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Catalog of Earthquake Hypocenters at Alaskan Volcanoes: January 1 Through December 31, 2008

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Catalog of Earthquake Hypocenters at Alaskan Volcanoes: January 1 Through December 31, 2008 Catalog of Earthquake Hypocenters at Alaskan Volcanoes: January 1 through December 31, 2008 Data Series 467 U.S. Department of the Interior U.S. Geological Survey Catalog of Earthquake Hypocenters at Alaskan Volcanoes: January 1 through December 31, 2008 By James P. Dixon, U.S. Geological Survey, and Scott D. Stihler, University of Alaska Fairbanks Data Series 467 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia: 2009 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS. For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Dixon, J.P., and Stihler, S.D., 2009, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2008: U.S. Geological Survey Data Series 467, 86 p. iii Contents Abstract ..........................................................................................................................................................1 Introduction.....................................................................................................................................................1 Instrumentation ..............................................................................................................................................2 Data Acquisition and Processing ................................................................................................................6 Seismic Velocity Models ..............................................................................................................................6 Seismicity ........................................................................................................................................................7 Summary........................................................................................................................................................10 Acknowledgments .......................................................................................................................................10 References Cited..........................................................................................................................................10 Appendix A. Maps of Monitored Volcanoes with Earthquake Hypocenters Calculated in 2008 ...13 Appendix B. Parameters for Alaska Volcano Observatory Seismograph Stations in 2008 ............45 Appendix C. Locations of the Alaska Volcano Observatory Seismograph Stations in 2008 ..........53 Appendix D. Operational Status for Alaska Volcano Observatory Stations in 2008 .......................69 Appendix E. Seismic Velocity Models Used in Locating the Earthquakes in 2008 ...........................75 Appendix F. Location of Volcanic Zones Modeled Using Multiple Cylinders....................................81 Appendix G. Previous Alaska Volcano Observatory Earthquake Catalogs ......................................83 Appendix H. Selected Papers Published in 2008 Using Alaska Volcano Observatory Data .........85 Figures Figure 1. Map showing location of volcanoes mentioned in this report …………………… 2 Figure 2. Log-log plot of representative displacement response curves for the short-period stations using a Mark Products L4 or L4-3D seismometer ………… 3 Figure 3. Log-log plot of representative displacement response curves for the short-period stations using a Mark Products L22 seismometer ………………… 4 Figure 4. Log-log plot of representative displacement response curves for the short-period stations using a Teledyne-Geotech S13 seismometer ……………… 4 Figure 5. Log-log plot of representative displacement response curves for the broadband stations using a Guralp CMG-40T seismometer ……………………… 5 Figure 6. Log-log plot of representative displacement response curves for the broadband stations using a Guralp CMG-6TD seismometer ……………………… 5 Figure 7. Map showing earthquakes located by AEIC associated with the Kasatochi eruption 9 Figure 8. Map showing the May 2, 2008 Mw=6.6 earthquake with aftershocks and triggered seismicity located by AEIC ……………………………………………… 9 iv Tables Table 1. Number of earthquakes located per year in the Alaska Volcano Observatory catalog ……………………………………………………………… 1 Table 2. Number of Alaska Volcano Observatory seismograph stations by type and year …………………………………………………………………………… 3 Table 3. Volcano subnetwork designators ………………………………………………… 7 Table 4. Alaska Volcano Observatory event description codes …………………………… 7 Table 5. Number of earthquakes located for each seismograph subnetwork in 2007 and 2008 within 20 km of the volcanic centers in each subnetwork ………… 8 Conversion Factors and Datum Conversion Factors Multiply By To obtain kilometer (km) 0.6214 mile (mi) meter (m) 3.281 foot (ft) Datum Horizontal coordinate information is referenced to North American Datum of 1927 (NAD 27). Catalog of Earthquake Hypocenters at Alaskan Volcanoes: January 1 through December 31, 2008 By James P. Dixon1 and Scott D. Stihler2 Abstract magnitudes, phase arrival times, location quality statistics, daily station usage statistics, and all HYPOELLIPSE (Lahr, 1999) files used to determine the earthquake locations in 2008 Between January 1 and December 31, 2008, the Alaska are included in a data supplement to this report. Volcano Observatory (AVO) located 7,097 earthquakes In 2008, the AVO located 7,097 earthquakes (table 1, of which 5,318 occurred within 20 kilometers of the 33 appendix A) and of these, 5,318 were located within 20 km volcanoes monitored by the AVO. Monitoring highlights in of the 33 volcanic centers monitored (fig. 1). Two volcanoes, 2008 include the eruptions of Okmok Caldera, and Kasatochi Little Sitkin Volcano and Mount Cerberus, the active vent on Volcano, as well as increased unrest at Mount Veniaminof and Semisopochnoi Island, have not been formally added to the Redoubt Volcano. This catalog includes descriptions of: (1) list of permanently monitored volcanoes in the AVO weekly locations of seismic instrumentation deployed during 2008; update. To be included in the list of monitored volcanoes (2) earthquake detection, recording, analysis, and data archival in the AVO weekly update, the seismic subnetwork on the systems; (3) seismic velocity models used for earthquake volcano must be in place long enough so that the background locations; (4) a summary of earthquakes located in 2008; seismicity is known, typically 6 months, and have no and (5) an accompanying UNIX tar-file with a summary of prolonged station outages that prevent AVO from locating earthquake origin times, hypocenters, magnitudes, phase earthquakes. Loss of data due to telemetry failures since their arrival times, location quality statistics, daily station usage installation has prevented Little Sitkin and Mount Cerberus statistics, and all files used to determine the earthquake from being added to list of permanently monitored volcanoes. locations in 2008. Table 1. Number of earthquakes located per year in the Alaska Introduction Volcano Observatory catalog. The Alaska Volcano Observatory (AVO), a cooperative Number of Volcanoes monitored program of the U.S. Geological Survey, the Geophysical Year earthquakes located by the AVO Institute at the University of Alaska Fairbanks, and the Alaska per year seismograph network Division of Geological and Geophysical Surveys, has installed 1989 911 4 and maintained seismic monitoring networks at historically 1990 3,285 4 active volcanoes in Alaska since AVO inception in 1988 1991 1,119 4 1992 2,184 4 (fig. 1). The primary objectives of the AVO seismic program 1993 697 4 are the real-time seismic monitoring of active, potentially 1994 441 4 hazardous, Alaskan volcanoes and the investigation of seismic 1995 850 4 processes associated with active volcanism. This catalog 1996 6,466 14 describes the location of seismic instrumentation deployed in 1997 2,930 17 the field, the earthquake detection, recording, analysis, and 1998 2,873 20 1999 2,769 22 data archival systems, the seismic velocity models used for 2000 1,551 22 earthquake locations, and a summary of earthquakes located 2001 1,427 23 in 2008. A summary of earthquake origin times, hypocenters, 2002 7,242 24 2003 3,911 27 2004 6,928 30 1 2005 9,012 32 U.S. Geological Survey - Alaska Science Center, 903 Koyukuk Drive, 2006 8,666 33 Fairbanks, AK 99775-7320 2007 6,664 33 2University of Alaska Fairbanks - Geophysical Institute, 903 Koyukuk 2008 7,097 33 Drive, Fairbanks, AK 99775-7320 2 Catalog of Earthquake Hypocenters at Alaskan Volcanoes: January 1 through December 31, 2008 U Canada 64 N n i t 2008 Fairbanks ed St Volcano monitored by real-time seismic network a and listed in the AVO weekly update. tes ALASKA Sourdough Volcano monitored by real-time seismic network Tolsona 1 and not yet added to the list in the AVO weekly Anchorage update. 60 N 2 3 8 Kenai 7 4 Volcano unmonitored by real-time
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