denali fault location

fault without continuation along the Denali fault. (A) Location map showing topography of the Alaska Range and the 2002 Denali fault earthquake rupture (red). In: Yukon Geology Volume 2, J.G. In that exceptional case there is also continuation of rupture along the Denali fault at a speed slower than that along the Totschunda fault and with smaller slip. Figure 3: This map shows the location of the Denali Fault and its curved shape. Land south of the faults moves to the west relative to the north at a rate of about 1 centimeter per year. GPS data indicate 8 to 9 mm/year slip on the Denali fault … Fault and two along the main Denali Fault. Figure 3: This map shows the location of the Denali Fault and its curved shape. Even though the earthquakes occurred in a sparsely populated area, scientists are keeping an eye on the Denali Fault because of its similarities to the San Andreas Fault, located near heavily populated areas in California. For the Susitna Glacier Fault segment,inter-ferograms (Figures 1 and 2a) contain coherent data close to the fault rupture,and hence the best fit fault geometry,location and slip were solved.The best-fit uniform slip model has 7 m of slip on the Susitna Glacier Fault at depth, This contributes to further mountain building, as lateral movement along the fault makes land pile up (US.NPS-1). Denali happens to be in … Location of the Denali fault earthquake epicenter (star) along with 1-Hz GPS sites used in this study. Because of its location close to the November 3 event and the fact that it preceded it by only 11 days, this earthquake is regarded as a foreshock that probably directly triggered the main shock.. Slip rate on the Denali fault since the last glaciation (10,000 years before present) has averaged about 10 mm/yr. The rupture has been estimated to move along the fault at approximately 3.3 km/sec [ Dreger et al. Slate Creek paleoseismic trench sites and Boulder Moraine offset site are labeled with black stars on the west and east sides of , 2002 ] and the expected group velocity of acoustic waves is taken to be near 0.30 km/sec. 3.1 Location of the Denali Fault and Lithospheric Strength Contrasts. Radarsat track used in this study is shown as a grey box. The uplift of Denali National Park and Preserve is caused by the collision of tectonic plates as well as its location along a prominent fault. The fault is curved just North of the mountain of Denali. This is the largest earthquake on the Denali fault since at least 1912, when a M 7.2 earthquake occurred in the general vicinity of the fault, more than 80 km to the east of the November 3rd epicenter. . Location. The Alaska Earthquake Information Center linked the location and mechanism to the rupture of multiple faults, and mainly the right-lateral Denali Fault, which is part of a system of active intra-continental strike-slip faults accommodating contemporary slip rates of 8–9 mm yr −1 along the North American–Pacific plate boundary. Fault geometry, slip distributions and waveform fits for the Phase I model. Studies of the fault at various locations have yielded a wide range of slip rates, but the best estimates generally converge on a maximum rate of about 10 mm/yr. The Alaska Pipeline is on the left. The rupture initiated with slip on a previously un-known thrust fault, the 40 km long Susitna Glacier fault (SGF). Photo credit. 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. Surface rupture associated with the 1912 M w 7.2–7.4 Delta River earthquake (Carver and others., 2004 #7724) and the 2002 M w 7.9 Denali earthquake occurred on the central part of the fault. a) Catalog locations for earthquakes occurring in the northern study area between September 9, 1973 and October 25, 2002, the day prior to the start of the Denali fault sequence. Witter, J.B., 2020. Location of the Denali Fault earthquake rupture (bold line) through the Alaska Range. The distribution of liquefaction effects depended also upon the location of suscep-tible deposits with respect to the fault. 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. (b) 2002 Denali Earthquake Sequence showing location of M6.7 Nenana Mountain Earthquake and M7.9 Denali Fault Earthquake and associated aftershocks (after Fuis & Wald 2003). This earlier earthquake and its zone of aftershocks were located ~20 km to the west of the 7.9 quake. This National Park includes part of a massive mountain range more than 600 miles long. The inset on the right shows the surface fault rupture, locations of FAIR and 8022, and the Harvard centroid moment tensor (CMT) focal mechanism for the earthquake. The largest earthquake ever recorded on the Denali fault system (magnitude 7.9) struck central Alaska on November 3, 2002. The surface offset at this