Item talk:Q257631

From geokb

{

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   "name": "Insights into the mechanisms of phreatic eruptions from continuous high frequency volcanic gas monitoring: Rinc\u00f3n de la Vieja volcano, Costa Rica",
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     "name": "Frontiers in Earth Science",
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   "abstract": "Understanding the trigger mechanisms of phreatic eruptions is key to mitigating the effects of these hazardous but poorly forecastable volcanic events. It has recently been established that high-rate volcanic gas observations are potentially very suitable to identifying the source processes driving phreatic eruptions, and to eventually detecting precursory changes prior to individual phreatic blasts. In February-May 2017, we deployed a Multi-GAS instrument to continuously monitor gas concentrations in the crater lake plume of Rinc\u00f3n de la Vieja, a remote and poorly monitored active volcano in Costa Rica, site of frequent phreatic/phreatomagmatic eruptions. Forty-two phreatic/phreatomagmatic eruptions were seismically recorded during our investigated period, 9 of which were also recorded for gas by the Multi-GAS. To the best of our knowledge, these represent the first instrumentally measured gas compositions during individual phreatic/phreatomagmatic explosions at an active volcano. Our results show that during background quiescent degassing the Rinc\u00f3n de la Vieja crater lake plume was characterized by high CO2/SO2\u00a0ratios of 64 \u00b1 59 and H2S/SO2\u00a0ratios of 0.57 \u00b1 0.20. This composition is interpreted as reflecting hydrothermal (re)processing of magma-sourced gas in the sub-limnic environment. Phreatic blasts were recorded by the Multi-GAS as brief (1\u20132 min long) pulses of elevated gas mixing ratios (up to ~52 ppmv SO2\u00a0and >3,000 ppmv CO2), or more than an order of magnitude higher than during background degassing (~1 ppmv SO2\u00a0and ~450 ppmv CO2). During the phreatic eruption(s), the H2S/SO2\u00a0ratio was systematically lower (<0.18) than during background degassing, but the CO2/SO2\u00a0ratio remained high (and variable), ranging from 37 to 390. These S-poor compositions for the eruptive gas imply extensive processing of the source magmatic gas during pre-eruptive hydrothermal storage, likely by deposition of native S and/or sulfate. Our gas results are thus overall consistent with a mechanism of phreatic eruptions triggered by accumulation of magmatic-hydrothermal gases beneath a hydrothermal seal. We claim that real-time Multi-GAS monitoring is urgently needed at other crater lake-hosting volcanoes (e.g., Ruapehu, Aso), where phreatic eruptions may similarly be preceded by phases of reduced S degassing at the surface.",
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