Volcan de Colima dome collapse of July, 2015 and associated pyroclastic density currents
Por:
Reyes-Davila, Gabriel A., Arambula-Mendoza, Raul, Espinasa-Perena, Ramon, Pankhurst, Matthew J., Navarro-Ochoa, Carlos, Savov, Ivan, Vargas-Bracamontes, Dulce M., Cortes-Cortes, Abel, Gutierrez-Martinez, Carlos, Valdes-Gonzalez, Carlos, Dominguez-Reyes, Tonatiuh, Gonzalez-Amezcua, Miguel, Martinez-Fierros, Alejandro, Ariel Ramirez-Vazquez, Carlos, Cardenas-Gonzalez, Lucio, Castaneda-Bastida, Elizabeth, Vazquez Espinoza de los Monteros, Diana M., Nieto-Torres, Amiel, Campion, Robin, Courtois, Loic, Lee, Peter D.
Publicada:
15 jun 2016
Resumen:
During July 10th-11th 2015, Volcan de Colima, Mexico, underwent its most
intense eruptive phase since its Subplinian-Plinian 1913 AD eruption.
Production of scoria coincident with elevated fumarolic activity and SO2
flux indicate a significant switch of upper-conduit dynamics compared
with the preceding decades of dome building and vulcanian explosions. A
marked increase in rockfall events and degassing activity was observed
on the 8th and 9th of July. On the 10th at 20:16 h (Local time = UTM - 6
h) a partial collapse of the dome generated a series of pyroclastic
density currents (PDCs) that lasted 52 min and reached 9.1 km to the
south of the volcano. The PDCs were mostly channelized by the
Montegrande and San Antonio ravines, and produced a deposit with an
estimated volume of 2.4 x 10(6) m(3). Nearly 16 h after the first
collapse, a second and larger collapse occurred which lasted 1 h 47 min.
This second collapse produced a series of PDCs along the same ravines,
reaching a distance of 10.3 km. The total volume calculated for the PDCs
of the second event is 8.0 x 10(6) m(3). Including associated ashfall
deposits, the two episodes produced a total of 14.2 x 10(6) m(3) of
fragmentary material. The collapses formed an amphitheater-shaped crater
open towards the south. We propose that the dome collapse was triggered
by arrival of gas-rich magma to the upper conduit, which then
boiled-over and sustained the PDCs. A juvenile scoria sample selected
from the second partial dome collapse contains hornblende, yet at an
order of magnitude less abundant (0.2%) than that of 1913, and exhibits
reaction rims, whereas the 1913 hornblende is unreacted. At present
there is no compelling petrologic evidence for imminent end-cycle
activity observed at Volcan de Colima. (C) 2016 The Authors. Published
by Elsevier B.V.
Filiaciones:
Reyes-Davila, Gabriel A.:
Univ Colima, CUEIV, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Arambula-Mendoza, Raul:
Univ Colima, CUEIV, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Espinasa-Perena, Ramon:
Ctr Nacl Prevenc Desastres CENAPRED, Av Delfin Madrigal 665,Col Pedregal Santo Domingo, Ciudad De Mexico 04360, Mexico
Pankhurst, Matthew J.:
Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
Navarro-Ochoa, Carlos:
Univ Colima, CUEIV, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Savov, Ivan:
Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
Vargas-Bracamontes, Dulce M.:
Univ Colima, CUEIV, Catedras CONACYT, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Cortes-Cortes, Abel:
Univ Colima, CUEIV, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Gutierrez-Martinez, Carlos:
Ctr Nacl Prevenc Desastres CENAPRED, Av Delfin Madrigal 665,Col Pedregal Santo Domingo, Ciudad De Mexico 04360, Mexico
Valdes-Gonzalez, Carlos:
Ctr Nacl Prevenc Desastres CENAPRED, Av Delfin Madrigal 665,Col Pedregal Santo Domingo, Ciudad De Mexico 04360, Mexico
Dominguez-Reyes, Tonatiuh:
Univ Colima, CUEIV, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Gonzalez-Amezcua, Miguel:
Univ Colima, CUEIV, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Martinez-Fierros, Alejandro:
Univ Colima, CUEIV, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Ariel Ramirez-Vazquez, Carlos:
Univ Colima, CUEIV, Av Bernal Diaz Castillo 340, Colima 28045, Colima, Mexico
Cardenas-Gonzalez, Lucio:
Ctr Nacl Prevenc Desastres CENAPRED, Av Delfin Madrigal 665,Col Pedregal Santo Domingo, Ciudad De Mexico 04360, Mexico
Castaneda-Bastida, Elizabeth:
Ctr Nacl Prevenc Desastres CENAPRED, Av Delfin Madrigal 665,Col Pedregal Santo Domingo, Ciudad De Mexico 04360, Mexico
Vazquez Espinoza de los Monteros, Diana M.:
Ctr Nacl Prevenc Desastres CENAPRED, Av Delfin Madrigal 665,Col Pedregal Santo Domingo, Ciudad De Mexico 04360, Mexico
Nieto-Torres, Amiel:
Ctr Nacl Prevenc Desastres CENAPRED, Av Delfin Madrigal 665,Col Pedregal Santo Domingo, Ciudad De Mexico 04360, Mexico
Campion, Robin:
Univ Nacl Autonoma Mexico, Inst Geofis, Circuito Cient S-N, Coyoacan 04510, DF, Mexico
Courtois, Loic:
Univ Manchester, Sch Mat, Manchester Xray Imaging Facil, Manchester M13 9PL, Lancs, England
Rutherford Appleton Labs, Res Complex Harwell, Didcot OX11 0FA, Oxon, England
Lee, Peter D.:
Univ Manchester, Sch Mat, Manchester Xray Imaging Facil, Manchester M13 9PL, Lancs, England
Rutherford Appleton Labs, Res Complex Harwell, Didcot OX11 0FA, Oxon, England
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