Monitoreo de la alteración hidrotermal en volcanes activos mediante teledetección: el caso del volcán Turrialba (Costa Rica)

Abstract

Hydrothermal alteration was analyzed in the active system of Turrialba Volcano, Central Volcanic Range, Costa Rica Principal component analysis (PCA) techniques are applied to Thematic Mapper (1986 and 2001) and MODIS/ASTER airborne imagery (2003) Analyses were carried out using 4 input bands in principal component analysis transformations to detect clays and iron oxides The technique was adapted to MASTER sensor, selecting relevant bands for mineral detection Argilic and limonitic zones were mapped for 1986, 2001 and 2003 Image analysis results are consistent with volcanic activity from 1986 to 2003, the activity was concentrated at the central craters and SW Area graven is limited properly showing alterations (limonitic and argillized) and N-S alignment Multitemporal analysis has showed an enlargement in alteration areas between 1986 and 2003 in the craters named Recent phreatic eruptions since 2010 have occurred in the same areas, validating the results The research has contributed to the establishment of monitoring systems of volcanic areas based on remote sensing (author)