Yitian Cheng
Mario Angarita
Darren Tan
Franz J. Meyer
David Fee
Aaron Wech
R. Grapenthin
2022
<div class="article-section__content en main"><p>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 km<sup>3</sup>) dipping sill at 20 km depth recharging a magma chamber at 10 km (0.222 km<sup>3</sup>). 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.</p></div>
application/pdf
10.1029/2022GL099464
en
American Geophysical Union
Return from dormancy: Rapid inflation and seismic unrest driven by transcrustal magma transfer at Mt. Edgecumbe (L’´ux Shaa) Volcano, Alaska
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