Description: From Neal and others (2014): "A low-frequency event followed by a short-lived tremor-like signal was recorded January 15, 2010, on station ANPB. There were no other stations recording data to facilitate further analysis; winters are particularly hard on Aniakchak stations and by January 26, all seismic stations were offline. On July 7, after summer maintenance and repair, two stations (ANPB and ANPK) recorded an approximate 15-minute long swarm. Another brief sequence of low-frequency events was recorded on station ANON on August 7 from about 21:20 to 21:28 UTC. From about 21:28 to 21:35 UTC, a signal resembling tremor occurred, although it also could be interpreted as a series of closely spaced, low-frequency events. This signal was picked up by the other five stations in the Aniakchak network.
"On October 14 from about 22:29 to 22:39 UTC, another sequence of low-frequency events occurred in the Aniakchak area. Only one event could be located, about 6 km (4 mi) east-northeast of Vent Mountain, the most prominent intracaldera cone. Another similar although shallower (9.1 km or 5.6 mi), low-frequency sequence also occurred on October 19. This event was located about 2 km (1.2 mi) south-southeast of Vent Mountain with a local magnitude of 0.5.
"Cluster, low-frequency events occurred on November 5, December 16, and from December 22-24. These small, emergent events may have been related to ice processes in the vicinity of the seismic station (H. Buurman, University of Alaska, written commun., 2010)."