Ring Fault Slip Reversal at Bárðarbunga Volcano, Iceland: Seismicity during Caldera Collapse and Re‐Inflation 2014–2018 ...

• Main Authors: Glastonbury‐Southern, E, Winder, T, White, RS, Brandsdóttir, B
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Geophysical Union (AGU) 2022
• Subjects: Iceland
• Online Access: https://dx.doi.org/10.17863/cam.89871; https://www.repository.cam.ac.uk/handle/1810/342451

Microearthquakes reveal the kinematics of the Bárðarbunga caldera ring fault; during the 2014–2015 rifting event and gradual caldera collapse, and its subsequent, ongoing re-inflation. Tightly constrained focal mechanisms during re-inflation have reversed phase arrival polarities from events during the caldera collapse. Thus, the inner side of the steeply dipping northern caldera faults (averaging 81±8°) has been moving upwards during the post-eruptive period. Both precise relative relocations of the seismicity and fault plane solutions confirm that this is due to slip reversal on the same ring fault structure. ...