Sam Poppe

Q-LAVHA

Q-LavHA is a freeware plugin which simulates lava flow inundation probability from one or regularly distributed eruptive vents on a Digital Elevation Model (DEM). It combines existing probabilistic and deterministic models and proposes some improvements to calculate the probability of lava flow spatial propagation and terminal length. Spatial propagation is constrained by the probabilistic steepest slope. Corrective factors are included to allow the flow simulation to overcome small topographical obstacles and to fill pits. The terminal length of the flow simulation can be determined based on a fixed length value, a statistical length probability function or based on the thermo-rheological properties of an open-channel lava flow. The impact of model parameters, background slope and DEM resolution on the accuracy of the simulations are discussed. The user-friendly interface and the flexibility of Q-LavHA makes it a tool applicable from long-term volcanic hazard assessment to short-term hazard forecasting. Free, user-friendly plugin to simulate lava flow inundation probability.Q-LavHA flexibility allows to adapt to a large range of situations.Q-LavHA applicability is tested on Nyamuragira (DRC) and Etna (Italy) volcanoes.Simulates the emplacement of lava in a realistic way from different source types.

Destroying a Volcanic Edifice—Interactions Between Edifice Instabilities and the Volcanic Plumbing System

Abstract Volcanic edifices can collapse during their lifetime, often more than once. Volcano collapses have been documented worldwide in various tectonic settings. They can affect small and large edifices and active or non-active volcanoes. Long- or short-term instabilities develop within or below the edifice, deform its shape and a sudden trigger might prompt volcano failure, resulting in a volcanic landslide. The volume portion of the edifice involved in the collapse can vary from ∼0.1 to 10 km 3 and depends on the size of the edifice and the location of the failure plane. A shallow-seated failure plane will likely not affect the volcanic plumbing system, while a deep-seated failure plane may impact the structure and the orientation of the volcanic and igneous plumbing system and can influence the post-collapse volcanic activity and type of erupted magma. This then influences how an active edifice can rebuild itself.