Osmussaar earthquake

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 largely felt in surrounding areas like north Estonia, south Finland and Sweden. Aftershocks also took place in November.

Osmussaar earthquake

UTC time	1976-10-25 08:39
ISC event	707568
USGS-ANSS	ComCat
Local date	25 October 1976
Local time	11:39 MSK[1]
Magnitude	4.5 mb[2]
Depth	10–13 kilometres (6–8 mi)(GFZ)[3] 33 kilometres (21 mi)(USGS)[2]
Epicenter	59.157°N 23.725°E / 59.157; 23.725
Max. intensity	MMI V (Moderate)[2]

Damage

The earthquake was the most powerful recorded in Estonia;^[5] it caused rockfalls along the north and northeastern coasts,^[4] and some houses suffered some structural damage.^{[citation needed]}

See also

• Estonia portal

• List of earthquakes in 1976
• Geology of Estonia