location was approximately 16 feet (almost 5 meters). Our Mission. It illuminates earthquake mechanics and hazards of large strike-slip faults. The entire system connects with the Queen Charlotte fault and the Fairweather fault of southeastern Alaska toward British Columbia, forming a significant piece of the transform fault boundary between the Pacific and North American plates. The Denali Fault is a long, tectonically active region that snakes through Alaska’s southern interior. (2004). Range is adjacent to the Denali fault, and the high topography of the range may be related to thrust faults that merge into the Denali fault at depth (5, 6). The largest earthquake ever recorded on the Denali fault system (magnitude 7.9) struck central Alaska on November 3, 2002. Road offset reveals Denali fault location. They are the Denali Fault and the Hines Creek Fault. Epicenter (star) of initial thrust rupture of the Susitna Glacier fault is located at the Earthquake characteristics. A geological fault is where significant amounts of rock have been displaced, and there is such a fault (aptly named the Denali fault) that has a bend where Denali … Microearthquake Seismicity on the Duke River, Denali Fault System. The location map of the study site of Denali Fault line in southwest Yukon. 1 A map of interior Alaska showing the location of the epicenter of the 3 November 2002 earthquake. Early-stage exploration for geothermal energy resources along the Denali fault near Duke River, Yukon. It was preceded by a magnitude 6.7 earthquake on October 23. DF—Denali Fault; TF—Totschunda Fault; SGF—Susitna Glacier Fault. Location of the 2002 Denali Fault earthquake rupture (blue line). Across much of south‐central Alaska, the active intracontinental‐scale Denali fault lies largely within a narrow Mesozoic suture between two large composite terranes (YCT and WCT) (Figure 1). Image courtesy of the USGS. Offsets of poorly dated Quaternary fea-tures suggest the Denali fault slip rate is 8 to 13 mm/year (7). Continuous GPS stations are shown in green, campaign GPS stations in red. From providing information related to oil and mineral discoveries to helping after fatal landslides, Division of Geological & Geophysical Surveys staff continue their dedicated efforts to stimulate our economy, and protect our residents. the Denali fault earthquake induced debris flows, lateral-spreading ground failures, sand boils and fissures. This contributes to further mountain building, as lateral movement along the fault makes land pile up (US.NPS-1). These deposits, mainly alluvium, were along the Introduction A M w 7.9 earthquake struck central Alaska on 3 No-vember 2002. Denali Fault System The Denali fault system is a 2,100-km- (1,300-mi)-long structure, trending from the Yukon border southwest toward the Bering Sea. Power, M.A., 1988. The part of the pipeline designed to withstand movement along the Denali fault is in the middle part of the photograph. On October 23, 2002, there was a magnitude 6.7 earthquake located on the Denali fault. A large bend in the Denali Fault directly north of Denali causes rocks to bunch up. The top panel shows the surface projection of the Phase I fault model (box). The fault is curved just North of the mountain of Denali. This earlier earthquake and its zone of aftershocks were located slightly to the west of the 7.9 quake. The stars show the PDE and AEIC locations, and a focal mechanism shows the Harvard CMT solution for the Denali fault earthquake. Denali fault system (Fig. The Denali Fault is located in Alaska's Denali National Park and to the east. The distance from Fairbanks to the Denali fault along a 140 degree azimuth (point ‘C’) is approximately 225 km and the distance along the fault from the epicenter is approximately 150 km. Gray shading indicates the extent of rupture along the Totschunda fault during the Denali fault mainshock from Haeussler et al. This location is near where supports to the Trans Alaska Pipeline sustained damage. Accordingly, a 6-m displacement would require 600 years of strain accumulation. 1), with right-lateral offsets of up to 9 m observed at the surface (Eberhart-Phillips et al., 2003). Observations along the fault indicate that the north side of the Denali fault moved to the east and vertically up relative to the south side [ , 2002 ; , 2003 ]. Richardson Highway on right, looking north. The M w 7.9, 2002 November 3, Denali Earthquake was the largest strike-slip earthquake in … The Denali fault earthquake (DFE) occurred It was preceded by a magnitude 6.7 foreshock on October 23. 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.. Earthquake induced debris flows, lateral-spreading ground failures, sand boils and fissures,! 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