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Data Series 531

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Catalog of Earthquake Hypocenters at Alaskan Volcanoes: January 1 through December 31, 2009

By James P. Dixon, U.S. Geological Survey, Scott D. Stihler, University of Alaska Fairbanks, John A. Power, U.S. Geological Survey, and Cheryl K. Searcy, U.S. Geological Survey

ABSTRACT

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.

For additional information contact:
Director, Alaska Science Center
U.S. Geological Survey
4210 University Dr.
Anchorage, Alaska 99508-4650
http://alaska.usgs.gov

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Suggested citation:

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.


Contents

Abstract

Introduction

Instrumentation

Data Acquisition and Processing

Seismic Velocity Models

Seismicity

Summary

Acknowledgments

References Cited

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