Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...73..282d&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 73, Issue 3-4, p. 282-289.
Physics
2
Scientific paper
Microseisms, recorded at many stations in eastern Europe during October 1983, could be associated with storms off the coast of Norway. It is the object of the present investigation to ascertain how these microseisms could be formed. From the wind data, the three-dimensional wave spectra were hindcasted. These showed no evidence of waves travelling in opposite directions over this area and so any such effect must be due to reflection off the coast. The energies of the wave components within 22.5° to the normal to the mean coastline were evaluated from the hindcast spectra; their variation showed a good correspondence with both the double period and the amplitude of the observed microseisms. The bottom topography of the Norwegian coast was investigated and although the actual coastline is very indented, the neighbouring shelf contours are much more regular and show a very steep gradient. It is possible to calculate the reflection coefficients due to the depth variation offshore and these proved to be quite appreciable, being of the order of 20%. With values of this order there is no difficulty in explaining how microseisms of the observed magnitude could be caused.
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