Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..121..325r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 121, Issue 3-4, p. 325-338.
Physics
7
Scientific paper
It is well established that the Earth oscillates continuously with its fundamental modes excited even on seismically quiet days but the source of this `background' excitation is unclear. The source could be internal (for example, tectonic motions) or external (for example, atmospheric turbulence). The GEOSCOPE broad-band seismic network provides a long-term, high quality, seismic data set to better observe these oscillations. Nine years of data from the quietest GEOSCOPE station (WUS) show background oscillations as well as evidence of a small annual variation with the most energy in June and July. We also use 4 years of simultaneous pressure/seismometer data from the TAM station to show how to improve the resolution of these oscillations by subtracting the pressure effect on the acceleration signal. Removing the pressure effect allows us to isolate some very low frequency spheroidal fundamental modes as low as angular order /l=2 after large earthquakes and down to /l=8 during quiet periods.
Crawford Wayne
Roult Geneviève
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