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Umnak Island

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Journal Article
Published: 01 February 1984
Canadian Journal of Earth Sciences (1984) 21 (2): 171-180.
...Hugh McLean; J. R. Hein Abstract The rocks of southwestern Umnak Island (Nikolski area) consist mainly of a slightly deformed marine sedimentary sequence intruded by hypabyssal quartz diorite sills and small plutons. Laminated and thin-bedded argillaceous and tuffaceous mudstone and siltstone...
Journal Article
Journal: GSA Bulletin
Published: 16 November 2019
GSA Bulletin (2019) 131 (5-6): 707-729.
...Rob Witter; Rich Briggs; Simon E. Engelhart; Guy Gelfenbaum; Rich D. Koehler; Alan Nelson; SeanPaul La Selle; Reide Corbett; Kristi Wallace Abstract At the eastern end of the 1957 Andreanof Islands, Alaska, USA, moment magnitude 8.6 earthquake rupture, Driftwood Bay (Umnak Island) and Stardust Bay...
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(A) Location of Okmok volcano on <b>Umnak</b> <b>Island</b> in central Aleutian <b>Islands</b>. ...
Published: 01 May 2016
Figure 1. (A) Location of Okmok volcano on Umnak Island in central Aleutian Islands. (B) Digital elevation map of Okmok caldera with locations of several features related to the 2008 eruption. (C) Photo of the vent area of the Okmok 2008 eruption, from the north. Vent localities are denoted
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Tectonic setting of the Aleutian subduction zone. (A) Near <b>Umnak</b> <b>Island</b>, Al...
Published: 16 November 2019
Figure 1. Tectonic setting of the Aleutian subduction zone. (A) Near Umnak Island, Alaska, USA, the Pacific Plate is subducting beneath North America at 70 mm/yr ( Argus et al., 2010 ). Violet areas outline aftershocks following twentieth century megathrust earthquakes ( Sykes et al., 1980
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ATTRIBUTES OF SAND SHEETS AND TEPHRAS, DRIFTWOOD BAY, <b>UMNAK</b> <b>ISLAND</b>, ALASKA,...
Published: 16 November 2019
TABLE 4. ATTRIBUTES OF SAND SHEETS AND TEPHRAS, DRIFTWOOD BAY, UMNAK ISLAND, ALASKA, USA
Journal Article
Journal: GSA Bulletin
Published: 01 January 1961
GSA Bulletin (1961) 72 (1): 93-128.
...F. M BYERS, JR. Abstract This paper tentatively relates the comparative petrology and chemistry of three volcanic suites on Umnak and Bogoslof islands in the eastern part of the Aleutian Island arc to tectonic position with respect to the axis of the arc. Umnak is a large geologically complex...
Journal Article
Journal: GSA Bulletin
Published: 01 May 2016
GSA Bulletin (2016) 128 (5-6): 792-806.
...Figure 1. (A) Location of Okmok volcano on Umnak Island in central Aleutian Islands. (B) Digital elevation map of Okmok caldera with locations of several features related to the 2008 eruption. (C) Photo of the vent area of the Okmok 2008 eruption, from the north. Vent localities are denoted...
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Series: AAPG Memoir
Published: 01 January 1976
EISBN: 9781629812113
... and Geyser Spring Basin and Okmok caldera on Umnak Island in the Aleutian Islands (Fig. 1)—have been classified as "Known Geothermal Resource Areas" (KGRA's) by the U.S. Geological Survey (Godwin et al, 1971). In addition, about 75 known thermal springs and volcanic areas have been classified as having...
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1968
AAPG Bulletin (1968) 52 (3): 566-567.
...) intrashelf basins, (2) an outer-shelf sediment-draped basement high, and (3) a continental borderland, Umnak Plateau, seaward from the continental slope. Although the possibility of subshelf oil deposits has long been recognized in the thick sequence of Cenozoic sediments underlying Bristol Bay, published...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1970
AAPG Bulletin (1970) 54 (9): 1644-1650.
... leading to the plateau from the submerged flank of Umnak Island, submarine erosion along Umnak and Inanudak Canyons has separated the plateau from the northern flank of the Aleutian Ridge ( Fig. 1 ). On the west a gently inclined (2–3°) marginal slope leads from the plateau’s seaward edge to the abyssal...
