Large landslide in Fagraskógarfjall, west Iceland

Sentinel-2 MSI acquired on 20 June 2018 at 13:17:19 UTC
Sentinel-1 CSAR IW acquired on 05 July 2018 at 18:58:57 UTC
Sentinel-2 MSI acquired on 17 July 2018 at 13:12:59 UTC
Sentinel-1 CSAR IW acquired on 17 July 2018 at 18:58:58 UTC
Author(s): Sentinel Vision team, VisioTerra, France - svp@visioterra.fr
Keyword(s): Land, geohazard, landslide, mountain, dam, river, Iceland
Fig. 1 - S1 (05.07.2018) - vv,vh,vv colour composite - July 7th, a landslide fell in Fagraskógarfjall mountain in Hítardalur valley, west-Iceland.
2D view
Fig. 2 - 17.07.2018 - The dejection cone of the large landslide clearly shows in bright, the new lake & diverted river in dark.
2D view
The landslide crossed the river Hítará, damming the river and causing a lake to form above the debris tongue.
Fig. 3 - ndi(vv after,vv before),ndi(vh after,vh before),ndi(vv after,vv before) colour composite - Bright & dark show change.
2D animation 2D view
This composite using normalised difference indices between several dates highlights the debris fan in bright. Just north, the dammed river formed a lake (dark) which water now flows south east toward the Tálmi river bed (lesser dark ribbon). Downstream of the landslide, river Hítará is partly dried up which shows as a bright ribbon.
Fig. 4 - S2 (20.06.2018) - 4,3,2 natural colour - The total slide volume might be 10–20 million m3, up to 20–30 m thick on 1.8km².
3D view 2D view
Fig. 5 - 17.07.2017 - Same optical view 10 days after the landslide.
3D animation 3D view 2D view
The water found a new channel east the next day into Tálmi, a riverbed that reconnects with the now smaller Hítará river a few km farther downstream.
The views expressed herein can in no way be taken to reflect the official opinion of the European Space Agency or the European Union.
Contains modified Copernicus Sentinel data 2024, processed by VisioTerra.
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