Abstract
ABSTRACT Recent subaerial volcanism at El Hierro Island (Canary Islands, Spain) consists of monogenetic volcanic fields. This volcanism generated cinder cones, tephra air-fall deposits, and lava flows. The lava flows reach several kilometres in length extending through shore platforms and, sometimes, penetrating under the sea level. The volcanic landforms of El Hierro convert it into a natural laboratory for topographic and morphometric modelling and lava flow simulations. We perform the modelling and simulation of the Montaña de Aguarijo eruption, a cinder cone at the NE rift. The associated lava flow channelled through a V-shaped ravine until reaching a cliff, where formed cascades. The flow spread at the cliff base over a platform before reaching the sea modifying the coastline. Different maps were designed to show the results, including the geomorphologic reconstruction of the area affected by this eruption and the lava flow simulations obtained with the Q-LavHA plugin.
Highlights
Modelling and simulating volcanic lava flows help evaluate volcanic hazards associated with monogenetic basaltic eruptions and support safe strategies
We present Montaña de Aguarijo’s lava flow simulation running Lmax (Felpeto et al, 2001) and Lflowgo (Harris & Rowland, 2001) models
Field mapping and generation of 2D and 3D reconstructions allow calculating Montaña de Aguarijo morphometric parameters used as input data to simulate the lava flow inundation probability
Summary
Modelling and simulating volcanic lava flows help evaluate volcanic hazards associated with monogenetic basaltic eruptions and support safe strategies. While some maps are based on qualitative analysis of historical eruptions, modern assessment combines the geological history with probabilistic or deterministic computational models Preand post-eruptive DEMs are the product of an accurate 3D palaeogeomorphological reconstruction of landforms before and after the studied eruptive event, based on fieldwork. In both cases, the tridimensional reconstruction of palaeosurface follows the methodology of Rodriguez-Gonzalez et al (2010), aiming to be closer to reality than previous formulae-derived methods
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