Image from and a lot more information at http://ak.water.usgs.gov/glaciology/m7.9_quake/ . Figure 2 (bottom): Geologic map of part of the 2002 Denali Fault rupture near the Trans-Alaska Pipeline crossing in the Alaska Range. Points were digitized 4.3 m apart, on average, for the entire surface rupture. The more northerly Hines Creek fault appears to have a broadly arcuate trace across the study area, but the fault is exposed only locally. Between 1912 and 2002 the level of recorded seismicity on this section of the Denali Fault was very low with the majority of earthquakes M > 4.5 occurring on thrust faults to the north or south . The November 3, 2002, Mw7.9 Denali Fault earthquake produced about 340 km of surface rupture along the Susitna Glacier Thrust Fault and the right-lateral, strike-slip Denali and Totschunda Faults. A URL: https://pubs.usgs.gov/ds/422/ By the time Lewis and Clark arrived on the West Coast in 1805, it had been 105 years since the Cascadia Subduction Zone last ruptured, sending a large portion of the Pacific Ocean roaring toward the coast. Digital photogrammetric methods were primarily used to create a 1:500-scale, three-dimensional surface rupture map, and 1:6,000-scale aerial photographs were used for three-dimensional digitization in ESRI’s ArcMap GIS software, using Leica’s StereoAnalyst plug in. Taken from http://people.arsc.edu/~kcarlson/Other/EQ.html . Notice it is not a Fitch fault as it does not follow the magmatic arc complex. Now considered a foreshock of the larger quake, the October earthquake caused no surface ruptures. This is typical for strike-slip faults. Alaska is a geographical marvel. The Denali-Totschunda fault is a major dextral (right lateral) strike-slip system, similar in scale to the San Andreas fault system. On the Denali fault, a simple model with large slip patches ﬁnds a maximum of 8.7 0.7 m of slip between the surface and 14.3 0.2 km depth. Early-stage exploration for geothermal energy resources along the Denali fault near Duke River, Yukon. Areas affected by liquefaction are largely confined to Holocene alluvial deposits, man-made embankments, and backfills. However, it wasn’t until the discovery of the Cascadia Fault in the 1960s th… Denali Fault. In 2002, the M 7.9 earthquake ruptured a portion of the Denali fault east of the park to produce a horizontal offset of up to 8.8 m (29 feet). We map the 385-kilometer (km) long surface trace of the right-lateral, strike-slip Denali Fault between the Totschunda-Denali Fault intersection in Alaska, United States and the village of Haines Junction, Yukon, Canada. Credit: compiled by K. Ridgeway, Purdue University. Policies and Notices, U.S. Department of the Interior | U.S. Geological Survey Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska - RI 2020-7 New release! Division | Alaska Science Center Note the strong curvature of the topography and fault. Thin lines sho w the Denali and T otschunda faults on the base map of the Alaskan topo graph y.Tw o focal mechanisms indicate the Har vard CMT so-lutions for the 2002 Nenana Mountain and Denali fault ear thquak es; bo xes sho w the surf ace projections of the Phase III model discussed later. The 2002 M7.9 Denali fault earthquake resulted in 340 km of ruptures along three separate faults, causing widespread liquefaction in the fluvial deposits of the alpine valleys of the Alaska Range and eastern lowlands of the Tanana River. Earthquake-induced landslides, sackungen, and unruptured Holocene fault scarps on the eastern Denali Fault were also digitized where they lay within the limits of air photo coverage. We map the 385-kilometer (km) long surface trace of the right-lateral, strike-slip Denali Fault between the Totschunda-Denali Fault intersection in Alaska, United States and the village of Haines Junction, Yukon, Canada. Earthquake-induced landslides, sackungen, and unruptured Holocene fault scarps on the eastern Denali Fault were also digitized where they lay within the limits of air photo coverage. Note the push up in the background. Download a free copy of the current version of Adobe Reader. Image courtesy of the USGS. The image is from http://pubs.usgs.gov/fs/2003/fs017-03/ . Get this from a library! This is a USGS produced shake map, which shows the relative magnitudes of ground shaking during the 2002 earthquake. The fault is dextral. Many tribes even left the region permanently. The Denali fault is an active intraplate dextral strike-slip fault. The azimuths of the eastern Denali fault and Totschunda fault, where they sub‐parallel each other east of the transfer zone, differ on average by 12 degrees. The Denali Fault is part of a complex zone of con-tinental deformation between the Aleutian megathrust and the Queen Char-lotte Transform. Witter, J.B., 2020. The