This doctoral thesis applies measurements of ground deformation from satellite radar using
their potential to play a key role in understanding volcanic and magmatic processes throughout
the eruption cycle. However making these measurements is often problematic and the processes
driving ground deformation are commonly poorly understood. These problems are approached in
this thesis in the context of the Cascades Volcanic Arc. From a technical perspective the
thesis develops a new way of using regional-scale weather models to assess a priori the
influence of atmospheric uncertainties on satellite measurements of volcano deformation
providing key parameters for volcano monitoring. Next it presents detailed geodetic studies of
two volcanoes in northern California: Medicine Lake Volcano and Lassen Volcanic Centre. Finally
the thesis combines geodetic constraints with petrological inputs to develop a thermal model of
cooling magma intrusions. The novelty and range of topics covered in this thesis mean that it
is a seminal work in volcanic and magmatic studies.
