The numbers of major UFO reports per 6-mo. increment and the numbers of earthquakes per 6-mo. increment within Sweden were calculated for the years 1963 through 1977. Symmetrical lag/lead multiple regression analyses gave a positive intermediate strength correlation (0.59) between the numbers of earthquakes per increment and the numbers of UFO reports (UFORs) during the previous increment only. These results are similar to UFOR-seismic temporal relationships that have been found in the central USA, Utah, Washington State, and Manitoba. These patterns strongly suggest a general relationship between reports of luminous phenomena, frequently labelled as UFOs, and consequent seismic activity.
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