Long-period microseisms at Umeå, Sweden

Details Long-period microseisms at Umeå, Sweden Long-period microseisms at Umeå, Sweden

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pepi...63..232b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 63, Issue 3-4, p. 232-233.

Physics

Scientific paper

Microseisms in the period range 14-20 s recorded by the long-period Press-Ewing seismographs at Umeå (63°48.9'N, 20°14.2'E) are investigated with special regard to their properties and their origin. In the 11-year period (1964-1974) under investigation, 28 clear long-period microseismic storms were detected by visual inspection of Umeå records. With an annual average of 2-3 cases, these represent the best developed storms. However, it is very likely that additional weaker storms could be detected by higher instrument magnification in the long-period range or by record filtering.
Among the stations in our seismograph network, Uppsala and Kiruna also operate long-period seismographs, but they are of lower magnification than at Umeå. In fact, it is too low to permit visual detection of long-period microseismic storms, except very rarely at Uppsala.

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