Catalog of the historically active volcanoes of Alaska

Miller, Thomas P.; McGimsey, Robert G.; Richter, Donald H.; Riehle, J. R.; Nye, C. J.; Yount, Michael; Dumoulin, Julie A.

doi:10.3133/ofr98582

Cited by 168 publications

(229 citation statements)

References 30 publications

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“…However, active fumaroles near the summit inspire a continuing series of eruption reports dating back to 1867 (Coats, 1950;Miller and others, 1998). The most recent eruption has been dated at about 300 years BP (Beget, 1996).…”

Section: Eruption Historymentioning

confidence: 99%

Perennial snow and ice volumes on Iliamna Volcano, Alaska, estimated with ice radar and volume modeling

Trabant¹

1999

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Section: Eruption Historymentioning

confidence: 99%

Perennial snow and ice volumes on Iliamna Volcano, Alaska, estimated with ice radar and volume modeling

Trabant¹

1999

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“…The sketchy historical record dates back to 1817. Eruptions in this century happened in 1931, 1.936, 1938,1943,1945,1958,1960,1981,1983,1986,1988, and 1997 [Byers, 1959;Miller et aL, 1998]. All historical eruptions of Okmok originated from Cone A, located on the southern caldera rim, and produced abundant ash emissions and mafic lava flows on the caldera floor (Figure lb).…”

Section: Introductionmentioning

confidence: 99%

“…Massonnet et al [1995] [ Byers, 1959;Miller et aL, 1998]. Several major eruptions and a number of minor events occurred in the caldera in historical time.…”

Section: Introductionmentioning

confidence: 99%

Synthetic aperture radar interferometry of Okmok volcano, Alaska: Radar observations

Lü¹,

Mann²,

Freymueller³

et al. 2000

J. Geophys. Res.

106

111

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Abstract. ERS-1/ERS-2 synthetic aperture radar interferometry was used to study the 1997 eruption of Okmok volcano in Alaska. First, we derived an accurate digital elevation model (DEM) using a tandem ERS-1/ERS-2 image pair and the preexisting DEM. Second, by studying changes in interferometric coherence we found that the newly erupted lava lost radar coherence for 5-17 months after the eruption. This suggests changes in the surface backscattering characteristics and was probably related to cooling and compaction processes. Third, the atmospheric delay anomalies in the deformation interferograms were quantitatively assessed. Atmospheric delay anomalies in some of the interferograms were significant and consistently smaller than one to two fringes in magnitude. For this reason, repeat observations are important to confidently interpret small geophysical signals related to volcanic activities. Finally, using two-pass differential interferometry, we analyzed the preeruptive inflation, coeruptive deflation, and posteruptive inflation and confirmed the observations using independent image pairs. We observed more than 140 cm of subsidence associated with the 1997 eruption. This subsidence occurred between 16 months before the eruption and 5 months after the eruption, was preceded by-•18 cm of uplift between 1992 and 1995 centered in the same location, and was followed by •10 cm of uplift between September 1997 and 1998. The best fitting model suggests the magma reservoir resided at 2.7 km depth beneath the center of the caldera, which was -5 km from the eruptive vent. We estimated the volume of the erupted material to be 0.055 km 3 and the average thickness of the erupted lava to be---7.4 m.

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“…This gray lens structure finally fades away at a distance of about 15 km from the lake. Zoned ignimbrites grading from silicic at the base to mafic at the top are common and have been well documented at Crater Lake (Bacon, 1983) and in the Aniakchak ignimbrites (Miller et al, 1998). Such zonation is thought to reflect density stratification in the magma chamber (Cas and Wright, 1987).…”

Section: Unit Iii: Ko Ignimbritementioning

confidence: 99%

The 7600 (14C) year BP Kurile Lake caldera-forming eruption, Kamchatka, Russia: stratigraphy and field relationships

Пономарева

Kyle

Мелекесцев

et al. 2004

Journal of Volcanology and Geothermal Research

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The 7600 14 C-year-old Kurile Lake caldera-forming eruption (KO) in southern Kamchatka, Russia, produced a 7-km-wide caldera now mostly filled by the Kurile Lake. The KO eruption has a conservatively estimated tephra volume of 140 -170 km 3 making it the largest Holocene eruption in the Kurile -Kamchatka volcanic arc and ranking it among the Earth's largest Holocene explosive eruptions. The eruptive sequence consists of three main units: (I) initial phreatoplinian deposits; (II) plinian fall deposits, and (III) a voluminous and extensive ignimbrite sheet and accompanying surge beds and co-ignimbrite fallout. The KO fall tephra was dispersed over an area of >3 million km 2 , mostly in a northwest direction. It is a valuable stratigraphic marker for southern Kamchatka, the Sea of Okhotsk, and a large part of the Asia mainland, where it has been identified as a f 6 to 0.1 cm thick layer in terrestrial and lake sediments, 1000 -1700 km from source. The ignimbrite, which constitutes a significant volume of the KO deposits, extends to the Sea of Okhotsk and the Pacific Ocean on either side of the peninsula, a distance of over 50 km from source. Fine co-ignimbrite ash was likely formed when the ignimbrite entered the sea and could account for the wide dispersal of the KO fall unit. Individual pumice clasts from the fall and surge deposits range from dacite to rhyolite, whereas pumice and scoria clasts in the ignimbrite range from basaltic andesite to rhyolite. Ignimbrite exposed west and south of the caldera is dominantly rhyolite, whereas north, east and southeast of the caldera it has a strong vertical compositional zonation from rhyolite at the base to basaltic andesite in the middle, and back to rhyolite at the top. Following the KO eruption, Iliinsky volcano formed within the northeastern part of the caldera producing basalt to dacite lavas and pyroclastic rocks compositionally related to the KO erupted products. Other post-caldera features include several extrusive domes, which form islands in Kurile Lake, submerged cinder cones and the huge silicic extrusive massif of Dikii Greben' volcano. D

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Catalog of the historically active volcanoes of Alaska

Cited by 168 publications

References 30 publications

Perennial snow and ice volumes on Iliamna Volcano, Alaska, estimated with ice radar and volume modeling

Perennial snow and ice volumes on Iliamna Volcano, Alaska, estimated with ice radar and volume modeling

Synthetic aperture radar interferometry of Okmok volcano, Alaska: Radar observations

The 7600 (14C) year BP Kurile Lake caldera-forming eruption, Kamchatka, Russia: stratigraphy and field relationships

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