Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Babcock, J. M. Articles by Orcutt, J. A. Search for Related Content GeoRef GeoRef Citation

Relationships between ocean bottom noise and the environment

Institute of Geophysics and Planetary Physics Scripps Institution of Oceanography, La Jolla, California 92093-0225

Abstract

Observations of ocean bottom low-frequency noise and surface environmental data over a period of 27 days in the northern Atlantic during the SAMSON and SWADE experiments reveal how closely related the noise is to meteorological conditions. Double-frequency microseisms produced by nonlinear interactions of storm-induced surface gravity waves are especially evident in the frequency band 0.16 to 0.3 Hz and show a high variability in both amplitude and peak frequencies. Bifurcated at times, the peak that characterizes the microseism band contains local and distant or "teleseismic" components, which are generated at different locations. Weather and storm fetch appear to be the major contributions to the size and shape of microseism spectra. Storm development on the sea surface is associated with progressively lower microseism frequencies along with a concurrent increase in amplitude. The single-frequency microseism peak is a continuous feature and is observed to portray the same time-dependent spectral characteristics as the portion of the double-frequency peak associated with distant storms. Coherence studies confirm that both peaks (single and teleseismic double) originate at a distant source. These peaks are generated at roughly the same location with some storm component over the coastline.

This article has been cited by other articles:

				M. Vassallo, A. Bobbio, and G. Iannaccone A Comparison of Sea-Floor and On-Land Seismic Ambient Noise in the Campi Flegrei Caldera, Southern Italy Bulletin of the Seismological Society of America, December 1, 2008; 98(6): 2962 - 2974. [Abstract] [Full Text] [PDF]

				T. Dahm, F. Tilmann, and J. P. Morgan Seismic Broadband Ocean-Bottom Data and Noise Observed with Free-Fall Stations: Experiences from Long-Term Deployments in the North Atlantic and the Tyrrhenian Sea Bulletin of the Seismological Society of America, April 1, 2006; 96(2): 647 - 664. [Abstract] [Full Text] [PDF]

				W. S. D. Wilcock, S. C. Webb, and I. Th. Bjarnason The effect of local wind on seismic noise near 1 Hz at the MELT site and in iceland Bulletin of the Seismological Society of America, December 1, 1999; 89(6): 1543 - 1557. [Abstract] [PDF]

				D. K. Blackman, J. A. Orcutt, and D. W. Forsyth Recording teleseismic earthquakes using ocean-bottom seismographs at mid-ocean ridges Bulletin of the Seismological Society of America, December 1, 1995; 85(6): 1648 - 1664. [Abstract] [PDF]