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Three recent larger earthquakes offshore Norway
Author(s) -
Hansen Roger A.,
Bungum Hilmar,
Alsaker Alfred
Publication year - 1989
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.1989.tb00371.x
Subject(s) - intraplate earthquake , geology , seismology , submarine pipeline , focal mechanism , magnitude (astronomy) , tectonics , fault (geology) , thrust fault , oceanography , physics , astronomy
Three earthquakes of magnitude around 5 occurred offshore western Norway on 5th February, 1986, on 8th August, 1988, and on 23rd January, 1989. These earthquakes, representing the highest seismic activity level in this area for at least 30 years, were all felt by people over most of southern and central Norway. Focal‐mechanism solutions for these earthquakes indicate thrust faulting along N‐S to NNE‐SSW striking fault planes, in response to NW‐SE compressional stress, most probably of plate tectonic origin. A number of high‐quality digital recordings of the ground motions at various distances from these and other recent earthquakes in Norway have shown that source spectral as well as wave attenuation characteristics in this area are reasonably consistent with what has been derived from other intraplate areas.