and Love-wave for the fundamental mode and higher-order modes are extracted by different time-frequency analysis method. Both vertical (SV) and horizontal (SH) polarized shear-velocity profiles are estimated by Scholte- and Love-wave dispersion curves, respectively. Bayesian approach is used for the inversion. Differential evolution (DE) global search algorithm is applied to estimate the most-probable shear-velocity models. Marginal posterior probability profiles are computed by Metropolis-Hastings sampl...