Paleoseismicity and Neotectonics of the Aleutian Subduction Zone-An Overview

Carver, Gary A.; Plafker, George

doi:10.1029/179gm03

Cited by 67 publications

(148 citation statements)

References 55 publications

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“…In contrast to this record of just one period of ingression into the lower lake, to the east of Point Whitshed, peat horizons encountered more than 11 m below the lowest current elevation of peat formation imply net submergence in the Copper River Delta over the last 6000 years ( Figure 7) and provide records of coseismic uplift and interseismic subsidence over multiple earthquake deformation cycles (Carver and Plafker, 2008;Plafker et al, 1992).…”

Section: Integrating Contributions To Rsl Changementioning

confidence: 96%

“…We add an earthquake cycle influence to our model, basing the intervals on observations of regional patterns (Carver and Plafker, 2008;Shennan et al, 2014), assuming ~1.5m coseismic uplift, as in 1964 (Plafker, 1969), ~30% recovery since then and no net tectonic motion over multiple cycles (RSL 2 in Figure 8). …”

Section: Multiple Earthquake Deformation Cyclesmentioning

confidence: 99%

“…We conclude with a model to demonstrate the interactions of processes that contribute to land surface deformation and relative sea--level change. Here, the subducting Yakutat microplate underthrusts the North American plate and is itself underthrust by the Pacific plate (Freymueller et al, 2008;Fuis et al, 2008), which moves approximately northward at ~55 mm yr --1 . Large to great (Mw > 8) earthquakes on any part of the active interfaces may result in sudden surface deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Plafker (1969) estimates coseismic uplift at Point Whitshed of 1.7 m, from raised barnacles, and ~1.9 m at the Cordova tide gauge, ~13 km to the northeast. Paleoseismic investigations record ten great earthquakes in the last 5000 years at sites in the Copper River Delta (Carver and Plafker, 2008;Plafker et al, 1992;Shennan et al, 2014), a likely consequence of rupturing of one or more segments of the Alaska--Aleutian megathrust ).…”

Section: Introductionmentioning

confidence: 99%

“…Rapid exhumation, erosion through multiple glacial cycles, tectonics and fault alignments interact over million--year timeframes (e.g. Enkelmann et al, 2008); ice streams that reached the edge of the continental shelf at the Last Glacial Maximum, 22--20,000 yr BP (Molnia and Post, 1995), had retreated to inland of the present coast, and in some cases well inside their present extent by ~15,000 yr BP (Pasch et al, 2010); the sediment load of the Copper River, ~70 -140 x 10 6 tons yr --1 , is one of the 20 largest in the world (Jaeger et al, 1998;Milliman and Syvistski, 1992); and sediment sequences in the Copper River Delta provide one of the best archives of megathrust earthquakes, ten in the past 6000 years (Carver and Plafker, 2008), including the Mw 9.2 earthquake of March 1964. Lateral variations in lithospheric and upper mantle properties in this plate boundary location mean that the parameters of global glacial isostatic adjustment (GIA) models may give poor estimates of millennial--scale changes in relative sea level (RSL) and shorter term glacier fluctuations during the Little Ice Age may dominate present patterns of vertical land deformation (James et al, 2009a, b;Larsen et al, 2005;Sauber et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Constraints on regional drivers of relative sea-level change around Cordova, Alaska

Garrett

Barlow

Cool

et al. 2015

Quaternary Science Reviews

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(2015) 'Constraints on regional drivers of relative sea-level change around Cordova, Alaska.', Quaternary science reviews., 113 . pp. 48-59. Further information on publisher's website:http://dx.doi.org/10. 1016/j.quascirev.2014.12.002 Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Quaternary Science Reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Quaternary Science Reviews, 113, 1 April 2015, 10.1016/j.quascirev.2014 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Section: Integrating Contributions To Rsl Changementioning

confidence: 96%

Section: Multiple Earthquake Deformation Cyclesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Constraints on regional drivers of relative sea-level change around Cordova, Alaska

Garrett

Barlow

Cool

et al. 2015

Quaternary Science Reviews

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Uplift and subsidence reveal a nonpersistent megathrust rupture boundary (Sitkinak Island, Alaska)

Briggs

Engelhart

Nelson

et al. 2014

Geophys. Res. Lett.

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Probing the transition between seismically coupled and decoupled segments along an ancient subduction interface

Angiboust

Kirsch

Oncken

et al. 2015

Geochem Geophys Geosyst

100

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The transition zone at the downdip end of seismic coupling along subduction interfaces is often the site of megathrust earthquake nucleation and concentrated postseismic afterslip, as well as the focus site of episodic tremor and slip features. Exhumed remnants of the former Alpine subduction zone found in the Swiss Alps allow analyzing fluid and deformation processes near the transition zone region (30-40 km paleodepth). The Dent Blanche Thrust (DBT) is a lower blueschist-facies shear zone interpreted as a fossilized subduction interface where granitic mylonites overlie a metamorphosed accretionary wedge. We report field observations from the DBT region where multiple, several tens of meters thick foliated cataclastic networks are interlayered within the basal DBT mylonites. Petrological results and microstructural observations indicate that the various cataclasis events took place at near-peak metamorphic conditions (400-5008C, 1.1-1.3 GPa) during subduction of the Tethyan seafloor in Eocene times (42-48 Ma). Some of these networks exhibit mutual crosscutting relationships between mylonites, foliated cataclasites, and vein systems indicating mutual overprinting between brittle deformation and ductile creep. Whole-rock chemical compositions, in situ 40 Ar age data of recrystallized phengite, and Sr isotopic signatures reveal that DBT rocks also underwent multiple hydrofracturing and metasomatic events via the infiltration of fluids mainly derived from the oceanic metasediments underneath the DBT. From the rock fabrics, we infer strain rate fluctuations of several orders of magnitude beyond subduction strain rates (10 212 s 21) accompanied by fluctuation of supralithostatic and quasi-lithostatic fluid pressures (1 k > 0.95). DBT brittle-plastic deformation switches highlight the diversity of deformation processes and fluid-rock interactions in the transition zone region of the subduction interface.

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Paleoseismicity and Neotectonics of the Aleutian Subduction Zone-An Overview

Cited by 67 publications

References 55 publications

Constraints on regional drivers of relative sea-level change around Cordova, Alaska

Constraints on regional drivers of relative sea-level change around Cordova, Alaska

Uplift and subsidence reveal a nonpersistent megathrust rupture boundary (Sitkinak Island, Alaska)

Probing the transition between seismically coupled and decoupled segments along an ancient subduction interface

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