资源环境科技发展态势分析平台

Using continuous data from a dense seismic array in Southwestern China, we tracked S-wave microseism sources generated by two storms in Southeast Australia and the North Atlantic. In the frequency band 0.1-0.2 Hz, the beam strengths for SV- and SH-wave sources can reach 29% and 18% of P-wave, respectively. We found that the strong SH-wave is only observed when the seismic sources are near the thick sedimentary regions whereas P- and SV-wave is irrespective of that. It appears that in addition to a three-dimensional structure that is needed for conversion from P-wave to SH-wave, amplitude enhancement by a sedimentary layer is essential for the detection of SH-wave.