Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pepi...63..181d&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 63, Issue 3-4, p. 181-195.
Physics
4
Scientific paper
In this paper an attempt is made to establish a quantitative relationship between the spectra of secondary microseisms recorded at Menai Bridge and the parent sea-wave spectra in the sea areas in the western approaches. Secondary microseisms have double the frequency of the parent waves. The sea-wave spectra were obtained from a hindcasting model. The problem was simplified by restricting the consideration of the microseismic energy to that associated with periods of 7 s or over and relating this to the energy spectra of sea waves of period 14 s or over. In this way only the strongest storms (usually only found in the North Atlantic) were taken into account. The hindcasting model gives a complete frequency-directional distribution of the sea-wave energy and so in coastal areas the energy moving normal to the coast can be ascertained. In the event, a workable relationship was found between the microseism spectra and those for waves in the Bristol Channel area and also the area bounded by the north coast of Ireland and the south-west coast of Scotland, including the North Channel. From the theory due to Longuet-Higgins it was possible to calculate the coastal reflection coefficients from the relationship by putting in the areas for these two regions. These were found to be between 0.15 and 0.25, which are too high for these coastal regions. It is probable therefore that these two regions act as monitors for larger sea areas.
An investigation was also made into the existence of primary microseisms (these have the same frequency as the parent waves). The results confirmed a previous finding that, with the vertical component, the energy is about 100 times less than that of the secondary.
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