Abstract
Geophysical methods can be used to create images of the Earth's interior
that constitute snapshots at the moment of data acquisition. In many
applications, it is important to measure the temporal change in the
subsurface, because the change is associated with deformation, fluid
flow, temperature changes, or changes in material properties. We
present an overview of how noninvasive geophysical methods can be
used for this purpose. We focus on monitoring mechanical properties,
fluid transport, and biogeochemical processes, and present case studies
that illustrate the use of geophysical methods for detecting time-lapse
changes in associated properties.
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