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Active normal fault control on landscape and rock-slope failure in Northern Norway

P. T. Osmundsen, I. Henderson, T. R. Lauknes, Y. Larsen, T. F. Redfield and J. Dehls
Active normal fault control on landscape and rock-slope failure in Northern Norway
Geology (Boulder) (February 2009) 37 (2): 135-138


Structural, geomorphic, and interferometric synthetic aperture radar (InSAR) surface displacement data show that uplift of the northernmost onshore Scandinavian passive margin is associated with active normal faulting and anomalous clusters of landslides. Regional-scale normal faults separate alpine footwall ranges with impressive range-front scarps from more gentle hanging-wall topography. In the Lyngen region, rockslides, sackung features (i.e., deep-seated slope gravitational deformation), and active faults cluster inside an approximately 1000 km (super 2) area of hanging-wall subsidence parallel to an approximately 30-km-long, faceted range-front scarp. From postglacial to recent time, rockslides have been released along the main range front and other propagating scarps, both in the footwall range and in structurally controlled, glacially oversteepened valleys of the hanging wall. The active rockslides, moving at rates of >10 mm/yr, show a variety of relationships to the controlling structures, reflecting tectonic as well as gravitational faulting. Recent and present-day landscape evolution and large-volume rockslide distribution in Scandinavia should be viewed from the perspective of tectonic processes involving active normal faults.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 37
Serial Issue: 2
Title: Active normal fault control on landscape and rock-slope failure in Northern Norway
Affiliation: Geological Survey of Norway, Trondheim, Norway
Pages: 135-138
Published: 200902
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 2009-031182
Categories: Structural geologyGeomorphology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2009037
Illustration Description: illus. incl. sect., sketch map
N69°19'60" - N69°58'00", E19°30'00" - E20°30'00"
Secondary Affiliation: Norut, NOR, Norway
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200917
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