Data Series 531
Between January 1 and December 31, 2009, the Alaska Volcano Observatory (AVO) located 8,829 earthquakes, of which 7,438 occurred within 20 kilometers of the 33 volcanoes with seismograph subnetworks. Monitoring highlights in 2009 include the eruption of Redoubt Volcano, as well as unrest at Okmok Caldera, Shishaldin Volcano, and Mount Veniaminof. Additionally severe seismograph subnetwork outages resulted in four volcanoes (Aniakchak, Fourpeaked, Korovin, and Veniaminof) being removed from the formal list of monitored volcanoes in late 2009. This catalog includes descriptions of: (1) locations of seismic instrumentation deployed during 2009; (2) earthquake detection, recording, analysis, and data archival systems; (3) seismic velocity models used for earthquake locations; (4) a summary of earthquakes located in 2009; and (5) an accompanying UNIX tar-file with a summary of earthquake origin times, hypocenters, magnitudes, phase arrival times, location quality statistics, daily station usage statistics, all files used to determine the earthquake locations in 2009, and a dataless SEED volume for the AVO seismograph network.
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Dixon, J.P., Stihler, S.D., Power, J.A., and Searcy, Cheryl, 2010, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2009: U.S. Geological Survey Data Series 531, 84 p.
Data Acquisition and Processing
Seismic Velocity Models
Appendix A. Maps of Monitored Volcanoes with Earthquake Hypocenters Calculated in 2009
Appendix B. Parameters for Alaska Volcano Observatory Seismograph Stations in 2009
Appendix C. Locations of the Alaska Volcano Observatory Seismograph Stations in 2009
Appendix D. Operational Status for Alaska Volcano Observatory Stations in 2009
Appendix E. Seismic Velocity Models Used in Locating the Earthquakes in 2009
Appendix F. Location of Volcanic Zones Modeled Using Multiple Cylinders
Appendix G. Previous Alaska Volcano Observatory Earthquake Catalogs
Appendix H. Selected Papers Published in 2009 Using Data Provided by Alaska Volcano Observatory