Osmussaar earthquake

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Osmussaar earthquake
Osmussaar earthquake is located in Estonia
Osmussaar earthquake
UTC time1976-10-25 08:39
ISC event707568
Local date25 October 1976
Local time11:39 MSK[1]
Magnitude4.5 mb [2]
Epicenter59°18′N 23°30′E / 59.3°N 23.5°E / 59.3; 23.5Coordinates: 59°18′N 23°30′E / 59.3°N 23.5°E / 59.3; 23.5

The Osmussaar earthquake occurred on 25 October 1976 near the north tip of Osmussaar, an island close to the coast of Estonia. Its hypocenter was 10–13 kilometres (6–8 mi) below ground level, and it was measured at 4.5–4.7 mb.[2][3][4] The earthquake was the most powerful recorded in Estonia;[5] it caused rockfall along the north and northeastern coasts,[4] and some houses took structural damage. The earthquake was largely felt in surrounding areas like north Estonia, south Finland and Sweden. Aftershocks also took place in November.


  1. ^ Nikonov, A. A.; Sildvee, H. "Historical Earthquakes in Estonia and Their Seismotectonic Position" (PDF). Geophysica. 27 (1–2): 79–93.
  2. ^ a b ANSS. "Estonia 1976". Comprehensive Catalog. U.S. Geological Survey.
  3. ^ GFZ - Potsdam. "SHARE European Earthquake Catalogue (SHEEC) 1900-2006". Retrieved 18 May 2020.
  4. ^ a b Estonian Academy of Science (December 2005). Proceedings of the Estonian Academy of Sciences, Geology. Estonian Academy Publishers.
  5. ^ Christian Koeberl; Francisca C. Martínez-Ruiz (7 April 2003). Impact Markers in the Stratigraphic Record. Springer Science & Business Media. pp. 345–. ISBN 978-3-540-00630-5.