It is convenient to view the fault as a single curve, but it is actually comprised of clusters of fault patterns. Alaska’s Denali Fault was on the move, jostling the state with a magnitude 7.9 earthquake. When Denali was remeasured in 2015, some believed that the mountain was shrinking due to … Ongoing tectonic processes are constantly shifting and changing the land. The quake was the largest on the Denali Fault since at least 1912 and among the strongest earthquakes recorded in North America in the last 100 years. The Denali-Totschunda fault is a major dextral (right lateral) strike-slip system, similar in scale to the San Andreas fault system. The resulting surface rupture was approximately 336 kilometers (209 miles) long, and it cut through streams, divided forests, opened chasms in roads, and even generated fault traces visible across several glaciers. 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. This is the location of the largest earthquake ever recorded in North America. [citation needed], 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. 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. 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. Measuring 7.9 in magnitude, the earthquake caused ground to shift beneath the pipeline 14 feet horizontally and 2.5 feet vertically. In 2015, the mountain was officially changed to the name that the locals always referred to it as; Denali. Abstract . Shaking at the epicenter lasted approximately 1.5 to 2 minutes, but in Fairbanks the duration of the earthquake was over 3 minutes. 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. 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 cause? 103(B11):27,001-27,016. No oil spilled, and pipeline operations resumed after minor repairs. 3. Once the satellite acquired the image we needed, ASF downloaded and formatted it, and it was ready for us within hours,” said Ford. 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. “When the earthquakes occurred, we wanted to see if we could determine how much ground motion there was,” said Ford. M7.9 Earthquake on November 3, 2002. It began with thrusting on the previously unrecognized Susitna Glacier fault, continued with right-slip … 1998. [4] 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. 40Ar/39Ar data from the Richardson mining district, Big Delta Quadrangle, Alaska - RDF 2020-11 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. You probably also know about the different layers of the Earth. Flight Center. The president was, however, from Ohio and never even visited the state of Alaska. Interferometry involves taking Synthetic Aperture Radar (SAR) satellite images from two different dates and precisely calculating the differences between the two. Journal of Geophysical Research. “ASF gave us priority. The November 3 Denali Fault earthquake was preceded by the magnitude 6.7 Nenana Mountain earthquake on October 23. 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