PhasePApy: A Robust Pure Python Package for Automatic Identification of Seismic Phases

Research Article| August 31, 2016 PhasePApy: A Robust Pure Python Package for Automatic Identification of Seismic Phases Chen Chen; Chen Chen aConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019 U.S.A.c.chen@ou.edu Search for other works by this author on: GSW Google Scholar Austin A. Holland Austin A. Holland bAlbuquerque Seismological Laboratory, U.S. Geological Survey, PO Box 82010, Albuquerque, New Mexico 87198 U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Chen Chen aConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019 U.S.A.c.chen@ou.edu Austin A. Holland bAlbuquerque Seismological Laboratory, U.S. Geological Survey, PO Box 82010, Albuquerque, New Mexico 87198 U.S.A. Publisher: Seismological Society of America First Online: 14 Jul 2017 Online Issn: 1938-2057 Print Issn: 0895-0695 © 2016 by the Seismological Society of America Seismological Research Letters (2016) 87 (6): 1384–1396. https://doi.org/10.1785/0220160019 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Chen Chen, Austin A. Holland; PhasePApy: A Robust Pure Python Package for Automatic Identification of Seismic Phases. Seismological Research Letters 2016;; 87 (6): 1384–1396. doi: https://doi.org/10.1785/0220160019 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search ABSTRACT We developed a Python phase identification package: the PhasePApy for earthquake data processing and near‐real‐time monitoring. The package takes advantage of the growing number of Python libraries including Obspy. All the data formats supported by Obspy can be supported within the PhasePApy. The PhasePApy has two subpackages: the PhasePicker and the Associator, aiming to identify phase arrival onsets and associate them to phase types, respectively. The PhasePicker and the Associator can work jointly or separately. Three autopickers are implemented in the PhasePicker subpackage: the frequency‐band picker, the Akaike information criteria function derivative picker, and the kurtosis picker. All three autopickers identify picks with the same processing methods but different characteristic functions. The PhasePicker triggers the pick with a dynamic threshold and can declare a pick with false‐pick filtering. Also, the PhasePicker identifies a pick polarity and uncertainty for further seismological analysis, such as focal mechanism determination. Two associators are included in the Associator subpackage: the 1D Associator and 3D Associator, which assign phase types to picks that can best fit potential earthquakes by minimizing root mean square (rms) residuals of the misfits in distance and time, respectively. The Associator processes multiple picks from all channels at a seismic station and aggregates them to increase computational efficiencies. Both associators use travel‐time look up tables to determine the best estimation of the earthquake location and evaluate the phase type for picks. The PhasePApy package has been used extensively for local and regional earthquakes and can work for active source experiments as well. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.