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Study of S ‐Wave Microseisms Generated by Storms in the Southeast Australia and North Atlantic
Author(s) -
Xiao Han,
Tanimoto Toshiro,
Xue Mei
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2021gl093728
Subject(s) - microseism , geology , storm , seismology , amplitude , sedimentary rock , surface wave , oceanography , paleontology , physics , optics
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.