000007394 001__ 7394
000007394 005__ 20250122114627.0
000007394 0247_ $$2DOI$$a10.22201/cgeo.20072902e.2023.1.1707
000007394 037__ $$aSCART-2025-0044
000007394 100__ $$aArzate, Jorge
000007394 245__ $$aThe magmatic system of the Colima Volcano from magnetotelluric and ambient noise data
000007394 260__ $$c2023
000007394 520__ $$aHere we present the results obtained from the 3D inversion of the full impedance of 21 magnetotelluric soundings in the frequency range of 1000–0.05 Hz. The results confirm the existence of a flat lying conductor at a depth of 2–4 km bmsl under the Colima Volcano (CV) acting as a natural cap seal of the Colima Volcanic Complex hydrothermal system. Model results along five EW vertical sections extracted from the 3D inverted impedance show that the upper crust (<15 km) in the northern sector of the CVC is far more resistive (>1000 ohm·m) and compact than in the southern zone, where it becomes more conductive and apparently more fragmented. The combined results of horizontal and vertical resistivity slices and sections reveals a vertical conductor (10–20 ohm·m) of ellipsoidal shape under the Colima Volcano, which extend from about 5 km bmsl down to at least 15 km bmsl. The approximate dimensions of the major and minor axis of the elliptical conduit along the fault are about 20 km and 5 km respectively. The major axis of the ellipsoidal enhanced conducting pathway is parallel to a NS fault segment off the main NE-SW fault system, which suggests that this fault segment is currently controlling the magmatic fluids ascent. Down to about 15-18 km bmsl the crust becomes widespread conductive, coinciding with a flat body of low shear-wave velocity (<3.2 km/s) under the Colima Volcano at similar depths. This low density and low resistivity flat lying mush reservoir contains H2O-rich melts prone to be polarized electrically and to polarize the surrounding medium. The supporting evidence suggest that the recent and nearfuture activity of the CV is closely related to a deep flat magmatic source rather than to a shallow magmatic chamber, and that the triggering mechanism of recurrent magmatic activity of the CV may have an electrical component.
000007394 594__ $$aNO
000007394 6531_ $$aVolcanology
000007394 6531_ $$aMush reservoir
000007394 6531_ $$aSeismic noise
000007394 6531_ $$aMagnetotellurics
000007394 6531_ $$a3D inversion
000007394 700__ $$aRomo-Lozano, Héctor
000007394 700__ $$aDe Plaen, Raphael 
000007394 700__ $$aCorbo‑Camargo, Fernando
000007394 773__ $$c71-84$$n1$$pRevista Mexicana de Ciencias Geológicas$$v40$$y2023
000007394 8560_ $$fraphael.deplaen@ksb-orb.be
000007394 905__ $$apublished in
000007394 980__ $$aREFERD