Regional Scale Volcanic Hazard Mapping in Guatemala
Jonathan Collin- Dissertation.pdf (10.13Mb)
Collin, Jonathan P.
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Conventional volcanic hazard maps are created at a local scale, with a single volcano under assessment; this study develops a method for regional scale volcanic hazard mapping in the Central American country of Guatemala. Multiple hazards, for seven volcanoes, identified as causing greatest impact in Guatemala were assessed; including tephra fallout, lahars, lava flows and sector collapses. The main data source of historic volcanic hazards is from INSIVUMEH (Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hidrologia). TephraProb was used for creating scenario based simulations for tephra hazards and LAHARZ was used for simulating lahar hazards based on a high rainfall scenario. Lava flow and sector collapse hazard extents were derived from literature. A successful method in upscaling local individual hazards to a regional scale volcanic risk map was achieved through the use of an areal interpolation method. Lahar, lava flow and sector collapse hazards were amalgamated to become one layer, which were used alongside VEI (Volcano Explosivity Index) and population within 10 km of a volcano as inputs for the interpolation method, resulting in a continuous surface of risk. VulViz is the resulting interactive hazard mapping tool and allows the user to explore the smooth transition between local and regional scales, while reducing data loss through the upscaling process.