Pseudo-linear-array analysis of passive surface waves based on beamforming

Linear arrays are usually deployed for passive surface-wave investigations because of their high efficiency and convenience. However, the limited azimuthal coverage lacks the ability to attenuate velocity overestimation caused by directional noise sources. Liu et al. (2020) propose to add two more offline receivers to a conventional linear array for compensating the azimuthal coverage and then the beamforming technique is used for capturing the source distribution and estimating accurate dispersion measurements. Results from field data demonstrate the feasibility of the proposed method to measure unbiased dispersion image.

 Figure 1. Dispersion curves of the five methods extracted from dispersion images.

This work has been done by Prof. Jianghai Xia’s group and published in Geophysical Journal International (a ZJUTOP journal). The first author Ya Liu is a PhD student. This study is supported by the National Natural Science Foundation of China under grant no. 41830103.

For more details:

 Liu, Y., J. Xia, F. Cheng, C. Xi, C. Shen, and C. Zhou, 2020, Pseudo-linear-array analysis of passive surface waves based on beamforming: Geophysical Journal International, 221, 640–650, doi:10.1093/gji/ggaa024.