Abstract
Comment on “Dynamics of the Askja caldera July 2014 landslide, Iceland, from seismic signal analysis: precursor, motion and aftermath” by Schöpa et al. (2018)
Highlights
Our estimate for the volume of material mobilized by the rockslide is based on a reconstruction of the geometry of the sliding plane from the available field evidence
If the horizontal displacement of the centre of mass of the mobilized material was as great as estimated by Schöpa et al (2018), most of the debris mass that terminated on land must have moved from the starting area down to the run-out zone near the shore of the lake, which has an area of ∼ 330 000 m2
The volume and centre-of-mass displacement estimated by Schöpa et al (2018) correspond to an average debris thickness of 75–210 m in this part of the run-out zone of rockslide on land. This thickness is difficult to reconcile with the available field measurements, in particular the thickness values near the higher end of this range
Summary
Our estimate for the volume of material mobilized by the rockslide is based on a reconstruction of the geometry of the sliding plane from the available field evidence. If the horizontal displacement of the centre of mass of the mobilized material was as great as estimated by Schöpa et al (2018), most of the debris mass that terminated on land must have moved from the starting area down to the run-out zone near the shore of the lake, which has an area of ∼ 330 000 m2.
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