Variability in eruption style and associated very long period events at Fuego volcano, Guatemala

Authors

  • Gregory P. Waite,

    Corresponding author
    1. Department of Geological Engineering and Sciences, Michigan Technological University, Houghton, Michigan, USA
    • Corresponding author: G. P. Waite, Department of Geological Engineering and Sciences, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA. (gpwaite@mtu.edu)

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  • Patricia A. Nadeau,

    1. Department of Geological Engineering and Sciences, Michigan Technological University, Houghton, Michigan, USA
    Current affiliation:
    1. Department of Earth and Planetary Sciences, American Museum of Natural History, New York, New York, USA
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  • John J. Lyons

    1. Department of Geological Engineering and Sciences, Michigan Technological University, Houghton, Michigan, USA
    Current affiliation:
    1. Instituto Geofisico, Escuela Politecnica Nacional, Aptdo, Quito, Ecuador
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Abstract

[1] Repeated short-term deployments of seismic, infrasound, video, and gas-emission instruments at Fuego volcano, Guatemala have revealed three types of very long period (VLP) events associated with conduit sealing, pressure accumulation, and release. In 2008, ash-rich explosions issued from a vent on the western flank and produced one type of VLP (Type 1). Impulsive, bomb-rich explosions from the summit vent in 2009 produced a shorter period VLP (Type 2), but also generated ash release. Type 3 VLP events occurred during ash-free exhalations from the summit in 2008 and had waveform shapes similar to Type 2 events. Weak infrasound records for Type 1 explosions compared to Type 2 suggest lower pressures and higher magma porosity for Type 1. Type 3 events correlate with spikes in SO2 emission rate and are driven by partial sealing and rapid release of ash-free gas at the summit vent. Variations in the VLP period may provide a new tool for monitoring conditions within the conduit.

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