Is gravitational spreading a precursor for the Stífluhólar landslide (Skagafjörður, Northern Iceland)?
Julien Coquin
(1)
,
Denis Mercier
(2)
,
Olivier Bourgeois
(3)
,
Thierry Feuillet
(4)
,
Armelle Decaulne
(1)
Julien Coquin
- Fonction : Auteur
- PersonId : 7560
- IdHAL : julien-coquin
- IdRef : 192425641
Denis Mercier
- Fonction : Auteur
- PersonId : 8684
- IdHAL : dmercier
- ORCID : 0000-0003-2325-1390
- IdRef : 059339322
Olivier Bourgeois
- Fonction : Auteur
- PersonId : 183089
- IdHAL : olivier-bourgeois
- ORCID : 0000-0003-2781-6539
- IdRef : 131264419
Thierry Feuillet
- Fonction : Auteur
- PersonId : 744616
- IdHAL : thierry-feuillet
- ORCID : 0000-0002-5494-538X
- IdRef : 153040610
Armelle Decaulne
- Fonction : Auteur
- PersonId : 179996
- IdHAL : armelle-decaulne
- ORCID : 0000-0002-8029-850X
Résumé
In Iceland, the Late Weichselian deglaciation led to paraglacial topographic readjustments in the form of extensive
deep-seated gravitational slope deformation (DSGSD) and large rockslope failures (landslides and rock-avalanches).
Here we provide age estimates for the Stí" uhólar landslide (Tröllaskagi Peninsula, Northern Central Iceland),
which indicate that this occurred between the end of the Late Weichselian deglaciation (15-13 ka cal. yr. BP) and
8200 ± 1400 cal. yr. BP. Our surface observations also suggest that the Stífluhólar landslide was probably initiated
by propagation and connection of DSGSD failure planes. This observation suggests that the DSGSD can act as a
precursor for landsliding in paraglacial settings. However, further investigations are still required to fully assess the
role of DSGSD as a landslide precursor, both at the local and at a regional scale. Comparisons with other examples
of paraglacial rock slope failures in Northern Iceland and in the world suggest that DSGSD is not the main or
suficient precondition for large landslides. The landslide of Stífluhólar occurred due to some combination of
favorable preconditioning, predisposing and triggering controls. Predisposing controls include: the favourable dip
of the bedding planes in the basaltic bedrock and the presence of intercalated poorly cohesive layers of palagonite
between the lava layers, probably acting as basal sliding planes for the landslide.
Domaines
GéographieFormat du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Is gravitational spreading a precursor for the Stífluhólar landslide (Skagafjörður, Northern Iceland)?
|
Résumé |
en
In Iceland, the Late Weichselian deglaciation led to paraglacial topographic readjustments in the form of extensive
deep-seated gravitational slope deformation (DSGSD) and large rockslope failures (landslides and rock-avalanches).
Here we provide age estimates for the Stí" uhólar landslide (Tröllaskagi Peninsula, Northern Central Iceland),
which indicate that this occurred between the end of the Late Weichselian deglaciation (15-13 ka cal. yr. BP) and
8200 ± 1400 cal. yr. BP. Our surface observations also suggest that the Stífluhólar landslide was probably initiated
by propagation and connection of DSGSD failure planes. This observation suggests that the DSGSD can act as a
precursor for landsliding in paraglacial settings. However, further investigations are still required to fully assess the
role of DSGSD as a landslide precursor, both at the local and at a regional scale. Comparisons with other examples
of paraglacial rock slope failures in Northern Iceland and in the world suggest that DSGSD is not the main or
suficient precondition for large landslides. The landslide of Stífluhólar occurred due to some combination of
favorable preconditioning, predisposing and triggering controls. Predisposing controls include: the favourable dip
of the bedding planes in the basaltic bedrock and the presence of intercalated poorly cohesive layers of palagonite
between the lava layers, probably acting as basal sliding planes for the landslide.
|
Auteur(s) |
Julien Coquin
1
, Denis Mercier
2
, Olivier Bourgeois
3
, Thierry Feuillet
4
, Armelle Decaulne
1
1
LETG - Nantes -
Littoral, Environnement, Télédétection, Géomatique
( 2267 )
- Institut de Géographie et d'Aménagement de l'Université de Nantes Campus du Tertre BP 8122
44312 NANTES CEDEX 3
- France
2
ENeC -
Espaces, Nature et Culture
( 224523 )
- Laboratoire Espaces, Nature et Culture (ENeC)
UMR CNRS-Paris IV 8185
Maison de la Recherche
28 rue Serpente
75006 Paris
- France
3
LPG -
Laboratoire de Planétologie et Géodynamique [UMR 6112]
( 830 )
- 2 Rue de la Houssinière - BP 92208 44322 NANTES CEDEX 3
- France
4
LADYSS -
Laboratoire Dynamiques Sociales et Recomposition des Espaces
( 1096 )
- Université Paris Ouest Nanterre La Défense Bâtiment T 200 avenue de la République 92001 Nanterre cedex
- France
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2016
|
Volume |
22
|
Numéro |
1
|
Page/Identifiant |
9-24
|
Domaine(s) |
|
Mots-clés |
en
Geomorphology, Iceland, Landslide, Holocene, Paraglacial
|
DOI | 10.4000/geomorphologie.11295 |
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