Imperial College London
Alternate

ProfessorJoannaMorgan

Faculty of Engineering, Department of Earth Science & Engineering

Emeritus Professor of Geophysics
 
 
 
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Contact

 

+44 (0)20 7594 6423j.v.morgan

 
 
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Location

 

1.46CRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Paulatto:2019:10.1029/2019JB018476,
author = {Paulatto, M and Moorkamp, M and Hautmann, S and Hooft, E and Morgan, J and Sparks, S},
doi = {10.1029/2019JB018476},
journal = {Journal of Geophysical Research. Solid Earth},
pages = {11170--11191},
title = {Vertically extensive magma reservoir revealed from joint inversion and quantitative interpretation of seismic and gravity data},
url = {http://dx.doi.org/10.1029/2019JB018476},
volume = {124},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Recent advances in our understanding of arc magmatic systems indicate that melt is stored for long periods in lowmelt fraction crystal mushes and that eruptible magma reservoirs are shortlived and are assembled rapidly by buoyancyinduced instabilities and draining of the crystal mush. Many aspects of their architecture remain unclear, particularly in relation to their geometry and shallow melt distribution. We investigate the storage of melt below the active Soufrière Hills Volcano (SHV), Montserrat, using joint geophysical inversion combined with a quantitative interpretation approach based on rock physics. We jointly inverted activesource Pwave traveltimes and gravity anomalies to derive coincident 3D models of Pwave velocity and density to a depth of 8 km. Comparative analysis of the active SHV and extinct Centre Hills volcano and effective elastic medium computations allow us to constrain temperature, melt fraction, and melt geometry. A continuous column of partial melt is inferred beneath SHV, at 4–8 km depth. Melt fraction is ~6% (ranging from 3 to 13% depending on melt geometry) and is maximum at 5–6 km depth. When underrecovery of the lowvP volume is taken into account, the melt fraction is revised to ~17% (ranging from 11 to 28%). Analysis of vP/density cross plots indicates that the melt distribution is best represented by lowaspect ratio geometries. These likely span a multiscale spectrum ranging from grainscale inclusions and fractures to 100mscale dykes and sills. Our results confirm the concept of vertically extensive crystal mush including one or multiple more meltrich layers.
AU  - Paulatto,M
AU  - Moorkamp,M
AU  - Hautmann,S
AU  - Hooft,E
AU  - Morgan,J
AU  - Sparks,S
DO  - 10.1029/2019JB018476
EP  - 11191
PY  - 2019///
SN  - 2169-9356
SP  - 11170
TI  - Vertically extensive magma reservoir revealed from joint inversion and quantitative interpretation of seismic and gravity data
T2  - Journal of Geophysical Research. Solid Earth
UR  - http://dx.doi.org/10.1029/2019JB018476
UR  - https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JB018476
UR  - http://hdl.handle.net/10044/1/75396
VL  - 124
ER  -
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