Coupled seismoacoustic modes on the seafloor

Details Coupled seismoacoustic modes on the seafloor Coupled seismoacoustic modes on the seafloor

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..57b&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 10, pp. 57-1, CiteID 1418, DOI 10.1029/2002GL014722

Physics

3

Seismology: General Or Miscellaneous, Seismology: Theory And Modeling, Oceanography: General: Ocean Acoustics, Information Related To Geographic Region: Pacific Ocean

Scientific paper

Wave-to-wave coupling arises when an acoustic pulse selects a Rayleigh mode of the same speed and both travel together swapping energy across an interface [Ewing et al., 1957]. A distinctive signal is observed at the Hawaii-2 Observatory for purely oceanic paths from earthquakes on the Blanco and Mendocino Fracture Zones, off the coast of North America. The signal appears to be a composite of undispersed higher Rayleigh modes propagating along the ocean floor both in the sediments and in the water. The new coupled modes are identified by their frequency composition and their phase and group velocities. Seismoacoustic coupling at the seafloor is conditioned on (a) the presence of a low-velocity interface at the ocean floor, and (b) the wavelength of the Rayleigh component being shorter than the depth of the water layer.

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