Abstract
High-resolution seismic tomography at local and regional scales requires
large and consistent sets of arrival-time data. Algorithms combining
accurate picking with an automated quality classification can be
used for repicking waveforms and compiling large arrival-time data
sets suitable for tomographic inversion. S-wave velocities represent
a key parameter for petrological interpretation, improved hypocenter
determination, as well as for seismic hazard models. In our approach,
we combine three commonly used phase detection and picking methods
in a robust S-wave picking procedure. Information from the different
techniques provides an in situ estimate of timing uncertainty and
of the reliability of the automatic phase identification. Automatic
picks are compared against manually picked reference picks of selected
earthquakes in the Alpine region. The average accuracy of automatic
picks and their classification is comparable with the reference picks,
although a higher number of picks is downgraded to lower quality
classes by the automatic picker. In the production-mode, we apply
the picker to a data set of 552 earthquakes in the Alps recorded
at epicentral distances <150 km. The resulting data set includes
about 2500 S phases with an upper error bound of 0.27 sec. 10.1785/0120080019
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