Okmok caldera in the eastern Aleutian arc began to erupt on July 11, 2008. The eruption featured a series of large explosions and continuous explosive activity lasting several weeks. The eruption resulted in the formation of several new vents and formed a large new cone within the 10-km diamet...
In the meantime, the biggest news is stillthe eruptionof Okmok Caldera in Alaska. The latest news has theeruption still going strongand theUSGS predictingit will continues for potentially weeks to months. The eruption is apparently froma new venton the caldera floor as well. Looks like the cur...
Late Pleis- tocene and Holocene caldera-forming eruptions of Okmok Caldera, Aleutian Islands, Alaska. In: Eichelberger, J., Gordeev, E., Izbekov, P., Kasahara, M., Lees, J. (Eds.), Volcanism and Subduction: The Kamchatka Region: Geophysical Monograph 172. American Geophysical Union, pp...
Mount Okmok is the highest point on the rim of Okmok Caldera (Unmagim Anatuu in Aleut) on the northeastern part of Umnak Island in the eastern Aleutian Islands of Alaska, USA. This 5.8 mile (9.3 km) wide circular caldera truncates the top of a large shield volcano. A crater lake ...
We find that areas of low Qp are concentrated in the central to southwestern portion of the caldera and correspond fairly well with areas of low Vp. We interpret the deeper part of the low velocity anomaly (4–6 km depth) beneath the caldera as a magma body. This is consistent with ...
Alaska's Umnak Island in the Aleutians showing the huge, 10-km wide caldera (upper right) largely created by the 43 BCE Okmok II eruption at the dawn of the Roman Empire. Landsat-8 Operational Land Imager image from May 3, 2014. Credit: U.S. Geological Survey ...
Burgisser, A., 2005, Physical volcanology of the 2,050 BP caldera-forming eruption of Okmok volcano, Alaska: Bulletin of Volcanology, v. 67, p. 497-525, doi:10 .1007/s00445-004-0391-5.Burgisser A. Physical Volcanology of the 2 050 BP Caldera-Forming ...
This caldera is one of the most active in the Aleutian Arc, and is now the focus of international multidisciplinary studies. A synthesis of remotely sensed data (AirSAR, derived DEMs, Landsat MSS and ETM+ data, AVHRR, ERS, JERS, Radarsat) has given a sequence of events for the virtually...
Magnetotelluric Investigation of Melt Storage Beneath Okmok Caldera, AlaskaBennington, Ninfa
Notably, the largest decrease in relative velocity occurs along the intrastation path passing nearest to the center of the caldera. This observation, along with equal amplitude relative velocity decreases revealed via analysis of intracaldera autocorrelations, suggests that the inflation source may be ...