Lava flow hazard modelling during the 2021 Fagradalsfjall eruption, Iceland: Applications of MrLavaLoba

On March 19, 2021, the first eruption in ca. 800 years took place in Fagradalsfjall on the Reykjanes Peninsula, in the backyard of the capital Reykjavík. This effusive eruption was the most visited eruption in Iceland to date and needed intense lava flow hazard assessment and became a test case for hazard assessment for future eruptions on the Peninsula, which can 15 issue lava into inhabited areas or inundate essential infrastructure. In this study we documented how lava flow modelling strategies were implemented using the stochastic code MrLavaLoba, evaluating hazards during the 6-month long effusive event. Overall, the purposes were three-fold; (a) Pre-eruption simulation to investigate potential infrastructure at danger for lava flow inundation (b) Syn-eruptive simulations for short-term (two weeks’ time frame) lava flow hazard assessment and (c) Syn-eruptive simulations for long-term hazard assessments (months 20 to years). Furthermore, strategies for lava barrier testing were developed and incorporation of near-real time syn-eruptive topographic models were implemented. During the crisis the code was updated to increase functionalites such as considering multiple active vents as well as code optimization that led to a substantial decrease in the computational time required for the simulations, speeding up the 25 delivery of final products.

[1]  B. Ófeigsson,et al.  The eruption in Fagradalsfjall (2021, Iceland): how the operational monitoring and the volcanic hazard assessment contributed to its safe access , 2023, Natural Hazards.

[2]  Rongjiang Wang,et al.  Cyclical geothermal unrest as a precursor to Iceland’s 2021 Fagradalsfjall eruption , 2022, Nature Geoscience.

[3]  A. Harris,et al.  Reappraisal of gap analysis for effusive crises at Piton de la Fournaise , 2022, Journal of Applied Volcanology.

[4]  E. Berthier,et al.  Volume, Effusion Rate, and Lava Transport During the 2021 Fagradalsfjall Eruption: Results From Near Real‐Time Photogrammetric Monitoring , 2021, Geophysical Research Letters.

[5]  F. Sigmundsson,et al.  The 2020 volcano-tectonic unrest at Reykjanes Peninsula, Iceland: stress triggering and reactivation of several volcanic systems , 2021 .

[6]  Mohamed S. Ebeida,et al.  Dakota A Multilevel Parallel Object-Oriented Framework for Design Optimization Parameter Estimation Uncertainty Quantification and Sensitivity Analysis: Version 6.12 User?s Manual. , 2020 .

[7]  S. Hreinsdóttir,et al.  The structure of seismogenic strike-slip faults in the eastern part of the Reykjanes Peninsula Oblique Rift, SW Iceland , 2020 .

[8]  Paolo Papale,et al.  Volcano observatory best practices (VOBP) workshops - a summary of findings and best-practice recommendations , 2019, Journal of Applied Volcanology.

[9]  E. Berthier,et al.  The geodetic mass balance of Eyjafjallajökull ice cap for 1945–2014: processing guidelines and relation to climate , 2019, Journal of Glaciology.

[10]  M. Ramsey,et al.  Validation of an integrated satellite-data-driven response to an effusive crisis: the April–May 2018 eruption of Piton de la Fournaise , 2019, Annals of Geophysics.

[11]  P. Okubo,et al.  The 2018 rift eruption and summit collapse of Kīlauea Volcano , 2019, Science.

[12]  D. Coppola,et al.  Modeling lava flow propagation over a flat landscape by using MrLavaLoba: the case of the 2014–2015 eruption at Holuhraun, Iceland , 2018, Annals of Geophysics.

[13]  Jérémie Labroquère,et al.  PyFLOWGO: An open-source platform for simulation of channelized lava thermo-rheological properties , 2018, Comput. Geosci..

[14]  A. Harris,et al.  Effusive crises at Piton de la Fournaise 2014–2015: a review of a multi-national response model , 2017, Journal of Applied Volcanology.

[15]  E. Rupnik,et al.  MicMac – a free, open-source solution for photogrammetry , 2017, Open Geospatial Data, Software and Standards.

[16]  E. Lev,et al.  Benchmarking computational fluid dynamics models of lava flow simulation for hazard assessment, forecasting, and risk management , 2017, Journal of Applied Volcanology.

[17]  Mathijs Saey,et al.  Q-LAVHA: A flexible GIS plugin to simulate lava flows , 2016, Comput. Geosci..

[18]  C. Del Negro,et al.  Lava flow hazard modeling during the 2014–2015 Fogo eruption, Cape Verde , 2015 .

[19]  G. Pedersen,et al.  Morphometry of subaerial shield volcanoes and glaciovolcanoes from Reykjanes Peninsula, Iceland: Effects of eruption environment , 2014 .

[20]  M. Favalli,et al.  Uncertainties in lava flow hazard maps derived from numerical simulations: the case study of Mount Etna , 2013 .

[21]  S. Baloga,et al.  Simulation of inflated pahoehoe lava flows , 2013 .

[22]  M. Pierrot Deseilligny,et al.  APERO, AN OPEN SOURCE BUNDLE ADJUSMENT SOFTWARE FOR AUTOMATIC CALIBRATION AND ORIENTATION OF SET OF IMAGES , 2012 .

[23]  C. Negro,et al.  An emergent strategy for volcano hazard assessment: From thermal satellite monitoring to lava flow modeling , 2012 .

[24]  Robert Wright,et al.  Using infrared satellite data to drive a thermo‐rheological/stochastic lava flow emplacement model: A method for near‐real‐time volcanic hazard assessment , 2008 .

[25]  Ramón Ortiz,et al.  Automatic GIS-based system for volcanic hazard assessment , 2007 .

[26]  S. Kattenhorn,et al.  Structural architecture of a highly oblique divergent plate boundary segment , 2006 .

[27]  M. Favalli,et al.  Forecasting lava flow paths by a stochastic approach , 2005 .

[28]  A. Harris,et al.  FLOWGO: a kinematic thermo-rheological model for lava flowing in a channel , 2001 .

[29]  M. Rossi.  Morphology and mechanism of eruption of postglacial shield volcanoes in Iceland , 1996 .

[30]  S. Jakobsson,et al.  Petrology of the Western Reykjanes Peninsula, Iceland , 1978 .

[31]  M. Wyss,et al.  The Reykjanes Peninsula, Iceland, earthquake swarm of September 1972 and its tectonic significance , 1977 .

[32]  J. G. Jones.  Intraglacial volcanoes of the Laugarvatn region, south-west Iceland—I , 1968, Quarterly Journal of the Geological Society of London.

[33]  S. Tarquini,et al.  MrLavaLoba: A new probabilistic model for the simulation of lava flows as a settling process , 2018 .

[34]  Helgi Björnsson,et al.  Ice-volume changes, bias estimation of mass-balance measurements and changes in subglacial lakes derived by lidar mapping of the surface of Icelandic glaciers , 2013, Annals of Glaciology.