The 2007 Caldera Collapse of Piton de la Fournaise Volcano: Source Process from Very-Long-Period Seismic Signals

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: This is version 4 of this Preprint.


Download Preprint

Supplementary Files

Zacharie Duputel , Luis Rivera


In April 2007, Piton de la Fournaise volcano experienced its largest caldera collapse in at least 300 years. This event consisted of a series of 48 subsidence increments characterized by very-long-period (VLP) seismic signals equivalent to Mw 4.4 to 5.4. Source analysis of VLP events suggests a piston-like mechanism with a collapsing crack source corresponding to the contraction of the magma reservoir and a single force representing the collapse of the above rock column. We show that the collapse dynamics is primarily controlled by magma withdrawal from the reservoir, which was likely in a bubbly state at the time of the event. Similar to the 2018 Kilauea collapse, we observe a reduction of the time-interval between successive subsidence increments, which results from the acceleration of magma withdrawal and a progressive weakening of the edifice at the beginning of the sequence.



Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics


Surface waves, Caldera collapse, Magma reservoir processes, Piton de la Fournaise, Single force source


Published: 2019-05-31 23:56

Last Updated: 2019-09-18 22:52

Older Versions

CC BY Attribution 4.0 International

Add a Comment

You must log in to post a comment.


There are no comments or no comments have been made public for this article.