Abstract
This study combines migration and forward source modeling techniques
to examine the existence and location of persistent seismic noise
near southern Italy. Our results demonstrate that noise source modeling
is both feasible and recommended in validating the 'ambient source'
assumption prior to noise-based velocity analyses. Persistent noise
sources near the Gargano promontory and the Tyrrhenian Sea coast
are strongly suggested by the observed cross-correlations. The presence
of a single point source or a cluster of point sources could both
produce coherent Rayleigh wave energy in southern Italy. While the
nature of the noise sources is still uncertain, baroclinic estimates
and dynamic topography models favor an explanation that encompasses
atmosphere-ocean coupling and heightened wave interaction off the
Adriatic coast. Our records indicate that these noise sources can
maintain their average location for up to 7 months despite seasonal
and, possibly, daily variations.
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