Inversion of First-arrival Time Using Simulated Annealing
Inversion of First-arrival Time Using Simulated Annealing
复制标题
使用模拟退火反演首次到达时间
DOI：
10.2113/jeeg16.1.25
复制
发表时间：
2011
影响因子：
1
通讯作者：
D. Hiltunen
中科院分区：
文献类型：
--
作者：
K. Tran;D. Hiltunen
提出了一种利用模拟退火法反演首次到达时间的方法。该方案基于Eikonal方程的极快有限差分解，通过多模板快速推进法的速度模型计算初到时间。模拟退火的核心是Metropolis采样器，该采样器与镜头级联，以显着减少计算机时间。此外，模拟退火提供了一套围绕全局解决方案聚类的最终模型，并具有可比的最小二乘误差，以允许确定与反演结果相关的不确定性。用合成数据集和真实数据集对该反演技术的性能进行了测试。反演结果表明，该方法成功地绘制了变化较大的二维速度剖面。实际数据的反波速似乎与锥贯入试验（CPT）、岩土钻孔和标准贯入试验（SPT）的结果一致。
A technique is presented to invert first-arrival time using simulated annealing. The scheme is based on an extremely fast finite-difference solution of the Eikonal equation to compute the first-arrival time through the velocity models by the multistencils fast marching method. The core of the simulated annealing, the Metropolis sampler, is applied in cascade with respect to shots to significantly reduce computer time. In addition, simulated annealing provides a suite of final models clustering around the global solution and having comparable least-squared error to allow determining uncertainties associated with inversion results. The capability of this inversion technique is tested with both synthetic and real experimental data sets. The inversion results show that this technique successfully maps 2-D velocity profiles with high variation. The inverted wave velocity from the real data appears to be consistent with cone penetration test (CPT), geotechnical borings, and standard penetration test (SPT) results.