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Título del libro: Precipitation: Earth Surface Responses And Processes
Título del capítulo: Rainfall on active volcanoes: Morphological response and associated processes

Autores UNAM:
LUCIA CAPRA PEDOL; ANA MARIA LIZETH CABALLERO GARCIA;
Autores externos:

Idioma:

Año de publicación:
2021
Palabras clave:

Debris flow; Lahar; Precipitation; Volcano; Vulnerability


Resumen:

Active volcanoes continuously register morphological changes during their activity by the emplacement of lava flows and pyroclastic loose material on their flanks. Precipitation represents an external agent that reshapes the volcano edifice by remobilizing large volumes of ash and pyroclastic flow deposits producing lahars, sediment-water, or/and gravity-driven flows. Depending on the regional climatic conditions, lahars can be a very common phenomenon, highly frequent just after an eruption episode and they can persist for several years. The most common lahar initiation mechanism corresponds to the progressive water erosion of material from the catchment and the riverbed, up to bulk to a saturated mixture of sediment and water. Precipitation duration and intensity are the main factors in lahar generation. Orographic (or stationary) and regional (o migratory) rain events can both trigger lahars. In the first case, high intensity, short duration rains trigger low-volume (10*4-10*5. © 2021 Elsevier Inc.


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