Available online at EPSL: https://authors.elsevier.com/a/1YlKR,Ig4G-Zm. Click here for a PDF.
Highlights
- There is a shallow low-velocity, high-porosity volume in the north-central caldera.
- Vents of the first 3 LBA eruption phases correlate with this inner structure.
- Inner collapse involved reverse faults, volcanic deposits, and/or rock fractures.
- The low-density volume may cause magma recharge to localize beneath it.
- The outer topographic caldera formed by relatively coherent down drop.
A summary cartoon:
