A free-field recording of the Denali fault earthquake was obtained by the Alyeska Pipeline Service Company 3 km from the surface rupture of the Denali fault. van der Meer. [2002] gave strong evidence that acoustic waves could be generated by secondary sources associated with motion of the seismic rupture along a fault. Displacement Mapped with Radarsat-1 Interferograms The interferometric synthetic aperture radar (InSAR) technique was used to map the co-seismic displacements that resulted from the 23 October and 3 November earthquakes, The survival of the Trans-Alaska Oil Pipeline in the 2002 Denali Fault earthquake demonstrates the value of combining careful geologic studies of earthquake hazards and creative engineering in designing and protecting such important structures and lifelines. Violent, prolonged shaking from the quake triggered thousands of landslides, especially on the steep slopes of the Alaska Range. 2156 Koyukuk Drive, PO Box 757320, Fairbanks, AK 99775. On May 21, 1991, a M6.1 earthquake occurred at a depth of 112 km right under Denali, and was noticed by climbing teams on the mountain who reported numerous massive snow and ice avalanches. EERI Although comparable in size and type to the quake that devastated San Francisco in 1906, the Denali Fault earthquake caused no deaths and little damage to structures because it struck a sparsely populated region of south-central Alaska. These effects were the result of a phenomenon called "liquefaction," in which strong, prolonged earthquake shaking transforms loose, water-saturated sediments into a liquid slurry. The Nenana Mountain and Denali Fault earthquakes generated a vigorous aftershock sequence. Introduction [2] On 3 November 2002, an M W 7.9 earthquake occurred on the Denali fault, central Alaska. Multiple land slides and rock avalanches occurred in the Alaska Range with the largest slide on the Black Rapids Glacier. On November 3, 2002 a devastating earthquake rattled Alaska. Deborah and Hess rise to about 12,000 feet (3650 m) just north of the epicenters and the bend in the Denali fault. While the fault rupture lasted for approximately 100 sec from its initiation to the arrest, its distal effects were felt for many days. They identified the previously unknown Susitna Glacier Fault in the area where the quake began and showed that the rest of the rupture exactly followed an older rupture that geologists had documented in the 1970's. Total length of the rupture was at least 300 km (190 miles). The Denali earthquake provides an opportunity to study how lifelines perform in an area 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 … 1). On November 3, 2002, the Denali Fault ruptured over a distance of 336 km, producing the largest earthquake from a continental strike-slip fault in North America since the 1906 San Francisco earthquake. But there's still a lot scientists don't know about it. Denali earthquake earthquake rupture SPOT offsets We use SPOT image pairs to determine horizontal offsets associated with the Mw 7.9 November 2002 Denali earthquake in the vicinity of Slate Creek, AK. during the 2002 Denali fault earthquake at pump station 10, located 3 km from the fault. From Tarbuck and Lutgens, 2005 Detecting Seismic Waves It is easy to visualize the motion of an ocean wave, and how we might measure its Recently, Le Pichon et al. (Photo and interpretation by Wesley K. Wallace, Geophysical Institute, University of Alaska Fairbanks). The 1857 California and 2002 Alaska earthquakes struck far from major cities, causing little or no loss of life. Because some of the faults in southeast Alaska are heavily glaciated, Ford and his colleagues are also interested in studying the relationship between glaciers and structural geology. The Denali Fault quake is similar to three earthquakes that ruptured the San Andreas Fault in the past few centuries. The 2002 Denali earthquake triggered at least 1580 landslides in an area of 7150 km 2, and up to ∼380 km away from the epicenter. Should such a quake occur today, San Bernardino, Los Angeles, and other populations centers in southern California could suffer heavy damage and loss of life. The runway was rendered unusable by lateral spreading, accompanied by sand boils. The 434 mile slip-strike fault gave off a 7.9 magnitude earthquake. This powerful shock may have been triggered by a magnitude 6.7 temblor, the Nenana Mountain earthquake, that occurred nearby on the same fault 10 days earlier. The 2002 (M w 7.9) Denali fault earthquake was the largest strike-slip rupture to take place on the North American continent in over 150 years and was comparable in magnitude, if not rupture length, only to the 1906 (M w 7.8) San Francisco earthquake and the 1857 (M … (1) be equal to v 0, such that the initial stress before the earthquake is τ 0 = σμ, then from eq. The magnitude of completeness mc of the aftershock catalog varies along the rupture zone. Earthquake Sequence The Denali fault earthquake sequence be-gan with the moment magnitude (M W) 6.7 Nenana Mountain earthquake on 23 Octo-ber 2002 (Fig. Although slightly damaged by movement on the fault and by intense shaking, the pipeline did not break in the quake, averting a major economic and environmental disaster. A fact from 2002 Denali earthquake appeared on Wikipedia's Main Page in the Did you know? The Mw 7.9 Denali Fault (DF) earthquake in 2002 was the largest continental strike-slip earthquake in North America since the 1857 Fort Tejon, California event and provides a new opportunity to study postseismic deformation using InSAR (Fig. RADARSAT-1 images used are from October 16 and November 9, 2002, and cover 100 kilometers by 200 kilometers. sorry I forgot to ask the question The 2002 Denali Fault Earthquake is among the biggest North America n quakes on record, its magnitude being the same as that of the 1906 San Francisco Earthquake. The earthquake was preceded by an M W 6.7 right‐lateral strike‐slip earthquake on 23 October, with its epicenter only 22 km west of the M W 7.9 epicenter [Eberhart‐Phillips et al., 2003].These earthquakes are the largest earthquakes to occur on the Denali fault in recorded history. But there's still a lot scientists don't know about it. What is the question?! On Nov. 3, 2002, the Great Alaskan tremor struck. BRAINLIESTTT ASAP! After the Nenana Mountain earthquake, AEIC installed several temporary seismographs, including some ANSS instruments. The MW (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. Its length and slip magnitudes are comparable with those of the great California earthquakes of 1906 and 1857 and last year's Kokoxili earthquake along the Kunlun fault, Tibet. The epicenter was located about 88 km west of the Trans-Alaska Pipeline, and the rupture propagated to the east across the pipeline right-of-way. While on average for October-December data mc is 1.4, it is as low as 1.1 at the western end of the rupture and as high as 2.2 at the eastern end. during the 2002 Denali fault earthquake at pump station 10, located 3 km from the fault. A magnitude 4.4 foreshock preceded the Denali Fault mainshock by 3.5 hours. The locations of the Nenana Mountain and Denali Fault earthquakes and their aftershocks were determined by the Alaska Earthquake Information Center (AEIC) at the University of Alaska Fairbanks. It ruptured three different faults ending with a total rupture length of ~330 km. The MW (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. Measuring 7.9 in magnitude, the earthquake caused ground to shift beneath the pipeline 14 feet horizontally and 2.5 feet vertically. The M 7.9 Denali Fault event was preceded by the magnitude 6.7 Nenana Mountain event on October 23, 2002. In 2002, the Denali Fault in central Alaska ruptured catastrophically, unleashing a magnitude-7.9 earthquake. 2). It ruptured three different faults ending with a total rupture length of ~330 km. Response of a 14-Story Anchorage, Alaska, Building in 2002 to Two Close Earthquakes and Two Distant Denali Fault Earthquakes Earthquake Spectra The horse canyon earthquake of August 2, 1975—Two-stage stress-release process in a strike-slip earthquake The Parks Highway, which connects Anchorage and Fairbanks, lies immediately east of the river north of the fault, but diverges from the river to the south. Yellowstone National Park had the most energetic swarm of triggered earthquakes. These waves generate a secondary Called the Denali Fault earthquake, this shock was the strongest ever recorded in the interior of Alaska. T. Gorum, O. Korup, C.J. Like the Denali Fault quake, the Nenana Mountain shock caused only limited damage because of its remote location. Having rumbled such a large area of Alaska, it is quite remarkable that the Denali quake caused as little damage as it did. Compiled By Gary S. Fuis and Lisa A. Wald, Edited by James W. Hendley II and Peter H. Stauffer Graphic design by Susan Mayfield, Sara Boore, Eleanor Omdahl, and J. Luke Blair; Web layout by Carolyn Donlin, COOPERATING ORGANIZATIONS Alaska Division of Geological and Geophysical Surveys Alaska Earthquake Information Center, Geophysical Institute, University of Alaska Fairbanks Alaska Volcano Observatory Alyeska Pipeline Service Company California Institute of Technology Central Washington University Humboldt State University University of California Berkeley West Coast and Alaska Tsunami Warning Center, For more information contact: Earthquake Information Hotline (650) 329-4085 U.S. Geological Survey, Mail Stop 977 345 Middlefield Road, Menlo Park, CA 94025 Visit the USGS Earthquake Hazards Program website to learn more, PDF version of this fact sheet (2.2 MB) REDUCING EARTHQUAKE LOSSES THROUGHOUT THE UNITED STATES, For questions about the content of this report, contact Gary Fuis, Download the current version of Acrobat Reader for free, | Help | PDF help | Geopubs main page | Fact Sheets |, | Department of the Interior | Privacy Statement | Disclaimer | Accessibility | URL of this page: https://pubs.usgs.gov/fs/2003/fs014-03/ Maintained by: Michael Diggles Created: February 5, 2003 Last modified: May 17, 2005 (mfd), the pipeline did not break in the quake, the 2002 Denali Fault earthquake occurred on a "strike-slip" fault, Denali Fault quake is similar to three earthquakes that ruptured the San Andreas Fault in the past few centuries, USGS Earthquake Hazards Program website. 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