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Journal Article
Journal: AAPG Bulletin
Published: 01 March 1970
AAPG Bulletin (1970) 54 (3): 555-556.
...David W. Scholl; Michael S. Marlow Abstract Four diapiric folds and two folds that are probably diapiric have been located by seismic-reflection profiling beneath the edges of Umnak Plateau, a broad platform at a depth of about 1,860 m in the southeastern corner of the Bering Sea. The plateau...
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Schematic map of the Aleutian <b>island</b> arc and representative models for the ...
in > Geology
Published: 01 July 2010
the element size and environment near the slab surface. The locations of Adak and Umnak islands are represented by the filled and open stars, respectively.
Journal Article
Published: 01 January 2012
Seismological Research Letters (2012) 83 (1): 29-38.
... modeling of 3.3 m of slip on a 100 × 75 km subfault southwest of Umnak Island. The length of the segment ends in the east at the rupture zone of the 1946 earthquake. *** Using relocated first-day aftershocks of Boyd et al. ( 1995 ), Henry and Das ( 2001 ) estimate a fault width of 90 km...
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Journal Article
Journal: AAPG Bulletin
Published: 01 February 1976
AAPG Bulletin (1976) 60 (2): 161-183.
...Michael S. Marlow; David W. Scholl; Alan K. Cooper; Edwin C. Buffington Abstract The virtually featureless Beringian shelf south of St. Lawrence Island is underlain structurally by at least 14 basins. Encompassing a total area of more than 300,000 sq km, most of the basins are either elongate...
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RADIOCARBON AGES AND CALIBRATED AGE RANGES FOR SEDIMENT FROM DRIFTWOOD BAY,...
Published: 16 November 2019
TABLE 2. RADIOCARBON AGES AND CALIBRATED AGE RANGES FOR SEDIMENT FROM DRIFTWOOD BAY, UMNAK ISLAND, ALASKA, USA
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SUMMARY OF AGES AND RECURRENCE INTERVALS FROM BAYESIAN AGE-DEPTH MODEL, DRI...
Published: 16 November 2019
TABLE 3. SUMMARY OF AGES AND RECURRENCE INTERVALS FROM BAYESIAN AGE-DEPTH MODEL, DRIFTWOOD BAY, UMNAK ISLAND, ALASKA, USA
Journal Article
Published: 01 April 1986
Bulletin of the Seismological Society of America (1986) 76 (2): 463-481.
... with the 1957 ( M w = 9.1) Aleutian Island earthquke (abstract) , EOS 66 , 298 . Brune J. N. (1970) . Tectonic stress and the spectra of seismic shear waves from earthquakes , J. Geophys. Res. 75 , 4997 - 5009 . Byers F. M. (1959) . Geology of Umnak and Bogoslof...
Journal Article
Journal: GSA Bulletin
Published: 01 June 2002
GSA Bulletin (2002) 114 (6): 675-692.
... for research and monitoring surveys. The bathymetry and acoustic backscatter reveal the character of landforms and lead to a chronology for the concurrent filling of the lake and volcanism within the ca. 7700 calibrated yr B.P. caldera. The andesitic Wizard Island and central-platform volcanoes are composed...
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(A) Satellite image of the Cabin Flat locality on the northwestern shorelin...
Published: 16 November 2019
Figure 3. (A) Satellite image of the Cabin Flat locality on the northwestern shoreline of Driftwood Bay, Umnak Island, Alaska, USA. Image acquired on September 2015 (© 2015 DigitalGlobe, NextView License). (B) Topographic map of Cabin Flat locality showing locations of sediment cores, scarp
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Stratigraphic profile along transect 100 that shows interbedded sand sheets...
Published: 16 November 2019
Figure 4. Stratigraphic profile along transect 100 that shows interbedded sand sheets, tephra, and coastal sediment beneath Cabin Flat on the northwestern shoreline of Driftwood Bay, Umnak Island, Alaska, USA (location shown on Fig. 3 ). Elevation, shown in the vertical axis on the right