Abstract
Accuracy of seismic phase observation and consistency of timing error
assessment define the quality of seismic waves arrival times. High-quality
and large data sets are prerequisites for seismic tomography to enhance
the resolution of crustal and upper mantle structures. In this paper
we present the application of an automated picking system to some
600 000 seismograms of local earthquakes routinely recorded and archived
by the Italian national seismic network. The system defines an observation
weighting scheme calibrated with a hand-picked data subset and mimics
the picking by an expert seismologist. The strength of this automatic
picking is that once it is tuned for observation quality assessment,
consistency of arrival times is strongly improved and errors are
independent of the amount of data to be picked. The application to
the Italian local seismicity documents that it is possible to automatically
compile a precise, homogeneous and large data set of local earthquake
Pg and Pn arrivals with related polarities. We demonstrate that such
a data set is suitable for high-precision earthquake location, focal
mechanism determination and high-resolution seismic tomography.
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