Mark A. Bauer, G. L. Pavlis, M. Landes,
... Center to image the geometry of the subducting Yakutat Block in southeast Alaska. We combine results for ... system. We also locate the boundary between the Yakutat Block and North American Plate. We find direct evidence that the subducted Yakutat Block and Pacific plate slabs are continuous and that Yakutat Block subduction extends from Prince William Sound to ... data show a clear separation between the subducted Yakutat Block and the North American Plate under the ... of coupling between North America and the subducted Yakutat Block. This dip angle also places the subducted ...
Tópico(s): earthquake and tectonic studies
2014 - Geological Society of America | Geosphere
Donna Eberhart‐Phillips, Douglas H. Christensen, Thomas M. Brocher, R. A. Hansen, N. A. Ruppert, Peter J. Haeussler, G. A. Abers,
... mountain building and strike‐slip faulting, where the Yakutat terrane joins the subducting Pacific plate. The interplay ... partial melt. North of Cook Inlet, the subducted Yakutat slab is characterized by a thick low‐velocity, ... V s crust. High‐velocity material above the Yakutat slab may represent a residual older slab, which inhibits vertical flow of Yakutat subduction fluids. Alternate lateral flow allows Yakutat subduction fluids to contribute to Cook Inlet volcanism ... field. The apparent northeast edge of the subducted Yakutat slab is southwest of the Wrangell volcanics, which ...
Tópico(s): earthquake and tectonic studies
2006 - American Geophysical Union | Journal of Geophysical Research Atmospheres
Yakutat, situated about 360 km northwest of Juneau, Alaska, near the shore of the Gulf of Alaska, ... a setting that calls for superlatives.Within the Yakutat region are some of the tallest mountains, some ... probably took place 500 to 600 years ago.Yakutat is built upon the moderately steep moraine that ... of melting of one of these glaciers.Near Yakutat, surficial deposits may be more than 213 m ... and ground moraine deposits of the area.The Yakutat region is part of an active tectonic belt ... closest segment is about 53 km northeast of Yakutat.Movement along this fault caused the major earthquake ...
Tópico(s): Geotechnical and Geomechanical Engineering
1979 - United States Government Publishing Office | USGS professional paper
Gail Christeson, S. P. S. Gulick, Harm J. A. Van Avendonk, L. L. Worthington, R. Reece, Terry L. Pavlis,
... new constraints on the crustal structure of the Yakutat terrane and evidence of the role of the Transition fault in southern Alaska. The Yakutat terrane south of Yakutat Bay includes crystalline crust that is 24–27 ... are 4.5–7.5 km thick. The Yakutat terrane crustal thickness and velocity structure are consistent ... oceanic plateau origin. The southern edge of the Yakutat terrane is bounded by the Transition fault, which ... change in Moho depth from 32 km for Yakutat oceanic plateau crust to 11.5 km for ...
Tópico(s): Geological Studies and Exploration
2010 - Geological Society of America | Geology
Hilary J. Fletcher, J. T. Freymueller,
Global Positioning System (GPS) measurements were made at Yakutat, on the Yakutat terrane of southern Alaska, to investigate the motion of the Yakutat block with respect to the North American plate ... motion along the Fairweather fault. The velocity of Yakutat derived from the GPS data is 44.1 +/− ... azimuth of these two vectors. The motion of Yakutat relative to North America is almost exactly parallel ... Fairweather fault, suggesting that most deformation inboard of Yakutat is right‐lateral strike slip on the Fairweather ...
Tópico(s): Geological and Geochemical Analysis
1999 - American Geophysical Union | Geophysical Research Letters
... to flat slab subduction—and collision—of overthickened Yakutat crust. Because much of the Yakutat crust has been subducted, seismic imaging is needed ... isotropic model reveals several features: the subducting Pacific/Yakutat slab, slow wave speeds characterizing the onshore Yakutat collision zone, slow wave speeds of the Wrangell ... contrast at the eastern edge of the Pacific/Yakutat slab. We produce anisotropic phase velocity maps that ... anisotropy. These maps show the dominance of the Yakutat slab on the observed pattern of anisotropy. West ...
