Forecasting lava flow paths by a stochastic approach

A stochastic model, named DOWNFLOW, is presented to forecast possible lava flow paths with the aim of hazard assessment and mitigation. The model relies on the fact that lava flow emplacement is, in many cases, controlled by topography. The potential inundation area of the flow is determined by considering a number of steepest paths over stochastic perturbations of the original topography. Since the code requires very short computational time and few input data the model proved to be a very useful tool to obtain real‐time predictions during the initial phase of an eruption. The necessary topographic information can be obtained by photogrammetry, radar altimetry, or laser scanning techniques. DOWNFLOW has been successfully applied to a number of flows, including the September 2004 lava flow, where updated topographies were available.

[1]  G. Walker.  Compound and simple lava flows and flood basalts , 1971 .

[2]  J. Murray,et al.  An analysis of hazard from Mount Etna volcano , 1979, Journal of the Geological Society.

[3]  M. Dragoni,et al.  Downslope flow models of a Bingham liquid: Implications for lava flows , 1986 .

[4]  P. Young,et al.  Mapping lava flow hazards using computer simulation , 1994 .

[5]  Sho Sasaki,et al.  Simulating lava flows by an improved cellular automata method , 1997 .

[6]  G. Wadge,et al.  The volume and shape of the 1991–1993 lava flow field at Mount Etna, Sicily , 1997 .

[7]  S. Calvari,et al.  Formation of lava tubes and extensive flow field during the 1991–1993 eruption of Mount Etna , 1998 .

[8]  M. Favalli,et al.  The DEM of Mt. Etna: Geomorphological and structural implications , 1999 .

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

[10]  Boris Behncke,et al.  The July–August 2001 eruption of Mt. Etna (Sicily) , 2003 .

[11]  F. Brondi,et al.  Earthen barriers to control lava flows in the 2001 eruption of Mt. Etna , 2003 .

[12]  M. Favalli,et al.  Digital elevation model construction from structured topographic data: The DEST algorithm , 2004 .

[13]  G. M. Crisci,et al.  The simulation model SCIARA: the 1991 and 2001 lava flows at Mount Etna , 2004 .

[14]  Andrea Tallarico,et al.  Modeling of the steady-state temperature field in lava flow levées , 2004 .

[15]  Maria Teresa Pareschi,et al.  Morphology of basaltic lava channels during the Mt. Etna September 2004 eruption from airborne laser altimeter data , 2005 .