Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3420304g&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 20, CiteID L20304
Physics
23
Seismology: Body Waves, Seismology: Theory, Seismology: General Or Miscellaneous, Oceanography: Physical: Surface Waves And Tides (1222)
Scientific paper
Microseisms are due to continuous harmonic forcing by ocean waves, whose sources vary in time, frequency, and azimuth. Using frequency-domain array beamforming, this variation is studied using one-year of continuous seismic data from 155 stations in southern California. Detailed analysis of data delineates spatiotemporal variations of sources for the primary and secondary microseisms. Both types of microseisms are generated near the coasts but the locations of excitation are different and change with season. Often sources are multiply located but can be spread out over wider areas, especially in the case of secondary microseisms. Distant storms can also be seen occasionally in the frequency range between the primary and secondary microseisms where spectral amplitudes from nearby sources are low.
Gerstoft Peter
Tanimoto Toshiro
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