Tópico(s): Seismic Waves and Analysis
2014 - Wiley | Journal of Geophysical Research Solid Earth
Barbara L. Trüssel, R. J. Motyka, Martin Truffer, Christopher F. Larsen,
Abstract Both lake-calving Yakutat Glacier (337 km 2 ), Alaska, USA, and its parent icefield (810 km 2 ) are experiencing strong thinning, and under current ... disappear. Comparison of digital elevation models shows that Yakutat Glacier thinned at area-averaged rates of 4. ... w.e.a −1 (2007–10). Simultaneously, adjacent Yakutat Icefield land-terminating glaciers thinned at lower but ... lake-calving dynamics helps drive increased mass loss. Yakutat Glacier terminates into Harlequin Lake and for over ... rise. The post-Little Ice Age collapse of Yakutat Icefield was driven in part by tidewater calving ...
Tópico(s): Geology and Paleoclimatology Research
2013 - Cambridge University Press | Journal of Glaciology
... 01, 1983 Model for the origin of the Yakutat block, an accreting terrane in the northern Gulf ... R. Bruns; Model for the origin of the Yakutat block, an accreting terrane in the northern Gulf ... Abstract A composite oceanic and continental terrane, the Yakutat block, is currently colliding with and accreting to ... center that formed the basaltic basement of the Yakutat block was offset from a spreading center to ... northward movement of the composite terrane as the Yakutat block. During Eocene and Oligocene time, migration of ...
Tópico(s): Geological and Geophysical Studies
1983 - Geological Society of America | Geology
L. L. Worthington, Harm J. A. Van Avendonk, S. P. S. Gulick, Gail Christeson, Terry L. Pavlis,
... to constrain crustal thickness and composition of the Yakutat terrane in the northern Gulf of Alaska. The ... model shows that the crystalline crust composing the Yakutat terrane is wedge‐shaped, with crustal thickness increasing ... crustal velocities >7 km/s, suggesting that the Yakutat terrane is an oceanic plateau across its entire ... oceanic‐continental terrane as previously proposed. The thickest Yakutat crust is entering the adjacent St. Elias orogen ... in this vicinity are likely influenced by incipient Yakutat‐North America collision. Our model includes a ∼8 ...
Tópico(s): earthquake and tectonic studies
2011 - American Geophysical Union | Journal of Geophysical Research Atmospheres
S. P. S. Gulick, Lindsay Lowe, Terry L. Pavlis, James V. Gardner, Larry A. Mayer,
... debate: Propagating strike slip in response to stalling Yakutat block subduction in the Gulf of Alaska Sean ... debate: Propagating strike slip in response to stalling Yakutat block subduction in the Gulf of Alaska. Geology ... seismicity, current plate motions, and evidence that the Yakutat block may be anomalously thick, we propose a tectonic model for Yakutat-Pacific interactions, including the often-debated Transition fault. ... the 1987–1992 earthquake swarm, intersects the Pacific-Yakutat tectonic boundary. These fault patterns are consistent with ...
Tópico(s): High-pressure geophysics and materials
2007 - Geological Society of America | Geology
... Article| November 01, 1986 Eocene basalts from the Yakutat terrane: Evidence for the origin of an accreting ... S. Davis, George Plafker; Eocene basalts from the Yakutat terrane: Evidence for the origin of an accreting ... SocietyGeology Search Advanced Search Abstract Basalts from the Yakutat terrane, a composite oceanic and continental tectonostratigraphic terrane, ... southern Oregon Coast Range, are correlative with the Yakutat terrane basalts. Both basaltic sequences were accreted to ... Ridge and Kula plate about 48 Ma. The Yakutat basalts were emplaced along the coast of Washington ...
Tópico(s): Geological and Geochemical Analysis
1986 - Geological Society of America | Geology
Matthew E. Brueseke, Jeffrey A. Benowitz, Alexander T. Bearden, Michael Everett Mann, Daniel P. Miggins,
... debate on when the true collision of the Yakutat plateau began in Alaska. Three newly identified ca. ... orientation, nascent tear geochemical signatures, overlaying an imaged Yakutat slab tear, provide constraints on the timing of Yakutat collision and slab tearing. The ca. 1 Ma slab tear is coincident with Yakutat slab segmentation, northern continental Aleutian Arc rejuvenation, cessation ... Arc magmatism, increased collisional zone exhumation and eastern Yakutat trench abandonment. The documentation of nascent slab tear ...
