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Is a lowering of apparent velocity an indicator for rising magma in array seismology? 

Slowness
Phase velocity
Accretionary wedge
Surface wave
Diapir
Best insight from top research papers

A decrease in apparent velocity can indeed serve as an indicator of rising magma in array seismology. Studies have shown that significant velocity decreases were detected during swarm episodes associated with magma intrusion, with changes exceeding 0.3%. Additionally, the technique of coda wave interferometry has been utilized to identify velocity variations before volcanic eruptions, showcasing complex patterns of apparent velocity variations leading up to eruptions. These variations in seismic velocity have been linked to magmatic intrusions, stress field perturbations, and the migration of magma within volcanic structures. Therefore, monitoring apparent velocity changes through array seismology can provide valuable insights into the dynamics of magma movement and potential volcanic activity.

Answers from top 5 papers

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Papers (5)Insight
Open access•Journal Article•DOI
Shallow Low‐Velocity Layer in the Hyuga‐Nada Accretionary Prism and Its Hydrological Implications: Insights From a Passive Seismic Array
Takeshi Akuhara
01 Apr 2023-Journal Of Geophysical Research: Solid Earth
Not addressed in the paper.
Book Chapter•DOI
Array analysis of two-dimensional variations in surface wave phase velocity and azimuthal anisotropy in the presence of multipathing interference
Donald W. Forsyth, Aibing Li 
18 Mar 2013-Geophysical monograph
217 Citations
Not addressed in the paper.
Open access•Journal Article•DOI
Quantitative analysis of seismic wave propagation anomalies in azimuth and apparent slowness at Deception Island volcano (Antarctica) using seismic arrays
A. García Yeguas, Javier Almendros, Rafael Abella, Jesús M. Ibáñez 
01 Feb 2011-Geophysical Journal International
26 Citations
Yes, a lowering of apparent slowness in seismic arrays can indicate rising magma, as observed at Deception Island volcano, suggesting the presence of shallow magma chambers and rigid bodies.
Open access•Journal Article•DOI
Velocity variations associated with the large 2010 eruption of Merapi volcano, Java, retrieved from seismic multiplets and ambient noise cross-correlation
Agus Budi-Santoso, Philippe Lesage 
01 Jul 2016-Geophysical Journal International
37 Citations
Yes, a lowering of apparent velocity can indicate rising magma in array seismology, as observed before the 2010 eruption of Merapi volcano, Java, suggesting magma intrusion and potential volcanic activity.
Journal Article•DOI
Fractional seismic velocity change related to magma intrusions during earthquake swarms in the eastern Izu peninsula, central Japan
Tomotake Ueno, Tatsuhiko Saito, Katsuhiko Shiomi, Bogdan Enescu, Hitoshi Hirose, Kazushige Obara 
01 Dec 2012-Journal of Geophysical Research
27 Citations
Yes, a significant velocity decrease (>0.3%) detected during earthquake swarms in the eastern Izu peninsula indicates magma intrusion, reflecting strain changes in the crust.

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