Maskevarri Ráhppát in Finnmark, northern Norway – is it an earthquake-induced landform complex?

• Main Authors: R. Sutinen, I. Aro, P. Närhi, M. Piekkari, M. Middleton
• Format: Article
• Language: English
• Published: Copernicus Publications 2014-07-01
• Series: Solid Earth
• Online Access: http://www.solid-earth.net/5/683/2014/se-5-683-2014.pdf

The Sami word <i>ráhppát</i> means rough bouldery/stony terrain with sharp-relief topography in Finnmark, northern Norway. <i>Ráhppát</i> is a common name in the region of the Younger Dryas landforms, yet the origin of <i>ráhppát</i> has remained obscure. The timing of the Younger Dryas is concomitant with the maximum neotectonic fault instability in Fennoscandia. Hence, earthquake activity may have been one of the contributing factors for the Younger Dryas morphologies. <i>Ráhppát</i> on the Maskevarri fell, classified as a part of Tromsø-Lyngen sub-stage of the Younger Dryas, was studied by means of geomorphology and measurements of electrical-sedimentary anisotropy. <i>Ráhppát</i> was found to be built up of an anastomosing network of stony esker-like ridges and mounds bordered with arch-shaped and sinusoidal ridges. These bordering ridges exhibit sedimentary (azimuthal soil electrical conductivity) anisotropy parallel-to-ridge trends and were interconnected to meltwater gullies suggesting generation through short-lived conduit infills. We did not find electrical-sedimentary evidence to support the concept of englacial thrusting and/or compression, often described for Younger Dryas moraines. Maskevarri Ráhppát is typified by ~ 500 ponds and small lakes on three different elevations descending in an up-ice direction. These may have generated through late glacial earthquake(s) also contributing to subglacial deformation of Maskevarri Ráhppát.