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Tanimoto, Toshiro; Hadziioannou, Celine; Igel, Heiner; Wassermann, Joachim; Schreiber, Ulrich; Gebauer, Andre; Chow, Bryant (2016): Seasonal variations in the Rayleigh-to-Love wave ratio in the secondary microseism from colocated ring laser and seismograph. In: Journal of Geophysical Research-Solid Earth, Vol. 121, No. 4: pp. 2447-2459
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Abstract

Monthly variations in the ratio of Rayleigh-to-Love waves in the secondary microseism are obtained from a colocated ring laser and an STS-2 seismograph at Wettzell, Germany. Two main conclusions are derived for the Rayleigh-to-Love wave kinetic energy ratios in the secondary microseism;first, the energy ratio is in the range 0.8-0.9 ( 1.0) throughout a year except for June and July. It means that Love wave energy is larger than Rayleigh wave energy most of the year by about 10-20%. Second, this ratio suddenly increases to 1.0-1.2 in June and July, indicating a larger fraction of Rayleigh wave energy. This change suggests that the locations and behaviors of excitation sources are different in these months.