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. Denali Fault. Areas affected by liquefaction are largely confined to Holocene alluvial deposits, man-made embankments, and backfills. Detailed Description At pass west of Delta River. 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. Eastern Denali Fault surface trace map, eastern Alaska and Yukon, Canada. Abstract . 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 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. In the winter of 2002 a large (7.9) earthquake on the Denali fault produced a surface rupture, in the landscapes, glaciers included. The more northerly Hines Creek fault appears to have a broadly arcuate trace across the study area, but the fault is exposed only locally. The Denali-Totschunda fault is a major dextral (right lateral) strike-slip system, similar in scale to the San Andreas fault system. Image from and a lot more information at http://ak.water.usgs.gov/glaciology/m7.9_quake/ . Tectonic setting for the Denali fault. 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. (a) Location map showing the Pacific–North American Plate boundary in Alaska. The image is from http://pubs.usgs.gov/fs/2003/fs017-03/ . The rupture of the snow provided a detailed, shall we3 say, striking, picture of the rupture trace. Field work complements the air photo observations in locations of dense vegetation, on bedrock, or in areas where the surface trace is weakly developed. 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. Figure 2 (bottom): Geologic map of part of the 2002 Denali Fault rupture near the Trans-Alaska Pipeline crossing in the Alaska Range. A Alaska Earthquake Frequency Map Alaska Offshore Subduction Fault Zone Map Alaska Earthquake Hazard Map Alaska Faults and Volcanoes Taken from http://people.arsc.edu/~kcarlson/Other/EQ.html . | Help 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 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. If the curvature is smaller than that what are the strain implications. Location. Policies and Notices, U.S. Department of the Interior | U.S. Geological Survey Also, the details of the mechanics of uplift are of interest. There is permafrost at the bottom of the cracks. The Denali Fault is located in Alaska's Denali National Park and to the east. Notice it is not a Fitch fault as it does not follow the magmatic arc complex. The Denali and Totschunda Faults are located along the northeastern edge of the Wrangell Subplate. The Denali fault is an active intraplate dextral strike-slip fault. This National Park includes part of a massive mountain range more than 600 miles long. Purdue University website on GPS research on Denali. Page Created: February 6, 2009 Previous estimates of the slip rate on the Denali Fault are variable, ranging from ≤3 to 10–20 mm yr −1 . [Adrian M Bender; Peter J Haeussler; Geological Survey (U.S.),] | PDF help However, it wasn’t until the discovery of the Cascadia Fault in the 1960s th… This National Park includes part of a massive mountain range more than 600 miles long. The Denali fault is an active intraplate dextral strike-slip fault. Points were digitized 4.3 m apart, on average, for the entire surface rupture. Remember that pure strike-slip movement would follow a small circle path. 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 Denali Fault is located in Alaska's Denali National Park and to the east. 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. View south along the Trans Alaska Pipeline in the zone where it was engineered for the Denali fault. Page Contact Information: Michael Diggles Notice it is not a Fitch fault as it does not follow the magmatic arc complex. 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. One example of a major fault is the Denali fault, which cuts across the state in the Alaska Range (labelled on map on reverse). 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. This is a USGS produced shake map, which shows the relative magnitudes of ground shaking during the 2002 earthquake. URL: https://pubs.usgs.gov/ds/422/ 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. 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. FOIA Here there was roughly 5 m of offset. Rupture of Denali fault responsible for magnitude 7.9 Alaskan earthquake of November 3. Image courtesy of the USGS. One can ask why it localized where it did? 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… Now considered a foreshock of the larger quake, the October earthquake caused no surface ruptures. Note the strong curvature of the topography and fault. USGS map of topography and earthquakes associated with Denali fault in Alaska. It illuminates earthquake mechanics and hazards of large strike-slip faults. 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 few remaining Native Americans in the area spoke of the earth shaking and ocean rising to consume the land. 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. Image from http://pubs.usgs.gov/fs/2003/fs014-03/shakemap.html. Along the Denali Fault, lateral and vertical offset movement is taking place. 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.. Tectonic setting. Plafker and Clague mapped the fault in Alaska and Yukon respectively, providing the basis for generalized digital maps … (b) 2002 Denali Earthquake Sequence showing location of M6.7 Nenana Mountain Earthquake and M7.9 Denali Fault Earthquake and Download a free copy of the current version of Adobe Reader. 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. Note also, that Alaska is not behaving as one rigid plate. Denali's Fault (GC10DJK) was created by Tundra-quad on 1/16/2007. 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 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. 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 . | Geologic 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. Division | Alaska Science Center This is a USGS produced shake map, which shows the relative magnitudes of ground shaking during the 2002 earthquake. Applying the Geologic Map This is typical for strike-slip faults. Many tribes even left the region permanently. 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). Image taken from http://earthobservatory.nasa.gov/Study/denali/ . 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. The eastern Denali fault maintains a strike of 124° for more than 150 km to the U.S.‐Canada border. 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. Page Last Modified: February 6, 2009 It's located in Alaska, United States.Located at a roadside pull out just south of Delta Junction before Ft Greely. The topography here is driven by the deformation associated with the fault. 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. Early-stage exploration for geothermal energy resources along the Denali fault near Duke River, Yukon. Credit: compiled by K. Ridgeway, Purdue University. 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. | Western reports main page | Western Data Series reports | Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska - RI 2020-7 New release! The November 3 Denali Fault earthquake was preceded by the magnitude 6.7 Nenana Mountain earthquake on October 23. Privacy The Denali Fault is part of a complex zone of con-tinental deformation between the Aleutian megathrust and the Queen Char-lotte Transform. Alaska is a geographical marvel. 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 … It's a Not chosen size geocache, with difficulty of 1, terrain of 1. The fault trace passes beneath the pipeline between the 2nd and 3rd slider supports at the far end of the zone. 40Ar/39Ar data from the Richardson mining district, Big Delta Quadrangle, Alaska - RDF 2020-11 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. Note the elongate pattern that follows the fault. The fault is dextral. The location map of the study site of Denali Fault line in southwest Yukon. Witter, J.B., 2020. 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. (mfd). Note the push up in the background. |, Accessibility The Denali Fault and Earthquakes. Get this from a library! Note the striking contrast in rock type and age on opposite sides of the fault. Note the fairly complex fracture geometry associated with the rupture. 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. 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