location map of the study site of Denali Fault line in southwest Yukon. One can ask why it localized where it did? It's a Not chosen size geocache, with difficulty of 1, terrain of 1. Purdue University website on GPS research on Denali. The M W (moment magnitude) 7.9 Denali fault earthquake on 3 November 2002 was associated with 340 kilometers of surface rupture and was the largest strike-slip earthquake in North America in almost 150 years. The Denali Fault and Earthquakes. Remember that pure strike-slip movement would follow a small circle path. If the curvature is smaller than that what are the strain implications. Tectonic setting for the Denali fault. Location. Page Contact Information: Michael Diggles The Denali fault is an active intraplate dextral strike-slip fault. Detailed Description At pass west of Delta River. Interpreting and applying the information from these maps allowed geologists and engineers to identify the section of the pipeline that could be in most danger from an earthquake. The eastern Denali fault maintains a strike of 124° for more than 150 km to the U.S.‐Canada border. Page Created: February 6, 2009 Tectonic setting. Page Last Modified: February 6, 2009 Eastern Denali Fault surface trace map, eastern Alaska and Yukon, Canada. Alaska Earthquake Frequency Map Alaska Offshore Subduction Fault Zone Map Alaska Earthquake Hazard Map Alaska Faults and Volcanoes Abstract . (a) Location map showing the Paciﬁc–North American Plate boundary in Alaska. Alaska’s network of faults is a result of tectonic activity; the Pacific Plate is actively subducting (sliding under) the North American Plate, and the Denali Fault is located on the boundary between the two plates. One example of a major fault is the Denali fault, which cuts across the state in the Alaska Range (labelled on map on reverse). Thick vegetation, along with complex glacial landforms, large braided rivers, and fault-parallel bedrock structure (e.g., bedding) obscure the Eastern Denali Fault's surface expression. | Western reports main page | Western Data Series reports | FOIA The Denali Fault is located in Alaska's Denali National Park and to the east. Note the elongate pattern that follows the fault. | Geologic Eastern Denali Fault Surface Trace Map, Eastern Alaska and Yukon, Canada By Adrian M. Bender and Peter J. Haeussler . This is a USGS produced shake map, which shows the relative magnitudes of ground shaking during the 2002 earthquake. The Denali and Totschunda Faults are located along the northeastern edge of the Wrangell Subplate. The geology near the pipeline crossing showed older rocks on the north side of the fault that are side-by-side with younger rocks on the south s… Image from http://pubs.usgs.gov/fs/2003/fs014-03/shakemap.html. It's located in Alaska, United States.Located at a roadside pull out just south of Delta Junction before Ft Greely. Here there was roughly 5 m of offset. Seventeen km of the fault trace, which broke through glacier ice, were not digitized in detail due to time constraints, and air photos missed another 10 km of fault rupture through the upper Black Rapids Glacier, so that was not mapped in detail either. [Adrian M Bender; Peter J Haeussler; Geological Survey (U.S.),] 40Ar/39Ar data from the Richardson mining district, Big Delta Quadrangle, Alaska - RDF 2020-11 It began with thrusting on the previously unrecognized Susitna Glacier fault, continued with right-slip … The fault trace passes beneath the pipeline between the 2nd and 3rd slider supports at the far end of the zone. Note the striking contrast in rock type and age on opposite sides of the fault. Rupture of Denali fault responsible for magnitude 7.9 Alaskan earthquake of November 3. PASADENA, Calif.- Geologists just back from a reconnaissance of the 7.9-magnitude Alaska earthquake of November 3 confirm that rupture of the Denali fault was the principal cause of the quake. Is this a flower structure of some sort, or does some other architecture exist. |, Accessibility This National Park includes part of a massive mountain range more than 600 miles long. In that the highest mountain in North America lies in proximity, the deformation complex has a major vertical component of motion, and the Denali fault is a transpressive feature. Plafker and Clague mapped the fault in Alaska and Yukon respectively, providing the basis for generalized digital maps … DENALI FAULT SYSTEM Hines Creek fault The McKinley and Hines Creek strands of the Denali fault system form the principal structural elements of the central Alaska Range. The Denali Fault is located in Alaska's Denali National Park and to the east. This digital three-dimensional fault-trace map is superior to traditional maps in terms of relative and absolute accuracy, completeness, and detail and is used as a basis for three-dimensional visualization. Along the Denali Fault, lateral and vertical offset movement is taking place. Alaska's major faults that include - Alaska-Aleutian Megathrust, Clark Fault, Denali Fault, Kaltag Fault, Kodiak Shelf Fault, Chugach-St. Elias Fault, Fairweather Fault, and Caribou Fault. This same earthquake offset the Alaska pipeline some 14 feet, which the pipeline was engineered and did accommodate. 