Abstract
Seismic activity in four different catalogs is examined for periodicity, both in terms of yearly energy release and number of earthquakes per year. The four catalogs examined cover different areas in different time windows: the Mohns Ridge (a segment of the northern Mid-Atlantic Ridge) (1960–1988), earthquakes felt in Norway (1891–1989), earthquakes offshore Western Norway (1980–1989) and finally seismic energy release from global earthquakes with magnitudes greater then or equal to 7.9 for the years 1898–1977. A period of around 10 years is found in all catalogs and there is a clear correlation between seismicity felt in Norway and global seismic energy release. The correlation in the periodicities of the seismic activity found in these catalogs indicates a global cause for changes in seismicity.
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