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Authors: Mele, F.* 
Bono, A.* 
Lauciani, V.* 
Mandiello, A.* 
Marcocci, C.* 
Pintore, S.* 
Quintiliani, M.* 
Scognamiglio, L.* 
Mazza, S.* 
Title: Tuning an Earthworm phase picker: some considerations on the pick_ew parameters
Issue Date: Oct-2010
Series/Report no.: Rapporti Tecnici INGV
Keywords: seismic signal recocnition
seismic phase picker
Subject Classification04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
Abstract: Although the Earthworm project started with the initial mission of replacing the old real time picker by Rex Allen, as developed by Jim Ellis [Allen, 1978; Allen, 1982; USGS et al., 2010], that picker is still in use in many networks. The name of the procedure that implements the Allen’s algorithm is pick_ew. Despite its long-lived use, configuring this picker still seems not so immediate and easy. We discuss here a few simple rules to define some of the numerous (18) parameters of pick_ew, interpreting their physical meaning.
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