TY - JOUR
T1 - Magma storage and diking revealed by GPS and InSAR geodesy at Pacaya volcano, Guatemala
AU - Lechner, Hans N.
AU - Wauthier, Christelle
AU - Waite, Gregory P.
AU - Escobar-Wolf, Rudiger
N1 - Funding Information:
We thank Dr. Chuck Demets at UW Madison for the advice on GPS, Dr. Peter LaFemina and Andres Gorki Ruiz Paspuel at Penn State for thoughtful discussions and GPS analysis, Brianna Hetland for collecting some of these data, INSIVUMEH, Park Police, and local guides in Guatemala for field support. The authors also thank the two anonymous reviewers and assistant editor Dr. Sylvie Vergniolle for their work and input to improve the quality of this manuscript.
Funding Information:
Funding information UNAVCO provided some equipment; Lechner was partially supported by UNAVCO/COCONet grant EAR-1042906 and NSF grants 0530109 and 1053794. Dr. Wauthier was supported by grants NNX17AD70G and NNX16AK87G issued through NASA’s Science Mission Directorates Earth Science Division.
Publisher Copyright:
© 2019, International Association of Volcanology & Chemistry of the Earth's Interior.
PY - 2019/3/1
Y1 - 2019/3/1
N2 - GPS measurements from a campaign network at Pacaya volcano, Guatemala, occupied from 2009 to 2015 were combined with InSAR data from 2013 to 2014 to model deformation sources for two eruptive time periods: 2009–2011 and 2013–2014. The GPS data for both of these time periods show downward vertical and outward horizontal deformation greater than 25 cm at several stations surrounding the volcano, while InSAR data shows up to 15-cm line-of-sight displacement. To better understand the dynamics of the magma storage system and sources of deformation, we inverted available geodetic data for these two periods. Our analytical modeling suggests that horizontal deformation was dominated by inflation of a shallow, subvertical dike, high within the volcanic edifice, while deflation of a deeper, spherical source embedded below the NW flank of the volcano occurred during at least part of the observation period. The source parameters for the dike feature are in good agreement with the observed alignment of recent eruptive vents, while parameters for the deeper, spherical source accommodate the downward vertical deformation observed at stations on and around the volcano.
AB - GPS measurements from a campaign network at Pacaya volcano, Guatemala, occupied from 2009 to 2015 were combined with InSAR data from 2013 to 2014 to model deformation sources for two eruptive time periods: 2009–2011 and 2013–2014. The GPS data for both of these time periods show downward vertical and outward horizontal deformation greater than 25 cm at several stations surrounding the volcano, while InSAR data shows up to 15-cm line-of-sight displacement. To better understand the dynamics of the magma storage system and sources of deformation, we inverted available geodetic data for these two periods. Our analytical modeling suggests that horizontal deformation was dominated by inflation of a shallow, subvertical dike, high within the volcanic edifice, while deflation of a deeper, spherical source embedded below the NW flank of the volcano occurred during at least part of the observation period. The source parameters for the dike feature are in good agreement with the observed alignment of recent eruptive vents, while parameters for the deeper, spherical source accommodate the downward vertical deformation observed at stations on and around the volcano.
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U2 - 10.1007/s00445-019-1277-x
DO - 10.1007/s00445-019-1277-x
M3 - Article
AN - SCOPUS:85062487112
SN - 0258-8900
VL - 81
JO - Bulletin of Volcanology
JF - Bulletin of Volcanology
IS - 3
M1 - 18
ER -