Scott D. Stihler John A. Power Matthew M. Haney Tom Parker Cheryl Searcy Stephanie Prejean James P. Dixon 2013 <p>Between January 1 and December 31, 2012, the Alaska Volcano Observatory located 4,787 earthquakes, of which 4,211 occurred within 20 kilometers of the 33 volcanoes monitored by a seismograph network. There was significant seismic activity at Iliamna, Kanaga, and Little Sitkin volcanoes in 2012. Instrumentation highlights for this year include the implementation of the Advanced National Seismic System Quake Monitoring System hardware and software in February 2012 and the continuation of the American Recovery and Reinvestment Act work in the summer of 2012. The operational highlight was the removal of Mount Wrangell from the list of monitored volcanoes. This catalog includes hypocenters, magnitudes, and statistics of the earthquakes located in 2012 with the station parameters, velocity models, and other files used to locate these earthquakes.</p> application/pdf 10.3133/ds789 en U.S. Geological Survey Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2012 reports