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Article
Observations of eruptive activity at Santiaguito volcano, Guatemala
Journal of Vocanology and Geothermal Research
  • Gregg J. S. Bluth, Michigan Technological University
  • William I. Rose, Michigan Technological University
Document Type
Article
Publication Date
8-25-2004
Abstract
The study of active vent dynamics is hindered by the difficulty of directly observing features and processes during eruptive periods. Here, we describe some recent observations of the summit dome activity of Santiaguito volcano, Guatemala, from the vantage point of its parent, Santa Marı́a. We have taken 12 h of digital video of activity over a 3-year period, which includes 28 eruptions and numerous smaller gas exhalations. Santiaguito persistently extrudes a dacitic lava flow, and produces strombolian eruptions on the order of every 0.5 to 2 h; we have documented many of these eruptions as emitting from a ring-shaped set of fractures in the dome surface. The ring has apparently grown from 70 m diameter in 2002 to 120 m in 2004, which could reflect an increasing conduit opening. Eruptions typically consist of 30–60 s of vigorous emissions; measurements of emission exit velocities have ranged from 5 to 30 m/s. The observed ash bursts, correlated with measured extrusion rates, suggest an incremental plug flow through the conduit. Bubble generation and shearing at the conduit boundaries produce the ring-shaped ash and gas pulses. Continued field studies from this unique observation site may help relate summit emission characteristics to conduit geometry and eruption processes.
Publisher's Statement

© 2004 Elsevier B.V. Publisher's version of record: https://dx.doi.org/10.1016/j.jvolgeores.2004.06.001

Citation Information
Gregg J. S. Bluth and William I. Rose. "Observations of eruptive activity at Santiaguito volcano, Guatemala" Journal of Vocanology and Geothermal Research Vol. 136 Iss. 3-4 (2004) p. 297 - 302
Available at: http://works.bepress.com/william-rose/101/