Reservoir depressurization driven by passive gas emissions at Ambrym volcano
نویسندگان
چکیده
Despite being a widespread and common process, the impact of passive volcanic degassing on pressurization state magma reservoir is not well understood. If mass loss due to gas emissions results in depressurization surface subsidence, pressure difference between shallow deep source may result recharge eventually trigger an eruption. It therefore important determine how simplified reservoir-conduit system responds such processes. Here we use extreme example persistent degassing—Ambrym—as case study relate sulphur dioxide flux with edifice-scale both measured from satellite-based remote sensing observations. A geodetic inversion displacements Interferometric Synthetic Aperture Radar modeled using Boundary Element Method provides bounds change during episode subsidence at Ambrym 2015 2017. These are input into lumped parameter theoretical model developed by Girona et al. (2014), free parameters (e.g., size conduit radius) systematically explored. We find that 2015–2017 consistent decreasing rate −5.2 −2.0 MPa year−1 ∼2 km b.s.l., as degassing. The observed end abruptly October 2017, no significant deformation detected 14 months leading up rift zone intrusion submarine eruption December 2018, despite substantial explain this lack pre-eruptive influx ∼0.16 km3 (<2 b.s.l.) counterbalances caused This volume comparable subsequently extracted Ambrym's 2018. conclude some open-vent passively volcanoes, deflation reduce or even cancel any inflation signal influx. Nonetheless, detection can be achieved monitoring changes long-term rate.
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2022
ISSN: ['1385-013X', '0012-821X']
DOI: https://doi.org/10.1016/j.epsl.2022.117512