Bulletin of Volcanology

, 78:62 | Cite as

Eruptive parameters and dynamics of the April 2015 sub-Plinian eruptions of Calbuco volcano (southern Chile)

  • Angelo Castruccio
  • Jorge Clavero
  • Andrea Segura
  • Pablo Samaniego
  • Olivier Roche
  • Jean-Luc Le Pennec
  • Bárbara Droguett
Research Article

Abstract

We conducted geological and petrological analyses of the tephra fallout and pyroclastic density current (PDC) products of the 22-23 April 2015 Calbuco eruptions. The eruptive cycle consisted of two sub-Plinian phases that generated > 15 km height columns and PDCs that travelled up to 6 km from the vent. The erupted volume is estimated at 0.38 km3 (non-DRE), with approximately 90% corresponding to tephra fall deposits and the other 10% to PDC deposits. The erupted products are basaltic-andesite, 54-55 wt.% SiO2, with minor amounts of andesite (58 wt.% SiO2). Despite the uniform composition of the products, there are at least four types of textures in juvenile clasts, with different degrees of vesicularity and types and content of crystals. We propose that the eruption triggering mechanism was either exsolution of volatiles due to crystallization, or a small intrusion into the base of the magma chamber, without significant magma mixing or with a magma compositionally similar to that of the residing magma. In either case the triggering mechanism generated convection and sufficient overpressure to promote the first eruptive phase. The start of the eruption decompressed the chamber, promoting intense vesiculation of the remaining magma and an increase in eruption rate towards the end of the eruption.

Keywords

Calbuco volcano Southern Andes Sub-Plinian eruption Triggering mechanisms 

Supplementary material

445_2016_1058_MOESM1_ESM.pdf (157 kb)
ESM 1(PDF 157 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Angelo Castruccio
    • 1
    • 2
  • Jorge Clavero
    • 3
    • 4
  • Andrea Segura
    • 1
    • 2
  • Pablo Samaniego
    • 5
  • Olivier Roche
    • 5
  • Jean-Luc Le Pennec
    • 5
  • Bárbara Droguett
    • 3
    • 4
  1. 1.Departamento de GeologíaUniversidad de ChileSantiagoChile
  2. 2.CEGA (Centro de Excelencia en Geotermia de los Andes)SantiagoChile
  3. 3.Amawta Geoconsultores Ltda.SantiagoChile
  4. 4.Escuela de GeologíaUniversidad MayorSantiagoChile
  5. 5.Laboratoire Magmas et VolcansUniversité Blaise Pascal-CNRS-IRDAubièreFrance

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