Multidisciplinary observations of the 2011 explosive eruption of Telica volcano, Nicaragua: Implications for the dynamics of low-explosivity ash eruptions
Artikel i vetenskaplig tidskrift, 2014

We present multidisciplinary observations of the March-June 2011 VEI 2 eruptive episode of the basalticandesite Telica volcano, Nicaragua, which allow for a comprehensive study of the eruption mechanics of low-explosivity eruptions at persistently active volcanoes. The observations are from a dense network of seismic and GPS instrumentation augmented by visual observations of the eruptive episode, geochemical and petrologic analysis of eruptive products, plume SO2 measurements, and temperature measurements of fumaroles inside and outside the active vent. The 2011 eruptive episode was Telica's most explosive since 1999 and consisted of numerous vulcanian explosions, with maximum column heights of 1.5-2 km above the crater rim, depositing a low volume of dominantly hydrothermally altered ash. Based on observed variations in seismicity, temperature, and SO2 flux, the lack of deformation of the edifice, the non-juvenile origin of and predominance of accretionary lapilli in the ash, we propose that temporary sealing of the hydrothermal system between similar to 0.5 and 2 km depth, allowed pressure to build up prior to vulcanian explosions, making this a phreatic eruptive episode.

LEACHATES

observations

Phreatic eruptions

DEFORMATION

SEISMICITY

INFRASOUND

EARTHQUAKE

Persistently restless volcanoes

Eruption forecasting

GALERAS VOLCANO

CENTRAL-AMERICAN VOLCANOS

Multidisciplinary

ALASKA

POPOCATEPETL VOLCANO

SHISHALDIN-VOLCANO

Vulcanian explosions

Hydrothermal systems

Författare

H. Geirsson

Pennsylvania State University

M. Rodgers

University of South Florida Tampa

P. LaFemina

Pennsylvania State University

M. Witter

Pennsylvania State University

D. Roman

Carnegie Institution of Washington

University of South Florida Tampa

A. Munoz

Instituto Nicaragüense de Estudios Territoriales

V. Tenorio

Instituto Nicaragüense de Estudios Territoriales

J. Alvarez

Instituto Nicaragüense de Estudios Territoriales

Alexander Vladimir Conde Jacobo

Chalmers, Rymd- och geovetenskap, Optisk fjärranalys

Daniel Nilsson

Chalmers, Rymd- och geovetenskap, Optisk fjärranalys

Bo Galle

Chalmers, Rymd- och geovetenskap, Optisk fjärranalys

M. D. Feineman

Pennsylvania State University

T. Furman

Pennsylvania State University

A. Morales

Instituto Nicaragüense de Estudios Territoriales

Journal of Volcanology and Geothermal Research

0377-0273 (ISSN)

Vol. 271 55-69

Ämneskategorier

Geovetenskap och miljövetenskap

DOI

10.1016/j.jvolgeores.2013.11.009