| Illorsuit | |
| Pushpin Map: | Greenland |
| Pushpin Map Caption: | Location within Greenland |
| Pushpin Mapsize: | 300 |
| Subdivision Type: | Sovereign state |
| Subdivision Type1: | Autonomous country |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Avannaata |
| Population As Of: | 2020 |
| Population Total: | 0 |
| Timezone: | UTC-03 |
| Coordinates: | 71.2417°N -53.5667°W |
| Postal Code Type: | Postal code |
| Postal Code: | 3961 Uummannaq |
Illorsuit (in Kalaallisut; Greenlandic pronounced as /iɬːɔsːuit/; old spelling: Igdlorssuit) is a former settlement in Avannaata municipality, in western Greenland. Located on the northeastern shore of Illorsuit Island − northwest of Uummannaq at the mouth of the Uummannaq Fjord − the settlement had 91 inhabitants in 2010.[1] It was abandoned in 2018.
On 17 June 2017, a landslide measuring 300x fell about 1000sigfig=3NaNsigfig=3 into Karrat Fjord, generating a megatsunami that hit Nuugaatsiaq.[2] [3] [4]
Initially it was unclear if the landslide was caused by a small earthquake (magnitude 4),[5] but later it was confirmed that the landslide had caused the tremors. The tsunami had an initial height of 90to, but it was significantly lower once it hit Nuugaatsiaq, where it had a run-up height of .
Four people were killed and nine were injured at Nuugaatsiaq, and eleven buildings were washed into the water.[6] Illorsuit also suffered tsunami damage.[7] An evacuation of 170 residents of Illorsuit and Nuugaatsiaq followed because of a danger of additional landslides and waves.[8]
Illorsuit was abandoned in 2018, and as of March 2023, both llorsuit and Nuugaatsiaq remained uninhabited due to the continuing threat of landslide-generated tsunamis.[9]
See main article: article and Illorsuit Heliport. Prior to Illorsuit′s abandonment, Air Greenland served the village as part of government contract, with mostly cargo helicopter flights from Illorsuit Heliport to Nuugaatsiaq and Uummannaq.[10]
Before Illorsuit's abandonment, its population had dropped by 28 percent relative to the 1990 levels and by nearly 17 percent relative to the 2000 levels, reflecting a general trend in the region.[1]