Summary
Origin ofP waves detected earlier in microseisms of very quiet locations in the USSR is discussed in detail. It appears that the most pronounced sources ofP waves are tropical cyclones over the Pacific. The amplitude of the force in the source for a medium power typhoon is found to be of the order of 1016 dynes. The effective source area is estimated as 104–105 km2 approximately. The shape of the amplitude spectrum ofP wave corrected for the absorption in the mantle does not contradict with the standing wave theory of microseisms generation. Results of observations at various epicentral distances give strong evidences of the predominant attenuation of the fundamental Rayleigh mode as compared with higher Rayleigh modes andP waves in the frequency band of 0.3–0.15 cps.
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References
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Vinnik, L.P. Sources of microseismicP waves. PAGEOPH 103, 282–289 (1973). https://doi.org/10.1007/BF00876404
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DOI: https://doi.org/10.1007/BF00876404