Variable SO2 emission rates for Anatahan volcano, the Commonwealth of the Northern Mariana Islands: Implications for deriving arc-wide volatile fluxes from erupting volcanoes

Details Variable SO2 emission rates for Anatahan volcano, the Commonwealth of the Northern Mariana Islands: Implications for deriving arc-wide volatile fluxes from erupting volcanoes Variable SO2 emission rates for Anatahan volcano, the Commonwealth of the Northern Mariana Islands: Implications for deriving arc-wide volatile fluxes from erupting volcanoes

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3414315h&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 14, CiteID L14315

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3

Volcanology: Subduction Zone Processes (1031, 3060, 3613, 8170), Volcanology: Explosive Volcanism, Volcanology: Lava Rheology And Morphology

Scientific paper

We report new spectroscopic-derived SO2 emission rates for Anatahan volcano, Mariana Islands. Measurements of SO2 fluxes reveal large fluctuations over the 2003-2005 period - from 78 kg s-1 which occurred on the same day as resurgent volcanic activity (March, 2005) to 50 kg s-1 and 25 kg s-1 made days/weeks after the start of eruptive sequences in 2003 and 2004 respectively. Even the lowest values make Anatahan a major global source of SO2 over the past decade. These SO2 emission rates are used to estimate the CO2 flux from the arc as a whole (=3.6 - 40 × 107 mol km-1 yr-1). Such values are significantly higher than estimates derived using other approaches: they are also high compared to other convergent margins (e.g., Central America) where the input flux of CO2 is substantially greater. Our results caution against including volatile fluxes from actively-degassing volcanoes to produce volatile outputs considered representative of entire arc fronts.

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