Abstract Details

Details of the Abstract

Title of paper 3-D resistivity imaging of the Misti Volcano (Peru) from broadband Magnetotelluric data: Preliminary results
List of authors Romero-Beltran, G., Antayhua, Y., Torres, J.L., Byrdina, S., Tavera, H., Ledo, L., Rath, V., Alvarez, Y.
Affiliation(s) Departamento de Ciencias de la Tierra Sólida - Instituto Geofísico del Perú (Arequipa-Perú) , Departamento de Ciencias de la Tierra Sólida - Instituto Geofísico del Perú (Arequipa-Perú),
Departamento de Ciencias de la Tierra Sólida - Instituto Geofísico del Perú (Arequipa-Perú),
Université Grenoble Alpes - Université Savoie Mont Blanc, CNRS, IRD, Univ. Gustave Eiffel, ISTerre, 38000 Grenoble- France,
Departamento de Ciencias de la Tierra Sólida - Instituto Geofísico del Perú (Arequipa-Perú),
Departamento de Física de la Tierra y Astrofísica -Universidad Complutense de Madrid (Spain), Dublin Institute for Advanced Studies, Geophysics Section, 5 Merrion Square, Dublin- Ireland, Departamento de Ciencias de la Tierra Sólida - Instituto Geofísico del Perú (Arequipa-Perú),
Summary The dehydration of oceanic slabs generates fluids that rise through continental crust, forming magmatic fluids crucial for volcano formation in subduction arcs. Understanding magma ascent and storage depth is vital for assessing volcanic hazards. Misti Volcano, near Arequipa, Peru, poses risks to nearly 1 million inhabitants. Recent eruptions show an andesitic evolution diverging from earlier dacite and andesite eruptions, suggesting changes in magmatic conditions. This study evaluates Misti's internal magmatic and hydrothermal systems using 30 broadband magnetotelluric soundings. A resistive model constructed through 3D inversion reveals a thin conductive layer beneath the volcano, likely due to hydrothermal alteration. No high conductive anomalies, typical of partial melting or magmatic saline deposits, are observed beneath the crater. Instead, a slight conductivity plume surrounded by a resistive domain is identified, indicating an active volcanic system. These findings contribute to understanding Misti's volcanic activity and associated hazards
Session Keyword 4.0 Tectonics and geodynamics, including magmatism
File upload 4.0_3-d_resistivity_imaging_o_romero-beltran.pdf
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