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Title: Anatomy of phreatic eruptions
Authors: Caudron, Corentin
Taisne, Benoit
Neuberg, Jurgen
Jolly, Arthur D.
Christenson, Bruce
Lecocq, Thomas
Syahbana, Devy
Suantika, Gede
Keywords: Volcanic Monitoring
Phreatic Eruption
Science::Geology::Volcanoes and earthquakes
Issue Date: 2018
Source: Caudron, C., Taisne, B., Neuberg, J., Jolly, A. D., Christenson, B., Lecocq, T., … Suantika, G. (2018). Anatomy of phreatic eruptions. Earth, Planets and Space, 70(1). doi:10.1186/s40623-018-0938-x
Series/Report no.: Earth, Planets and Space
Abstract: This study investigates phreatic eruptions at two similar volcanoes, Kawah Ijen (Indonesia) and White Island (New Zealand). By carefully processing broadband seismic signals, we reveal seismic signatures and characteristics of these eruptions. At both volcanoes, the phreatic eruptions are initiated by a very-long-period (VLP) seismic event located at shallow depths between 700 and 900 m below the crater region, and may be triggered by excitation of gas trapped behind a ductile magma carapace. The shallow hydrothermal systems respond in different ways. At Kawah Ijen, the stress change induced by VLPs directly triggers an eigenoscillation of the hyperacidic lake. This so-called seiche is characterized by long-lasting, long-period oscillations with frequencies governed by the dimensions of the crater lake. A progressive lateral rupture of a seal below the crater lake and/or fluids migrating toward the surface is seismically recorded ∼ 15 min later as high-frequency bursts superimposed to tilt signals. At White Island, the hydrothermal system later (∼ 25 min) responds by radiating harmonic tremor at a fixed location that could be generated through eddy-shedding. These seismic signals shed light on several aspects of phreatic eruptions, their generation and timeline. They are mostly recorded at periods longer than tens of seconds further emphasizing the need to deploy broadband seismic equipment close to active volcanic activity.
ISSN: 1343-8832
DOI: 10.1186/s40623-018-0938-x
Rights: © 2018 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creat iveco mmons .org/licen ses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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