Preliminary report on the July 10-11, 2015 eruption at Volcán de Colima: Pyroclastic density currents with exceptional runouts and volume
Por:
Capra, L., Macias, J. L., Cortes, A., Davila, N., Saucedo, R., Osorio-Ocampo, S., Arce, J. L., Gavilanes-Ruiz, J. C., Corona-Chavez, P., Garcia-Sanchez, L., Sosa-Ceballos, G., Vazquez, R.
Publicada:
15 ene 2016
Resumen:
On July 10-11, 2015 an eruption occurred at Colima volcano produced 10.5 km long pyroclastic density currents (PDCs) along the Montegrande, and 6.5 km long along the San Antonio ravines. The summit dome was destroyed and a new crater excavated and breached to the south. This new breach connects to a narrow channel that descends along Colima's southern flank and was used by a subsequent lava flow. The Montegrande PDCs represent the longest and hottest flow of this type recorded during the past 30 years but are still smaller in comparison to the 15-km long PDCs produced during the 1913 Plinian eruption. Data obtained from field reconnaissance, lahar monitoring stations, and satellite imagery suggest that at least six PDCs occurred. The two largest PDCs (H/L 0.2) were able to surmount topographic barriers or bends. Based on field reconnaissance and digital elevation models extracted from SPOT satellite imageries we estimate a minimum volume for the valley-pond and distal fan deposits of 4.5 × 106 m3. After one week, the deposits were still hot with burning trees on the surface and millimeter-sized holes from which fumes were emanating. The juvenile components of the deposits consist of gray dense blocks and vesicular dark-gray blocks and bombs with bread-crust textures and cooling joints. The mineral association of these rocks consists of plagioclase + clinopyroxene + orthopyroxene + FeTi-oxides ± olivine and resorbed hornblende in a dark glassy matrix that corresponds to an andesitic composition. © 2015 Elsevier B.V..
Filiaciones:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Campus Juriquilla, Queretaro 76230, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, Unidad Michoacan, Campus Morelia, Morelia 58090, Michoacan, Mexico
Univ Colima, Ctr Univ Estudios & Invest Vulcanol, Colima 28045, Mexico
Univ Autonoma Estado Mexico, Fac Geog, Lab Sistemas Informac Geog, Mexico City, DF, Mexico
Univ Autonoma San Luis Potosi, Inst Geol, Mexico City, DF, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, Posgrado Ciencias Tierra, Mexico City 04510, DF, Mexico
Univ Colima, Colima 28045, Mexico
Univ Michoacana, Inst Invest Ciencias Tierra, Morelia 58040, Michoacan, Mexico
UNAM, Ctr Geociencias, Posgrado Ciencias Tierra, Campus Juriquilla, Queretaro 76230, Mexico
|