Abstract
Satellite radar interferometry data reveal strong localized uplift in a semi‐ circular pattern on the southwest flank of Fernandina volcano, Galápagos, where an eruption took place in January to April, 1995. The observations show a maximum decrease in radar range of 0.75 m, and they are consistent with a model of a shallow‐dipping dike intrusion feeding this fissure eruption. We solve for the best‐fit single rectangular dislocation dike source using non‐linear inversion techniques where simulated annealing searching algorithm is used to avoid local minima. The best‐fit dike is 3.8 km long, 2.3 km high, 0.86 m thick and with a 34° dip. The total dike volume (7.5 × 10−3 km³) is ∼40% of the volume of extrusive materials estimated to have been produced during the eruption. The data do not permit a sub‐vertical dike, implying that the least principal stress direction is not horizontal as is usually assumed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
