Rayleigh phase velocities in Southern California from beamforming short-duration ambient noise
Rayleigh phase velocities in Southern California from beamforming short-duration ambient noise
复制标题
南加州波束成形短时环境噪声的瑞利相速度
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Y. Ben‐Zion
中科院分区：
文献类型：
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作者：
P. Roux;Y. Ben‐Zion
S U M M A R Y区域地震仪阵列记录的环境噪声的波束形成被提出作为传感器对之间互相关的替代成像方法。用该方法计算了加州南部第一、二脉动峰附近的瑞利面波相速度和传播方向。导出的速度图和传播方向与该地区的主要地质结构和海岸形状的变化相关。结果是一致的，并补充那些使用传感器对之间的长时间数据的互相关。所提出的高分辨率自适应波束形成方法在点对点噪声互相关上的显著优点是所需数据的时间间隔短（与一年相比为几小时到几天）和具有定向（而不是全向）噪声传播的鲁棒性能。考虑到最近的趋势，密集和大型地震阵列在各种规模，波束形成和噪声相关处理的组合可以提供一个最佳的策略，执行基于噪声的层析成像。
S U M M A R Y Beamforming of ambient noise recorded by regional arrays of seismometers is presented as an alternative imaging approach to cross-correlations between pairs of sensors. The method is used to obtain phase velocities and propagation directions of Rayleigh surface waves around the first and second microseism peaks in southern California. The derived velocity maps and propagation directions correlate with major geological structures and changes of the coastal shape in the region. The results are consistent with and complementary to those obtained using cross-correlations of long-duration data between pairs of sensors. Significant advantages of the presented high-resolution adaptive beamforming method over point-to-point noise crosscorrelations are the short time interval of required data (hours to days compared to a year) and robust performance with directive (rather than omnidirectional) noise propagation. Given the recent trend toward dense and large seismic arrays at various scales, the combination of beamforming and noise-correlation processing may provide an optimal strategy for performing noise-based tomography.
基于零滞后交叉相关振幅场的焦斑成像：在圣哈辛托断层带密集阵列数据中的应用
DOI：
10.1002/2016jb013014
发表时间：
2016
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
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作者：
Hillers, G.;Roux, P.;Campillo, M.;Ben‐Zion, Y.
通讯作者：
Ben‐Zion, Y.