Mostrar el registro sencillo del ítem Finizola, Anthony Lénat, Jean-François Macedo Sánchez, Orlando Efraín Ramos Palomino, Domingo A. Thouret, Jean-Claude Sortino, Francesco 2018-10-31T17:11:25Z 2018-10-31T17:11:25Z 2004-03
dc.identifier.issn 0377-0273
dc.description En: Journal of Volcanology and Geothermal Research, n. 135 (2004), p. 343–360. es_ES
dc.description.abstract "One of the seven potentially active andesite stratovolcanoes in southern Peru, Misti (5822 m), located 17 km northeast and 3.5 km above Arequipa, represents a major threat to the population ( f 900,000 inhabitants). Our recent geophysical and geochemical research comprises an extensive self-potential (SP) data set, an audio –magnetotelluric (AMT) profile across the volcano and CO2 concentrations in the soil along a radial profile. The SP survey is the first of its kind in providing a complete mapping of a large andesitic stratovolcano 20 km in diameter. The SP mapping enables us to analyze the SP signature associated with a subduction-related active volcano. The general SP pattern of Misti is similar to that of most volcanoes with a hydrogeologic zone in the lower flanks and a hydrothermal zone in the upper central area. A quasi-systematic relationship exists between SP and elevation. Zones with constant SP/altitude gradients (Ce) are observed in both hydrogeologic (negative Ce) and hydrothermal (positive Ce) zones. Transition zones between the different Ce zones, which form a concentric pattern around the summit, have been interpreted in terms of lateral heterogeneities in the lithology. The highest amplitudes of SP anomalies seem to coincide with highly resistive zones. The hydrothermal system 6 km in diameter, which extends over an area much larger than the summit caldera, may be constrained by an older, concealed collapse caldera. A sealed zone has apparently developed through alteration in the hydrothermal system, blocking the migration of CO2 upward. Significant CO2 emanations are thus observed on the lower flanks but are absent above the hydrothermal zone" es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher Journal of Volcanology and Geothermal Research es_ES
dc.relation.uri es_ES
dc.relation.uri es_ES
dc.rights info:eu-repo/semantics/embargoedAccess es_ES
dc.rights.uri info:eu-repo/semantics/restrictedAccess es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Vulcanología--Perú--Arequipa es_ES
dc.subject Misti, Volcán (Are., Perú) es_ES
dc.subject Recursos geotérmicos--Perú es_ES
dc.subject Depósitos hidrotermales--Perú es_ES
dc.subject Volcanes--Perú--Arequipa--Observaciones es_ES
dc.title Fluid circulation and structural discontinuities inside Misti volcano (Peru) inferred from self-potential measurements es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Volcanes es_ES
dc.subject.ocde Perú es_ES
dc.subject.ocde Hidrogeología es_ES
dc.subject.ocde Vulcanología es_ES
dc.identifier.journal Journal of Volcanology and Geothermal Research es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.1016/j.jvolgeores.2004.03.009 es_ES




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