Abstract
Ocean waves have long been recognized as the source of sound in the ocean in the frequency band from 0.05 to 5 Hz. Ocean surface waves from nearly opposing directions interact to excite an elastic wave of much greater phase velocity. Necessarily, the climatology of microseisms is directly related to the climatology of ocean waves. However, the microseism energy propagates as free modes (Rayleigh waves) of the elastic wave waveguide set up by the seafloor and the steep gradient in elastic wave velocities below the seafloor. The propagation of elastic waves within the waveguide is frequency and model dependent. The modes propagate great distances which act to average the ocean wave climate over a large area. The size of this area is frequency dependent and is determined by the e-folding distance associated with attenuation of Rayleigh waves across the ocean. Data from arrays of seismic and pressure instruments in both the Atlantic and the Pacific will be compared to modeling results. The goal is to predict microseism climatology from ocean wave climatology. [Work supported by ONR.]
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