Okjökull
| Okjökull | |
|---|---|
Okjökull in September 2003. Photo: Oddur Sigurðsson | |
| Type | Glacier |
| Location | Iceland |
| Coordinates | 64°35′53″N 20°52′52″W / 64.598°N 20.881°W |
| Thickness | less than 50 m (160 ft): 35 |
| Status | Former glacier |
Okjökull (Icelandic pronunciation: [ˈɔkˌjœːkʏtl̥], Ok glacier) was a glacier in western Iceland on top of the shield volcano Ok.
Ok is located north-east of Reykjavík. The glacier was declared dead in 2014 by glaciologist Oddur Sigurðsson due to its loss of thickness. Ice crystals in glaciers collapse under their own weight to form solid ice capable of movement due to central gravitational pressure only when the ice is around forty to fifty metres thick.: 35, 42 By 2017 its thickness no longer met this criterion and was less than the 2015 area of 0.7 km2 (0.27 sq mi) which in turn was much less than its 15 km2 (5.8 sq mi) size at the start of the twentieth century.: 35