Tópico(s): High-pressure geophysics and materials
2022 - Wiley | Terra Nova
R. Reece, S. P. S. Gulick, Gail Christeson, Brian K. Horton, Harm J. A. Van Avendonk, Ginger A. Barth,
... Alaska. We argue that farfield stress from the Yakutat Terrane collision with North America is the major ... motion vectors indicate that the Pacific plate and Yakutat Terrane are largely coupled along their boundary, the ... the Pacific Plate subduction angle shallows toward the Yakutat Terrane and supports the theory that the Pacific Plate and Yakutat Terrane maintain coupling along the subducted region of ... Plate motion during the late Miocene altered the Yakutat collision with North America, changing the stress transfer ...
Tópico(s): earthquake and tectonic studies
2013 - Wiley | Journal of Geophysical Research Solid Earth
Eva Enkelmann, Peter K. Zeitler, John I. Garver, Terry L. Pavlis, Benjamin P. Hooks,
... of exhumation and erosion processes at the ongoing Yakutat--North American collision in southeast Alaska. Many thermochronologic ... and eroded long before the late Miocene--Pliocene Yakutat collision, but since the beginning of the subduction of the Yakutat lithosphere in the Oligocene/early Miocene. Today there ... very rapid and deep-seated exhumation at the Yakutat plate corner (St. Elias syntaxis), where strike slip ... and eroded as a consequence of the continuing Yakutat collision. In general the thermochronology in southeast Alaska ...
Tópico(s): High-pressure geophysics and materials
2010 - Yale University | American Journal of Science
Ronald L. Bruhn, Terry L. Pavlis, George Plafker, Laura Serpa,
... mountains formed by collision and accretion of the Yakutat terrane into the transition zone from transform faulting ... that generate large- to great-magnitude earthquakes. The Yakutat terrane is a fragment of the North American ... continental margin of southern Alaska. Interaction between the Yakutat terrane and the North American and Pacific plates ... the orogen is marked by thrusting of the Yakutat terrane beneath the North American plate along the ... the orogen, where the sedimentary cover of the Yakutat terrane is accreted into the upper plate of ...
Tópico(s): Geological and Geochemical Analysis
2004 - Geological Society of America | Geological Society of America Bulletin
David J. Barclay, Parker E. Calkin, Gregory C. Wiles,
... 01, 2001 Holocene history of Hubbard Glacier in Yakutat Bay and Russell Fiord, southern Alaska David J. ... C. Wiles; Holocene history of Hubbard Glacier in Yakutat Bay and Russell Fiord, southern Alaska. GSA Bulletin ... with an ice lobe advancing through Disenchantment and Yakutat Bays in the west, and an eastern lobe ... the preceding two expansions. Late Holocene deglaciation of Yakutat and Disenchantment Bays was complete before A.D. ... to reach the area of the town of Yakutat, built on late Holocene glacial deposits, in the ...
Tópico(s): Climate change and permafrost
2001 - Geological Society of America | Geological Society of America Bulletin
Major structural features of the Yakutat segment, the segment of the continental margin between Cross Sound and Icy Bay, northern Gulf of Alaska, are delineated by multichannel ... Dangerous River. The Dangerous River zone separates the Yakutat segment into two distinct subbasins. The eastern subbasin ... diagonally across the shelf. Sedimentary strata throughout the Yakutat shelf show regional subsidence and only minor deformation ... major subduction of the Pacific plate beneath the Yakutat margin has occurred during the late Cenozoic. However, ...
Tópico(s): Methane Hydrates and Related Phenomena
1982 - United States Department of the Interior | Antarctica A Keystone in a Changing World
Richard O. Lease, Peter J. Haeussler, Robert C. Witter, Daniel F. Stöckli, Adrian M. Bender, Harvey M. Kelsey, Paul B. O’Sullivan,
... fault, but its long-term role in localizing Yakutat–(Pacific–)North America plate motion is poorly constrained. ... that extremely rapid 5–10 km/m.y. Yakutat exhumation rates are localized within the bend. Further northwest, Yakutat AHe and zircon (U-Th)/He (ZHe) ages ... the Cenozoic–Cretaceous sedimentary cover of the eastern Yakutat microplate through a stationary restraining bend along the edge of the North America plate. Yakutat cooling ages imply a long-term strike-slip ...
