Long-period microseismicity reveals cryptic earthquake-triggered fluid activity can facilitate caldera eruptions.

ABSTRACT: Spatiotemporal correlations between moderate-to-large earthquakes and volcanic eruptions indicate that earthquake-induced stress changes can trigger eruptions. Triggering is rarely instantaneous, with time-dependent processes inferred to mediate magma ascent to the surface, such as fracture propagation or fluid pressurization. While various processes have been proposed, observational constraints on the specific triggering mechanisms remain limited. Here we integrate an earthquake catalogue, generated by machine-learning and template-matching techniques to enhance microseismicity detections, with geodetic data to show that seismic triggering of the 2018 eruption of Sierra Negra Volcano, Galápagos Islands, was facilitated by a cryptic phase of fluid activity. Following 13 years of near-conti

SUBMITTER: Song Z 

PROVIDER: S-EPMC12946353 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature