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Identifying precursors and tracking pulses of magma ascent in multidisciplinary data during the 2018–2023 phreatomagmatic eruption at Semisopochnoi Island, Alaska

https://doi.org/10.1016/j.jvolgeores.2025.108329

Lyons, John J; Tan, Darren; Angarita, Mario; Loewen, Matthew W; Lopez, Taryn; Grapenthin, Ronni; Hotovec-Ellis, Alicia J; Fee, David; Haney, Matthew M (July 2025, Journal of Volcanology and Geothermal Research)

Free, publicly-accessible full text available July 1, 2026
Deformation at the open-vent Erebus volcano, Antarctica, from more than 20 years of GNSS observations

https://doi.org/10.1016/j.jvolgeores.2022.107703

Grapenthin, Ronni; Kyle, Philip; Aster, Richard C.; Angarita, Mario; Wilson, Terry; Chaput, Julien (December 2022, Journal of Volcanology and Geothermal Research)

Full Text Available
Understanding the drivers of volcano deformation through geodetic model verification and validation

https://doi.org/10.1007/s00445-023-01687-4

Crozier, Josh; Karlstrom, Leif; Montgomery-Brown, Emily; Angarita, Mario; Cayol, Valérie; Bato, Mary Grace; Wang, Taiyi A.; Grapenthin, Ronni; Shreve, Tara; Anderson, Kyle; et al (December 2023, Bulletin of Volcanology)

Full Text Available
Return From Dormancy: Rapid Inflation and Seismic Unrest Driven by Transcrustal Magma Transfer at Mt. Edgecumbe (L’úx Shaa) Volcano, Alaska

https://doi.org/10.1029/2022GL099464

Grapenthin, Ronni; Cheng, Yitian; Angarita, Mario; Tan, Darren; Meyer, Franz J.; Fee, David; Wech, Aaron (October 2022, Geophysical Research Letters)

Abstract In April 2022, a seismic swarm near Mt. Edgecumbe in southeast Alaska suggested renewed activity at this transform fault volcano, which was last active ≈800 years ago. Previously, thin rhyolitic tephras were deposited 5 and 4 ka. Satellite radar data from 2014 to 2022 resolves line‐of‐sight rapid inflation up to 7.1 cm/yr beginning in August 2018. Bayesian modeling suggests a transcrustal system of a deflating (−0.528 km³) dipping sill at 20 km depth recharging a magma chamber at 10 km (0.222 km³). A near‐vertical conduit could capture the volume difference without noticeable surface deformation. Reanalyzed seismicity, recorded 25 km away, shows increases since July 2019. Magma ascent through ductile material and brittle strain release in a stressed overburden could explain the time delay. Cloud‐native open data and workflows enabled discovery and analysis of this signal within days after going unnoticed for >3 years.
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