Abstract
Seismic interferometry is a recently developed theory that allows
for the recovery of a medium's impulse response between two points
should randomly distributed sources of white noise, or equivalently,
a multiply scattered equipartioned wavefield, be present throughout
the medium. We exploit the extremely scattering nature of volcanic
media and seismic illumination from impulsive Strombolian eruptions
to extract single-station body wave Green's tensors at an unusually
dense array of stations on Erebus volcano, Antarctica. We optimally
rotate these Green's tensors for each notable arrival and back project
them to construct a 3-dimensional scattering map of the magma-filled
volcano conduit system, also corroborated by an independent active
source tomography experiment using the same station distribution.
This approach not only favors highly scattering media, contrarily
to most conventional methods, but its passive nature (i.e. non-anthropogenic
sources) allows for studies of structural temporal variability, and
possible extension into real-time monitoring of active volcanoes.
Users
Please
log in to take part in the discussion (add own reviews or comments).