Samenvatting
Between 2015 and 2021, Nyiragongo's lava lake level experienced a linear increase punctuated by fast intermittent drops. These drops occurred synchronously to seismic swarm at approximately 15 km below the surface and extending laterally NE from the volcano. To interpret these lava lake level patterns in terms of reservoirs pressure evolution within Nyiragongo, we consider the following simplified plumbing system: a central reservoir is fed by a constant flux of magma, distributing the fluid up into the lava lake and laterally into a distal storage zone. Magma transport is driven by a pressure gradient between the magma storage bodies, accommodating influx and outflow of magma elastically, and the lava lake. Lateral transport at depth occurs through a hydraulic connection for which the flow resistance is coupled to the magma flux. When the right conditions are met, lateral magma transport occurs intermittently and triggers intermittent lava lake level drops matching the observations.
| Originele taal-2 | English |
|---|---|
| Artikelnummer | e2022GL102365 |
| Aantal pagina's | 12 |
| Tijdschrift | Geophysical Research Letters |
| Volume | 50 |
| Nummer van het tijdschrift | 8 |
| DOI's | |
| Status | Published - 28 apr 2023 |
Bibliografische nota
Funding Information:DW is sincerely grateful to Michael Ghil for his teaching about dynamical system theory. The authors acknowledge Derek Elsworth for stimulating discussions. We acknowledge support from the College of Earth and Mineral Sciences of Pennsylvania State University as well as National Science Foundation (NSF) Geophysics Grants EAR 1923943 and EAR 2151005. Lava lake level SAR measurements were supported by the VeRSUS Project (Belgian Science Policy Office, STEREO‐III Programme, Project SR/00/382).
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© 2023. The Authors.
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Copyright 2023 Elsevier B.V., All rights reserved.