It was the main fault along which the 2002 Denali earthquake occurred, which was measured as a magnitude of 7.9 Mw. A trace of the Denali Fault runs up the north side of the Canwell Glacier. The Denali Fault, the fastest moving and most active fault in Interior Alaska, cuts through the heart of the Alaska Range and Denali National Park and Preserve. The earthquake began at 1:12 p.m. Alaska local time, and was centered approximately 135 kilometers (84 miles) south of Fairbanks and 283 kilometers (176 miles) north of Anchorage. They also prevent material from filling in faults, which tends to keep faults active. Kahiltna Glacier is the longest glacier in the park. The Denali-Totschunda fault is a major dextral (right lateral) strike-slip system, similar in scale to the San Andreas fault system. One of the biggest challenges with SAR imagery is the infrequency of satellite overpasses. The Alaska Range is a 600-mile long arc of mountains that stretches from the Alaska-Canada border all the way to the Alaska Peninsula. 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. Once the satellite acquired the image we needed, ASF downloaded and formatted it, and it was ready for us within hours,” said Ford. 1998. The Denali Fault earthquake will give clues to the behavior of underground layers of rock known as the lower crust and mantle. “We want to know how earthquakes affect the behavior of these glaciers and how the glaciers are moving and responding,” said Ford. The November 3 Denali Fault earthquake was preceded by the magnitude 6.7 Nenana Mountain earthquake on October 23. Interferometry involves taking Synthetic Aperture Radar (SAR) satellite images from two different dates and precisely calculating the differences between the two. While the November 3 earthquake in Alaska caused few injuries and no deaths, it did cause numerous landslides and damaged roads and bridges at a cost of at least $25 million. Although Alaska’s Denali Fault was home to a network of GPS receivers, earthquakes are unpredictable, and no one knows whether the next one will strike in a location with a GPS receiver to measure it. The cause? “With InSAR, we can capture the whole picture, no matter where the epicenter of an earthquake is,” said Ford. This places the rupture in the same class as those that produced the San Andreas fault's two historical great earthquakes in 1906 and 1857. If that is the case, the longer fault system could produce larger temblors. Facts about Denali National Park 2: the landscape of Denali National Park. Measuring 7.9 in magnitude, the earthquake caused ground to shift beneath the pipeline 14 feet horizontally and 2.5 feet vertically. According to Ford, “The Denali Fault earthquake was the ‘big one’ for Alaska.” The cracks in the Earth’s surface along parts of the fault were up to 6.7 meters (22 feet) wide, which would have caused considerable damage to a more heavily populated area, such as California. Prior to the 2002 earthquakes, the Denali Fault was known to be seismically active, but scientists weren’t sure if it was capable of generating a large earthquake. The November 3, 2002, magnitude (M) 7.9 Denali Fault earthquake was the strongest ever recorded in the interior of Alaska. Fortunately, ASF had images from October 5 (prior to the foreshock earthquake), October 29 (between the two earthquakes), and November 22 (after the second earthquake) that included the area of both earthquakes’ epicenters. However, only 13,803 feet (4,207 meters) rise above sea level. USGS Fact Sheet 014-03: Rupture in South-Central Alaska — The Denali Fault Earthquake of 2002, NASA Goddard Space So Ford and his colleagues turned to SAR imagery from RADARSAT-1 (a satellite managed by the Canadian Space Agency), which had never before been applied in earthquake interferometry. It is located near the centre of the Alaska Range, with two summits rising above the Denali Fault, in south-central Alaska, U.S. Denali’s official elevation figure of 20,310 feet (6,190 metres), established by the United States Geological Survey in September It has rock for-mations that have b… You can also find deciduous taiga here. The Denali fault system is widely recognized as transpressional due to the presence of the Denali fault, a major, active, right-lateral fault, and subparallel zones of thrust faults and fault-related folding along both the north and south flanks of the Alaska Range. 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. The earthquake began at 1:12 p.m. Alaska local time, and was centered approximately 135 kilometers (84 miles) south of Fairbanks and 283 kilometers (176 miles) north of Anchorage. Fault creep Its epicenter was located on the Denali fault 22 km east of the M 7.9 event epicenter. The lowest elevations of Denali National Park are a combination of forests. USGS Fact Sheet 014-03: Rupture in South-Central Alaska — The Denali Fault Earthquake of 2002. 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. This National Park includes part of a massive mountain range more than 600 miles long. “Interferometry is a good way to locate faults and see which sections are susceptible to deformation,” said Evelyn Price, a research associate at the University of Texas Institute for Geophysics. Now considered a foreshock of the larger quake, the October earthquake caused no surface ruptures. Then the rupture transferred onto the main strand of the DFS and continued as a right-lateral strike-slip event for ~220 km until it … It is located near the center of the Alaska Range, with two summits rising above the Denali Fault, in south-central Alaska, U.S. Denali lies about 130 miles (210 km) north-northwest of Anchorage and some 170 miles (275 km) southwest of Fairbanks in Denali National Park and Preserve, which covers six million acres (24,281 square km) of land. 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. As a final tribute to the active tectonics of Alaska, a series of faults have fractured the park and most of the state in the last 100 million years. The additional weight of rocks and dirt can also cause greater pressure and melting at the base of the glacier, increasing the likelihood that a glacier may surge forward. Due to Alyeska’s earthquake protection, the Denali Fault earthquake did not compromise the integrity of the pipeline. The mountain is essentially a giant block of granite that was lifted above Earth’s crust during a period … No oil spilled, and pipeline operations resumed after minor repairs. In the past, scientists typically relied on SAR imagery from the European Remote Sensing (ERS) satellites, ERS-1 and ERS-2, to map earthquake deformation. The Denali Fault System. Denali Fault. Over the billions of years, the land broke apart and created what we recognize today. Water in pools, ponds, and bayous as far away as Texas and Louisiana splashed for nearly half an hour. At the highest elevations, you can spot snow, rock and glaciers. “It’s the first time this has ever been done in earthquake research. When Denali was remeasured in 2015, some believed that the mountain was shrinking due to … During the afternoon of November 3, 2002, the water in Seattle’s Lake Union suddenly began sloshing hard enough to knock houseboats off their moorings. Journal of Geophysical Research. Both quakes were centered along the Denali Fault. “And you can’t measure ground motion on the scale of millimeters over that kind of area unless you use interferometry.”. It was said that he named it after McKinley because of his support for the gold rush and gold standard. It illuminates earthquake mechanics and hazards of large strike-slip faults. Price and David T. Sandwell. “The less time between repeat orbits, the less chance there is for change on the Earth’s surface,” said Ford. The range is highest at its mid-section, a vast region of towering peaks and massive glaciers that lies within Denali National Park and Preserve. Andrew Ford, a researcher at the University of Utah, was studying the fault system in southeast Alaska with colleagues Rick Forster and Ron Bruhn, both professors at the University of Utah. However, that skin is not all in one piece, it is a… In addition, landslides completely covered parts of several Alaskan glaciers after the November 3 Denali Fault earthquake. The Denali Fault and other active faults in Alaska encroach on populated areas and critical infrastructure, including existing and proposed oil and natural gas pipelines. “ASF gave us priority. The Denali Fault is also known as a “strike slip” fault: where two pieces of continent rub against each other as they head in opposite directions. 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