Characterizing the plumbing systems of active volcanoes through potential field studies

Date created: 
2010-11-16
Identifier: 
etd6331
Keywords: 
Volcano
Kĩlauea
Masaya
Three Sisters
Continuous gravity
Microgravity
Bouguer gravity
Total magnetic surveys
Magmatic plumbing systems
Mass flux
Abstract: 

The processes involved with mass transport through a volcanic plumbing system are poorly understood. Through the use of potential field studies, this thesis aims to identify volcanic structures, processes and Earth properties that control volcanic activity. Gravity and total magnetic surveys at Kĩlauea (Hawaii, USA), Masaya (Nicaragua) and South Sister (Oregon, USA) volcanoes, allowed for development of models to investigate magma transport at different spatial and temporal resolutions. At Kĩlauea rapid, short term mass flux perturbations were characterized within the shallow plumbing system and long term mass increases were inferred in the creation of a large intrusive complex. Constraints on crustal viscosity were obtained at South Sister through gravity and deformation models. At Masaya, constraints were obtained for void space in the active crater and shallow geologic properties. Potential field studies at active volcanoes can clearly bring insight into the fundamental processes of magma transport and emplacement.

Document type: 
Thesis
Rights: 
Copyright remains with the author. The author granted permission for the file to be printed, but not for the text to be copied and pasted.
File(s): 
Supervisor(s): 
Glyn Williams-Jones
Department: 
Science: Department of Earth Sciences
Thesis type: 
(Thesis) M.Sc.
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