Tópico(s): High-pressure geophysics and materials
2021 - Geological Society of America | Geology
Michael Everett Mann, G. A. Abers, Kiara A. Daly, Douglas H. Christensen,
Abstract An oceanic plateau, the Yakutat terrane, has entered the subduction system across southcentral Alaska. Its down‐dip fate and relationship to overlying volcanism is still debated. ... WVLF stations shows the ∼18 ± 4 km thick Yakutat crust subducting beneath the Wrangell Volcanic field to ... depths <45 km, CCP stacking reveals that the Yakutat crust is continuous for over 450 km along ... deeper offset suggest a tear in the subducting Yakutat slab at depths >45 km, around 146°W. ... continuous thin low‐velocity layer atop the underthrust Yakutat crust for >450 km along strike, at all ...
Tópico(s): Geological and Geochemical Analysis
2021 - Wiley | Journal of Geophysical Research Solid Earth
Anna Schartman, Eva Enkelmann, John I. Garver, Cameron M. Davidson,
Cooling ages of tectonic blocks between the Yakutat microplate and the Fairweather transform boundary fault reveal exhumation due to strike-slip faulting and subsequent collision into this tectonic corner. The Yakutat and Boundary faults are splay faults that define ... of coseismic uplift from the M 8.1 Yakutat Bay earthquake of 1899 and 4 m of ... block was accommodated by reverse faulting along the Yakutat fault and the newly proposed Calahonda fault, which is parallel to the Yakutat fault. The Eocene schist of Nunatak Fiord and ...
Tópico(s): High-pressure geophysics and materials
2019 - Geological Society of America | Lithosphere
A. Marechal, Jean‐François Ritz, Matthieu Ferry, S. Mazzotti, Pierre‐Henri Blard, Régis Braucher, Dimitri Saint‐Carlier,
The Yakutat collision in SE Alaska – SW Yukon is an outstanding example of indentor tectonics. The impinging Yakutat block strongly controls the pattern of deformation inland. ... the complex partitioning of deformation inland of the Yakutat collision, where the role and slip rate of ... the radial stress and strain pattern around the Yakutat collision eastern syntaxis.
Tópico(s): Geology and Paleoclimatology Research
2017 - Elsevier BV | Earth and Planetary Science Letters
... zone are complicated by the inclusion of the Yakutat microplate, which is colliding into and subducting beneath ... zone coincides with the edges of the downgoing Yakutat terrane, and tremors transition from periodic to continuous ... semicontinuous slip occurring at the interface between the Yakutat and North America plates. The slow slip region ... may provide evidence for a connection between the Yakutat slab and the aseismic Wrangell slab.
Tópico(s): High-pressure geophysics and materials
2016 - Geological Society of America | Geology
S. P. S. Gulick, R. Reece, Gail Christeson, Harm J. A. Van Avendonk, L. L. Worthington, Terry L. Pavlis,
... images of the Transition fault and the unstable Yakutat–Pacific–North American triple junction S.P.S. ... images of the Transition fault and the unstable Yakutat–Pacific–North American triple junction. Geology 2013;; 41 ( ... Abstract In southern Alaska, the Pacific plate and Yakutat terrane subduct beneath the North American plate along ... during the Pliocene–Pleistocene, the Pacific–North American–Yakutat triple junction became unstable. Four recent seismic images ...
Tópico(s): Seismic Waves and Analysis
2013 - Geological Society of America | Geology
Gail Christeson, Harm J. A. Van Avendonk, S. P. S. Gulick, R. Reece, G. L. Pavlis, Terry L. Pavlis,
... structure and a Moho interface depth for the Yakutat terrane in southern Alaska. We use a tomographic ... interface model. The average Moho depth of the Yakutat terrane in the marine portion of our study ... a continuous Moho at the base of the Yakutat terrane, with no evidence for Pacific oceanic crust underthrusting the Yakutat terrane. We present several geologic models for crustal ...
