Modeling lava flow propagation over a flat landscape by using MrLavaLoba: the case of the 2014–2015 eruption at Holuhraun, Iceland

Simone Tarquini, Mattia de' Michieli Vitturi, Esther Jensen, Gro Pedersen, Sara Barsotti, Diego Coppola, Melissa Anne Pfeffer

Abstract


During the emplacement of the 2014-2015 lava flow in Holuhraun (Iceland) a new

code for the simulation of lava flows (MrLavaLoba) was developed and tested. MrLavaLoba is a probabilistic code which derives the area likely to be inundated and the thickness of the final lava deposit. The flow field in Holuhraun progressed through a fairly flat floodplain, and the initial limited availability of topographic data was challenging, forcing us to develop specific modeling strategies. The development of the code, as well as simulation tests, continued after the end of the eruption, and latest results largely benefitted from the availability of improved topographic data. MrLavaLoba simulations of the Holuhraun scenario are compared with detailed observational analyses derived from the literature. The obtained results highlight that small-scale morphological features in the pre-emplacement topography can strongly influence the propagation of the flow. The distribution of the volume settling throughout the extension of the flow field turned out to be very important, and strongly affects the fit between the simulated and the real extent of the flow field. The performed analysis suggests that an improvement in the code should allow adaptable calibration during the course of the eruption in order to mimic different emplacement styles in different phases.

 


Keywords


lava flows; lava flow simulation; lava flow emplacement; Holuhraun; Iceland

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References


DOI: https://doi.org/10.4401/ag-7812

Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X