Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 220, Issue 1, Pages 501-507Publisher
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggz466
Keywords
Seismic interferometry; Wave propagation; Body waves; Surface waves
Categories
Funding
- French ANR grant T-ERC 2018 (FaultProbe)
- European Research Council [742335]
- F-IMAGE
- European Union's Horizon 2020 research and innovation program [776622]
- Japan Society for the Promotion of Science (JSPS)
- International Joint Graduate Program in Earth and Environmental Sciences (GPEES)
- [817803 FAULTSCAN]
- H2020 Societal Challenges Programme [776622] Funding Source: H2020 Societal Challenges Programme
- European Research Council (ERC) [742335] Funding Source: European Research Council (ERC)
Ask authors/readers for more resources
Monitoring temporal changes of volcanic interiors is important to understand magma, fluid pressurization and transport leading to eruptions. Noise-based passive seismic monitoring using coda wave interferometry is a powerful tool to detect and monitor very slight changes in the mechanical properties of volcanic edifices. However, the complexity of coda waves limits our ability to properly image localized changes in seismic properties within volcanic edifices. In this work, we apply a novel passive ballistic wave seismic monitoring approach to examine the active Piton de la Fournaise volcano (La Reunion island). Using noise correlations between two distant dense seismic arrays, we find a 2.4 per cent velocity increase and -0.6 per cent velocity decrease of Rayleigh waves at frequency bands of 0.5-1 and 1-3 Hz, respectively. We also observe a -2.2 per cent velocity decrease of refracted P waves at 550m depth at the 6-12 Hz band. We interpret the polarity differences of seismic velocity changes at different frequency bands and for different wave types as being due to strain change complexity at depth associated with subtle pressurization of the shallow magma reservoir. Our results show that velocity changes measured using ballistic waves provide complementary information to interpret temporal changes of the seismic properties within volcanic edifices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available