Near-surface Scholte wave velocities at Ekofisk from short noise recordings by seismic noise gradiometry
Near-surface Scholte wave velocities at Ekofisk from short noise recordings by seismic noise gradiometry
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DOI：
10.1002/2015gl065027
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发表时间：
2015-09-16
影响因子：
5.2
通讯作者：
Biondi, B. L.
中科院分区：
文献类型：
--
作者：
de Ridder, S. A. L.;Biondi, B. L.
我们提出了一种使用周围地震场中存在的界面波的随机波场对地下进行成像的新方法。与地震干涉测量不同，我们的技术不依赖互相关来获得两个地震接收器之间的格林函数。相反，它依赖于直接从波场的二阶时间和空间导数之间的比率获得的相速度的局部测量。我们使用安装在 Ekofisk 上的大型密集阵列记录了 10 分钟的环境地震噪声记录。我们对近地表 Scholte 波相速度上沉降引起的地质力学印记进行了成像。通过与地震噪声互相关断层扫描的结果进行比较，验证了所得的相速度模式。
We propose a new approach for imaging the subsurface using a stochastic wavefield of interface waves present in the ambient seismic field. Unlike seismic interferometry, our technique does not rely on cross correlations to obtain the Green's function between two seismic receivers. Rather, it relies on the local measurements of phase velocity obtained directly from the ratio between second-order temporal and spatial derivatives of the wavefield. We process 10 min of ambient seismic noise recording made using a large and dense array installed over Ekofisk. We image a subsidence-induced geomechanical imprint on the Scholte wave phase velocities in the near surface. This resulting phase velocity pattern is verified by comparison to results from a seismic-noise cross-correlation tomography.