| Abstract: | Time reversal of seismic wavefields recorded at active
volcanoes may provide images of the source process for
long-period (LP) or volcanic tremor events directly,
independent of assumptions about extent, geometry and
mechanics of the source. Time reversal methods involve
propagating the original time series from many receiver
locations back into the medium. The reversed signals then
focus at their origin due to constructive interference,
elucidating the source location, extent and radiation
pattern. In practice, focusing may be blurred due to
inaccurate Earth models or sparse sampling of the
wavefield at the surface. Here, we investigate the
feasibility of this method for several synthetic volcanic
tremor sources and present a gallery of time reversal source
images. Wave propagation is computed numerically in a 2D
volcano model with realistic topography. Our results
indicate that time reversal may be applicable in volcanic
settings, possibly yielding new insights into volcanoseismic
LP or tremor sources. Citation: Lokmer, I., G. S.
O’Brien, D. Stich, and C. J. Bean (2009), Time reversal imaging
of synthetic volcanic tremor sources, Geophys. Res. Lett., 36,
L12308, doi:10.1029/2009GL038178. |
