Seismicity of continental Alaska

Page, Robert A.; Biswas, N. N.; Lahr, John C.; Pulpan, Hans

doi:10.1130/dnag-csms-neo.47

Cited by 51 publications

(34 citation statements)

References 72 publications

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“…The granodiorites range in age from 89-78 Ma in the Yukon-Koyukuk basin 2 . Seismic activity in the region is documented with the Kobuk fault to the north having a 4.6M earthquake in 1980 3 . No structural control of the hot springs had been mapped previous to this field exercise.…”

Section: Geologic Backgroundmentioning

confidence: 99%

NANA Geothermal Assessment Program Final Report

Hermanson¹

2010

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Section: Geologic Backgroundmentioning

confidence: 99%

NANA Geothermal Assessment Program Final Report

Hermanson¹

2010

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“…1.1). The paucity of earthquakes along the section of the Denali fault adjacent to the Wrangell Mountains suggests that the eastern section of the fault is relatively inactive (Page et al, 1991;Matmon et al, 2006). The Totschunda and Fairweather faults instead accommodate a large component of right-lateral motion.…”

Section: Regional Tectonic Frameworkmentioning

confidence: 99%

“…The eastern region of the tectonic transition zone displays active volcanism in the Wrangell arc, shallow seismicity (<50 km), and displacement along the Denali-Duke River, Totschunda, and Fairweather right-lateral strike-slip fault systems (Page et al, 1991;EberhartPhillips et al, 2003;Preece and Hart, 2004;Qi et al, 2007;Benowitz et al, 2011) (Fig. 1.1).…”

Section: Regional Tectonic Frameworkmentioning

confidence: 99%

Initiation of the Wrangell Arc: A Record of Tectonic Changes in an Arc-Transform Junction Revealed by New Geochemistry and Geochronology of the ~29–18 Ma Sonya Creek Volcanic Field, Alaska

Berkelhammer¹

2017

Geological Society of America Abstracts With Programs

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The Sonya Creek volcanic field (SCVF) contains the oldest in situ magmatic products in the ~29 Ma-modern Wrangell arc (WA) in south-central Alaska. The WA is located within a transition zone between Aleutian subduction to the west and dextral strike-slip tectonics along the Queen Charlotte-Fairweather and Denali-Duke River fault systems to the east. WA magmatism is due to the shallow subduction (11-16°) WA, and no alkaline lavas that characterize the ~18-10 Ma Yukon WA are present. Sr-Nd-Pb-Hf radiogenic isotope data suggest the SCVF data were generated by contamination of a depleted mantle wedge by ~0.2-4% subducted terrigenous sediment, agreeing with geologic evidence from many places along the southern Alaskan margin. Our combined dataset reveals geochemical and spatial transitions through the lifetime of the SCVF, which record changing tectonic processes during the early evolution of the WA. The earliest SCVF phases suggest the initiation of Yakutat microplate subduction. Early SCVF igneous rocks are also chemically similar to hypabyssal intrusive rocks of similar ages that crop out to the west; together these ~29-20 Ma rocks imply that WA initiation occurred over a <100 km belt, ~50-60 km inboard from the modern WA and current loci of arc magmatism that extends from Mt. Drum to Mt.Churchill.iv

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“…Passage Canal is located near a plate boundary, where the Pacific and North American plates converge along the Aleutian Megathrust (DeMets et al, 1990;Page et al, 1991). According to the segmentation model of Nishenko and Jacob (1990), southcentral Alaska includes three segments of the megathrust: the Yakataga-Yakutat (YY), Prince William Sound (PWS), and Kodiak Island (KI) segments, shown in Fig.…”

Section: Tectonic Tsunami Hazardmentioning

confidence: 99%

Numerical modeling of the 1964 Alaska tsunami in western Passage Canal and Whittier, Alaska

Nicolsky

Suleimani

Hansen

2010

Nat. Hazards Earth Syst. Sci.

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Abstract.A numerical model of the wave dynamics in Passage Canal, Alaska during the M w 9.2 megathrust earthquake is presented. During the earthquake, several types of waves were identified at the city of Whittier, located at the head of Passage Canal. The first wave is thought to have been a seiche, while the other two waves were probably triggered by submarine landslides. We model the seiche wave, landslide-generated tsunami, and tectonic tsunami in Passage Canal and compute inundation by each type of wave during the 1964 event. Modeled results are compared with eyewitness reports and an observed inundation line.

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Seismicity of continental Alaska

Cited by 51 publications

References 72 publications

NANA Geothermal Assessment Program Final Report

NANA Geothermal Assessment Program Final Report

Initiation of the Wrangell Arc: A Record of Tectonic Changes in an Arc-Transform Junction Revealed by New Geochemistry and Geochronology of the ~29–18 Ma Sonya Creek Volcanic Field, Alaska

Numerical modeling of the 1964 Alaska tsunami in western Passage Canal and Whittier, Alaska

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