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Minto Flats earthquake 1995
New Constraints on Tectonics of Interior Alaska: Earthquake Locations, Source Mechanisms, and Stress Regime
Transtensional Tectonics of the Minto Flats Fault Zone and Nenana Basin, Central Alaska
The seismogram at station COL for the 1995 M w 6.0 earthquake in Minto F...
Detailed view of the aftershocks of the 1995 Minto Flats M W 6.0 earthqu...
Seismic Response of Nenana Sedimentary Basin, Central Alaska
Cenozoic tectonic and thermal history of the Nenana basin, central interior Alaska: new constraints from seismic reflection data, fracture history, and apatite fission-track analyses
Crustal seismicity and station coverage in the MFFZ , central Alaska. The ...
The Quaternary thrust system of the northern Alaska Range
Seismicity of the Denali-Totschunda Fault Zone in Central Alaska (1912–1988) and Its Relation to the 2002 Denali Fault Earthquake Sequence
Imaging the Tectonic Grain of the Northern Cordillera Orogen Using Transportable Array Receiver Functions
The 1904 M s 7.3 Earthquake in Central Alaska
Slip partitioning along a continuously curved fault: Quaternary geologic controls on Denali fault system slip partitioning, growth of the Alaska Range, and the tectonics of south-central Alaska
LOWER CAMBRIAN RUSOPHYCUS FROM ELLESMERE ISLAND, ARCTIC CANADA: ICHNOFOSSIL OF A PREDATORY, NON-TRILOBITE ARTHROPOD
Geomorphic evidence of active transpressional deformation in the Tanana foreland basin, south-central Alaska
Geomorphic data from rivers in the Tanana foreland basin and northern foothills of the Alaska Range indicate that this is an actively deforming landscape. The Tanana basin is an alluvial and swampy lowland of ∼22,000 km 2 located in south-central Alaska between the northern flank of the Alaska Range and the Yukon-Tanana uplands. The major axial drainage of the basin is the Tanana river, which is fed by large transverse braided rivers flowing northward out of the Alaska Range. To better define active structures and the neotectonic configuration of the basin, we have constructed a series of longitudinal stream profiles along the major rivers of the Tanana basin. Stream profiles along with changes in channel morphologies delineate four main areas of active deformation. (1) In the western part of the basin, major rivers in the Kantishna Hills area have stream profiles and changes in channel morphologies that indicate that the northeast-trending Kantishna Hills anticlinorium is an active structure. All longitudinal stream profiles in this area exhibit convexity, suggesting tectonic perturbation, as they cross the trend of this 85-km-long structure. In addition, the channel of the McKinley River clearly becomes entrenched as it flows around the southwestern nose of the Kantishna Hills anticlinorium suggesting that the structure may be propagating southwestward. Our geomorphic data from this area are consistent with well-documented seismicity along the southwestern part of the Kantishna Hills. (2) In the central part of the basin, the Nenana River area, changes in channel morphology, stream profile perturbations, and uplifted Pliocene-Pleistocene erosional surfaces coincide with a series of east-trending anticlines. We interpret these folds as part of an active Neogene thrust belt that forms the foothills of the north-central Alaska Range. This active thrust belt is propagating northward and deforming the proximal part of the Tanana foreland basin. North of the topographic front of the foothills, stream profiles indicate active subsidence of the basin. (3) In the eastern part of the Tanana basin, the Delta River area, stream profiles and channel morphologies delineate active deformation along the strike-slip Denali fault and the Granite Mountain/Donnelly Dome thrust fault system. (4) In the northern part of the Tanana basin, the Fairbanks area, stream profiles and channel morphologies delineate northeast-trending active structures that coincide with known seismic zones. These structures are most likely related to block rotation between the Denali and Tintina fault systems along northeast-trending sinistral strike-slip faults. An interesting result of our analysis of the Fairbanks area is the hypothesis that the Tanana River has been forced to abandon its previous channels due to progressive uplift along an active northeast-trending structure. This forced migration has resulted in a series of watergaps, with the modern Tanana River having been deflected around the southwestern culmination of this structure. Interactions between fluvial systems and active structures of the Tanana basin provide a surface record of regional transpressional deformation. This deformation is accommodated by strain partitioning between strike-slip faults like the Denali fault, an active thrust belt along the northern flank of the Alaska Range, and rotation of crustal blocks between the Denali and Tintina fault systems.
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2020 Annual Meeting
Dynamic cause of marginal lithospheric thinning and implications for craton destruction: a comparison of the North China, Superior, and Yilgarn cratons
The role of fluids during formation and evolution of the southern Superior Province lithosphere: an overview
Deformed Tertiary sedimentary rocks and geomorphic features within the northern foothills of the Alaska Range illustrate the development of a fold-and-thrust belt during the past ca. 3 m.y. The northern foothills form a northward-convex salient at the apex of the Alaska Range and the Denali fault. The neotectonic framework of this region has not previously been established despite the proximity of the northern foothills to the Denali fault, several historic large-magnitude earthquakes, and clear topographic evidence of Quaternary deformation. A distinct east-trending topographic grain corresponds with the orientation of folds and faults defined both by bedrock and geomorphic features. To characterize the active structures of the region, we interpreted previous geologic mapping, developed structural cross sections, analyzed topographic and stream profiles, mapped a sequence of Quaternary fluvial terraces, and surveyed several terrace treads. A northward topographic slope across the northern foothills coupled with the pattern of faulting and folding suggests the presence of an orogenic wedge overlying a south-dipping basal detachment. Mapping and surveying of the terraces document continued uplift, folding, and faulting during terrace formation. Geomorphic analyses demonstrate deformation and differential uplift over the entire foothills belt. Together, these data and interpretations indicate the northern foothills are an active fold-and-thrust belt that is propagating northward into the Tanana basin. The identification of this fold-and-thrust belt documents a significant contractional component to the late Cenozoic evolution of the Alaska Range in addition to the obvious strike-slip motion on the Denali fault. Also, the tectonic activity of these structures indicates that this region represents a potential seismic hazard for nearby military facilities and important transportation corridors.