This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.epsl.2023.118323. This is version 1 of this Preprint.
Tracking Changes in Magma Transport from Very-Long-Period seismic signals at Piton de la Fournaise volcano
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Authors
Zacharie Duputel,
Valérie Ferrazzini,
Cyril Journeau 
,
Philippe Caterine,
Philippe Kowalski,
Aline Peltier
Abstract
Changes in magma properties and transport geometry can have a direct impact on volcanic activity. However, such variations can be difficult to track during eruptions. We report previously undetected very-long-period (VLP) signals at Piton de la Fournaise that can be used to probe changes in magma transport. Source analysis of VLP events during the August-October 2015 eruption indicates a source depth of about 0.9-1.2 km and points to the resonance of the magma dike feeding the eruption. The evolution of the resonance period reveals a shortening of the dike when the magma flux decreases at the end of the eruption. VLP events are actually quite frequent at Piton de la Fournaise: all eruptions analyzed in this study exhibit VLP signals that are indicative of rapid drops in lava discharge. This work encourages the detection of VLP signals to monitor changes in magma flow during volcanic eruptions, and anticipate the corresponding evolution in effusive activity.
DOI
https://doi.org/10.31223/X50H3Q
Subjects
Physical Sciences and Mathematics
Keywords
volcano seismology, Piton de la Fournaise, VLP events, dike geometry
Dates
Published: 2023-09-02 00:44
Last Updated: 2023-09-02 07:44
License
CC BY Attribution 4.0 International
Additional Metadata
Conflict of interest statement:
None
Data Availability (Reason not available):
Data used in this study is freely available through the VOLOBSIS (http://volobsis.ipgp.fr) and RESIF data portals (http://resif.fr).
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