Are deep-ocean-generated surface-wave microseisms observed on land?
Bromirski, Peter D.
Stephen, Ralph A.
MetadataShow full item record
KeywordDouble-frequency microseisms; Deep-ocean wave interactions; Pseudo-Rayleigh waves; Near-coastal DF microseism generation; Beamforming; Time-domain finite-difference
Recent studies attribute land double-frequency (DF) microseism observations to deep water generation. Here we show that near-coastal generation is generally the dominant source region. This determination is based on observations at land and ocean seismic stations, buoys, gravity-wave hindcasts, and on beamforming results from continental seismic arrays. Interactions between opposing ocean wave components generate a pressure excitation pulse at twice the ocean wave frequency that excites pseudo-Rayleigh (pRg) wave DF microseisms. pRg generated in shallow coastal waters have most of their energy in the solid Earth (“elastic” pRg) and are observed by land-based and seafloor seismometers as DF microseisms. pRg generated in the deep ocean have most of their energy in the ocean (“acoustic” pRg) and are continuously observed on the ocean bottom, but acoustic pRg does not efficiently transition onto continents. High-amplitude DF signals over the [0.2, 0.3] Hz band observed on the deep seafloor are uncorrelated with continental observations and are not clearly detectable at individual continental stations or by land seismic-array beamforming. Below 0.2 Hz, modeling and some observations suggest that some deep water-generated elastic pRg energy can reach continental stations, providing that losses from scattering and transition across the continental-shelf boundary to the shore are not substantial. However, most observations indicate that generally little deep-ocean-generated DF microseism energy reaches continental stations. Effectively, DF land observations are dominated by near-coastal wave activity.
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 118 (2013): 3610–3629, doi:10.1002/jgrb.50268.
Showing items related by title, author, creator and subject.
Bromirski, Peter D.; Duennebier, Fred K.; Stephen, Ralph A. (American Geophysical Union, 2005-04-20)The Hawaii-2 Observatory (H2O) is an excellent site for studying the source regions and propagation of microseisms since it is located far from shorelines and shallow water. During Leg 200 of the Ocean Drilling Program, ...
Tyack, Peter L. (American Institute of Physics, 2009-11)Most species of large whales are endangered because for centuries whaling fleets have decimated their populations. In the late 1960s, marine-mammal biologists discovered that fishermen setting nets for tuna in the Pacific ...
MORB generation beneath the ultraslow spreading Southwest Indian Ridge (9–25°E) : major element chemistry and the importance of process versus source Standish, Jared J.; Dick, Henry J. B.; Michael, Peter J.; Melson, William G.; O'Hearn, Timothy (American Geophysical Union, 2008-05-15)We report highly variable mid-ocean ridge basalt (MORB) major element and water concentrations from a single 1050-km first-order spreading segment on the ultraslow spreading Southwest Indian Ridge, consisting of two ...