Tópico(s): Seismic Imaging and Inversion Techniques
2013 - Wiley | Journal of Geophysical Research Solid Earth
Lucinda J. Leonard, R. D. Hyndman, S. Mazzotti, L. Nykolaishen, Michaël Schmidt, S. Hippchen,
... Cordillera of NW Canada and eastern Alaska. The Yakutat block is currently colliding with North America in ... Gulf of Alaska. Our data infer that relative Yakutat–North America motion is accommodated across the eastern ... westward extrusion and possible counterclockwise rotation of the Yakutat block and Alaskan fore arc facilitated by ∼23 ... data confirm the transfer of strain from the Yakutat collision zone and enable the extent of plate ... is transferred at least 400 km from the Yakutat collision. Continued transfer north toward the Mackenzie Delta ...
Tópico(s): Geological and Geochemical Analysis
2007 - American Geophysical Union | Journal of Geophysical Research Atmospheres
Terry L. Pavlis, Carlos Picornell, Laura Serpa, Ronald L. Bruhn, George Plafker,
... northern North America. The orogen originated when the Yakutat terrane was excised from the Cordilleran margin and ... analysis of Euler poles for motion of the Yakutat microplate with respect to North America and the Pacific. This analysis indicates a Yakutat‐Pacific pole near the present southern triple junction ... offshore Transition fault, onland structures adjacent to the Yakutat foreland, or both, with plate speeds increasing from ... Transition fault may have accommodated much of the Yakutat‐Pacific convergence on the basis of our analysis ...
Tópico(s): High-pressure geophysics and materials
2004 - Wiley | Tectonics
Research Article| June 01, 2002 Yakutat collision and strain transfer across the northern Canadian Cordillera Stéphane Mazzotti; Stéphane Mazzotti 1Pacific Geoscience Centre, Geological Survey of Canada, 9860 ... Search Site Citation Stéphane Mazzotti, Roy D. Hyndman; Yakutat collision and strain transfer across the northern Canadian ... Search Advanced Search Abstract The collision of the Yakutat block in the corner of the Gulf of ... to the northeast. Strain is transmitted from the Yakutat collision across the northern Cordillera with little intervening ...
Tópico(s): Methane Hydrates and Related Phenomena
2002 - Geological Society of America | Geology
Brad A. Andres, Brian T. Browne,
... and timing of spring shorebird migration on the Yakutat Forelands, Alaska. Western Sandpipers (Calidris mauri) and Dunlins ( ... on shorebird distribution, we estimated that the entire Yakutat Forelands supports a spring population of more than ... unpubl. data) indicated that small estuaries on the Yakutat Forelands, heretofore thought to be of minor importance ... and timing of spring shorebird migration on the Yakutat Forelands and to assess its importance as a ...
Tópico(s): Fire effects on ecosystems
1998 - Wilson Ornithological Society | The Wilson Journal of Ornithology
Thomas M. Brocher, G. S. Fuis, Michael A. Fisher, George Plafker, M.J. Moses, John Taber, Nikolas I. Christensen,
... determine the geometry of the Prince William and Yakutat terranes, the Aleutian megathrust, and the subducting Pacific plate. In this complex region, the Yakutat terrane is underthrust beneath the Prince William terrane, ... in Eocene age oceanic crust of the underthrust Yakutat terrane. Wide‐angle seismic data, magnetic anomaly data, and tectonic reconstructions indicate that the Yakutat terrane has been underthrust beneath the Prince William ... plate of a fairly uniform thickness and the Yakutat plate of varying thickness, is subducting beneath southern ...
Tópico(s): Geological and Geochemical Analysis
1994 - American Geophysical Union | Journal of Geophysical Research Atmospheres
... 01, 1906 Recent changes of level in the Yakutat Bay region, Alaska* RALPH S. TARR; RALPH S. ... LAWRENCE MARTIN; Recent changes of level in the Yakutat Bay region, Alaska. GSA Bulletin 1906;; 17 (1): ... September 25, 1899, contains a letter sent from Yakutat, Alaska, September 17, by the Reverend Sheldon Jackson, ... an Indian burial ground at Port Mulgrave, opposite Yakutat. Most of the . . . This content is PDF only. ...
Tópico(s): Climate change and permafrost
1906 - Geological Society of America | Geological Society of America Bulletin