Quaternary Faulting in the Eastern Alaska Range

Richter, Donald H.; Matson, Neal A.

doi:10.1130/0016-7606(1971)82[1529:qfitea]2.0.co;2

Cited by 90 publications

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“…Several places on the eastern section of the Denali system show Holocene displacement including the Totschunda Fault along which glacial features of Wisconsin age have been offset 110-350m (Richter and Matson 1971) and the Shakwak segment west of the Tetlin River where late Pleistocene features have been offset 87 m (Plafker et al 1977). Richter and Matson suggested that dextral offset of 9-10 km for major antecedent drainages has occurred since the middle Pleistocene, but reexamination of the evidence by Plafker et al…”

Section: Eastern Sectionmentioning

confidence: 97%

“…Estimates of average right-lateral Holocene slip rates range from about 1 cmlyear to about 3.5 cmlyear (Richter and Matson 1971 ;Page 1972;Hickman and Craddock 1973;Plafker et al 1977). The principal movement on the Denali system generally is considered to be horizontal, but vertical separations have been suggested for various parts of the fault system.…”

Section: Introductionmentioning

confidence: 96%

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Displacement history of the Denali fault system, Alaska and Canada

Lanphere¹

1978

Can. J. Earth Sci.

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The Densli Wult system, a major crustal break in ,Alaska and northwestern Canada, is characterized by horizontal movement although vertical separdtion has been suggested for parts of the system. Essentially all of the dextral displilcement on this structure apparently has occurred during the Tertiary and Quaternary. About 3.50 km of dextral displacenrent occurred hetween 55 and 38 Ma ago on the McKinley, Shakwak and Dallon segments and displacement there since 38 Ma ago cannot be more than about 40 km. Holocene displacement has taken place on the McKinley and Totschunda segments and the western part of the Shakwak segment; high microearthquake activity on the eastern pan of the Shakwak and Dalton segments has been cited as evidence that this part of the Denali system currently atso may be active. L e systeme de faille de Denali, une cassure majeure de la croiite en Alaskaet dans le nord-ouest du Canada, s e caracttrise par un dkplacement brizontaI bien qu'on ait suggLri une s5paration verticale pour cenaines parties du sysleme. Prariquement tout le d6placemeni A droite rur cette structure s'est produil apparemment eu cours tlu Tertiire et du Quatemaire. Environ 350 km de mouvement a droite s'est produit entre 55 et 38 Ma le tong des segments de McKinley, de Shakwak et d e Dalton, et Ie deplacement aux mernes endroits depuis 38 Mane p u t Gtre plus que 40 krn environ.Les dtplacements au cours de I'tiolocene se Font produits sur les segments de McKinley et de Tot~chunda er dans la partie ouest du segment de Shakwak; une activite microsismique intense dans la partieest des segments de Shakwak el de Dalton a 6tP citee comme preuve que cette partie du systtme de Denali pourrait encore ktre active de nos jours.Can. J. Earth SCI., 15,817-822 (1978) [Tradu~t par le journal]

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Section: Eastern Sectionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 96%

Displacement history of the Denali fault system, Alaska and Canada

Lanphere¹

1978

Can. J. Earth Sci.

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“…(2) Between the Border Ranges fault and the Hubbard and Totschunda faults is a terrane of compositionally diverse metavolcanic and metasedimentary rocks of late Paleozoic age. The rocks in general, are increasingly more schistose and metamorphosed towards the Border Ranges fault (MacKevett and Plafker, 1974;Campbell and Dodds, 1978;MacKevett, 1978;Plafker, unpublished data Richter and Matson, 1971). The thrust faults, sawteeth on upper plage, are after Plafker (1967).…”

Section: Geologic Settingmentioning

confidence: 99%

Interim report on the St. Elias, Alaska earthquake of 28 February 1979

Lahr¹,

Plafker²,

Stephens³

et al. 1979

Open-File Report

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“…During the Cretaceous, oblique-slip underthrusting may have occurred along the ancestral Denali fault, as interpreted partly from the history of metamorphism of rocks that make up the Yukon-Tanana terrane along the fault's north side (Nokleberg et al, 1994;Ridgway et al, 2002). Estimates of Quaternary movement on the Denali fault range from 1 to 6.5 km since early Wisconsin or Illinoisan time (Richter and Matson, 1971;Stout et al, 1973). Probable rates of Holocene movement average 1.5 cm per year .…”

Section: The Denali and Hines Creek Faultsmentioning

confidence: 99%

Geophysical Data Reveal the Crustal Structure of the Alaska Range Orogen within the Aftershock Zone of the Mw 7.9 Denali Fault Earthquake

Fisher

Ratchkovski

Nokleberg

et al. 2004

Bulletin of the Seismological Society of America

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Geophysical information, including deep-crustal seismic reflection, magnetotelluric (MT), gravity, and magnetic data, cross the aftershock zone of the 3 November 2002 M w 7.9 Denali fault earthquake. These data and aftershock seismicity, jointly interpreted, reveal the crustal structure of the right-lateral-slip Denali fault and the eastern Alaska Range orogen, as well as the relationship between this structure and seismicity. North of the Denali fault, strong seismic reflections from within the Alaska Range orogen show features that dip as steeply as 25Њ north and extend downward to depths between 20 and 25 km. These reflections reveal crustal structures, probably ductile shear zones, that most likely formed during the Late Cretaceous, but these structures appear to be inactive, having produced little seismicity during the past 20 years. Furthermore, seismic reflections mainly dip north, whereas alignments in aftershock hypocenters dip south. The Denali fault is nonreflective, but modeling of MT, gravity, and magnetic data suggests that the Denali fault dips steeply to vertically. However, in an alternative structural model, the Denali fault is defined by one of the reflection bands that dips to the north and flattens into the middle crust of the Alaska Range orogen. Modeling of MT data indicates a rock body, having low electrical resistivity (Ͼ10 X•m), that lies mainly at depths greater than 10 km, directly beneath aftershocks of the Denali fault earthquake. The maximum depth of aftershocks along the Denali fault is 10 km. This shallow depth may arise from a higher-than-normal geothermal gradient. Alternatively, the low electrical resistivity of deep rocks along the Denali fault may be associated with fluids that have weakened the lower crust and helped determine the depth extent of the aftershock zone.

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Quaternary Faulting in the Eastern Alaska Range

Cited by 90 publications

References 0 publications

Displacement history of the Denali fault system, Alaska and Canada

Displacement history of the Denali fault system, Alaska and Canada

Interim report on the St. Elias, Alaska earthquake of 28 February 1979

Geophysical Data Reveal the Crustal Structure of the Alaska Range Orogen within the Aftershock Zone of the Mw 7.9 Denali Fault Earthquake

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