0.4 m slip on the Susitna Glacier fault, between 1 and 9.5 km depth on a 29 km long fault that dips north at 41 0.7 and has a surface projection close to the mapped rupture. The Denali Fault is a major intracontinental dextral (right lateral) strike-slip fault in western North America, extending from northwestern British Columbia, Canada to the central region of the U.S. state of Alaska.. It illuminates earthquake mechanics and hazards of large strike-slip faults. (mfd). Because earthquakes tend to recur along faults, an earthquake that relieves stress on one part of a fault may actually increase stress on other parts of a fault system. Denali's Fault (GC10DJK) was created by Tundra-quad on 1/16/2007. The topography here is driven by the deformation associated with the fault. Field work complements the air photo observations in locations of dense vegetation, on bedrock, or in areas where the surface trace is weakly developed. Note the fairly complex fracture geometry associated with the rupture. The eastern section of the Denali Fault did not rupture during the 2002 Denali Fault earthquake (Mw 7.9), however seismologic, geodetic, and geomorphic evidence along with a paleoseismic record of several past ground-rupturing earthquakes demonstrate the fault is active. USGS map of topography and earthquakes associated with Denali fault in Alaska. Download the text as a 13-page PDF (ds422_text.pdf; 5.9 MB), Download the map as a 36" x 19" PDF (ds422_fig3_DF_bigmap.pdf; 31.6 MB), Google® Earth files; this package consists of a folder that contains two .kml files and two .kmz files with which you can add the data from this report to your copy of Google® Earth (google_earth_files.zip; 5.3 MB compressed; 6 MB uncompressed), Readme file that contains descriptions of the digital dataset files (DFrupture_readme.txt; 56 kB), Metadata for: air photos (DFrupture_meta_DFairphotos.txt; 64 kB), kilometers (DFrupture_meta_DFkilometers.txt; 64 kB), and lines (DFrupture_meta_DFlines.txt; 72 kB), Shape files (DFrupture_shape.zip; 3.6 MB compressed; 19.6 MB uncompressed), Database (DFrupture_mdb.zip; 34.5 MB compressed; 249 MB uncompressed), Topos (DFrupture250ktopos.zip; 24.8 MB compressed; 209 MB uncompressed), gen files (DFrupture_gen.zip; 2.6 MB compressed; 11.2 MB uncompressed), For questions about the content of this report, contact Peter Haeussler. The rupture of the snow provided a detailed, shall we3 say, striking, picture of the rupture trace. Image taken from http://earthobservatory.nasa.gov/Study/denali/ . Applying the Geologic Map There is permafrost at the bottom of the cracks. | PDF help This National Park includes part of a massive mountain range more than 600 miles long. View south along the Trans Alaska Pipeline in the zone where it was engineered for the Denali fault. Mapping the bedrock geology along the 1,000-mile-long Denali fault revealed information on past movement on the fault and the likely direction of motion on the fault in future earthquakes. The November 3 Denali Fault earthquake was preceded by the magnitude 6.7 Nenana Mountain earthquake on October 23. Previous estimates of the slip rate on the Denali Fault are variable, ranging from ≤3 to 10–20 mm yr −1 . The few remaining Native Americans in the area spoke of the earth shaking and ocean rising to consume the land. This digital three-dimensional fault-trace map is superior to traditional maps in terms of relative and absolute accuracy, completeness, and detail and is used as a basis for three-dimensional visualization. http://earthobservatory.nasa.gov/Study/denali/, http://people.arsc.edu/~kcarlson/Other/EQ.html, http://ak.water.usgs.gov/glaciology/m7.9_quake/, Purdue University website on GPS research on Denali. The November 2002 earthquake had a magnitude of 7.9 and caused a surface rupture 325 km (~200 miles) long, mostly on the central Denali Fault (see red line on map … | Help Privacy In the winter of 2002 a large (7.9) earthquake on the Denali fault produced a surface rupture, in the landscapes, glaciers included. Notice it is not a Fitch fault as it does not follow the magmatic arc complex. (b) 2002 Denali Earthquake Sequence showing location of M6.7 Nenana Mountain Earthquake and M7.9 Denali Fault Earthquake and Note also, that Alaska is not behaving as one rigid plate. 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