Dept of Geological Sciences / For more photos, see our, Measuring surface offset. also continuation of rupture along the Denali fault at a speed slower than that along the Totschunda fault and with smaller slip. This Mw =7.9 event is the largest strike-slip earthquake in North America in almost 150 years. • It will take ~9 more years for seismicity to go back to the background level. EERI Seismological Aspects of the 2002 Denali Fault, Alaska, Earthquake Roger A. Hansen, M.EERI; ; November 19, 2002. The 2002 Denali Fault, Alaska earthquake and four years of contin-ued postseismic deformation were well recorded with campaign and continuous GPS data (e.g. The November 3, 2002 Denali, Alaska earthquake was of keen interest to geologists, glaciologists, and seismologists. Sub-event 1 occurred Due to the general self-sufficiency of those living near the fault rupture, very few lifeline systems were compromised. Measuring 7.9 in magnitude, the earthquake caused ground to shift beneath the pipeline 14 feet horizontally and 2.5 feet vertically. Found inside – Page 1222b suggest that the next major M[7.0 earthquake could occur on the Carrizo reach of ... (2003), The 2002 Denali Fault Earthquake, Alaska: A Large Magnitude, ... 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. This was the footage that was seen all-over the world! Found inside – Page 445ing the 3 November 2002 Denali Fault earthquake. ... J Geophys Res. doi:108:10.1029/ 2002JB001805 Pollitz FF, Johnston MJS (2006) Direct test of ... gion surrounding the 2002 Denali fault earthquakes. The Nenana Mountain and Denali Fault earthquakes generated a vigorous aftershock sequence. This work was undertaken because much research in volcano seismology is needed to help in hazard assessment. In response to the magnitude 6.7 and 7.9 events, the Alaska Earthquake Information Center (AEIC) staff installed a network of temporary instruments for the aftershock monitoring. southeast on the Totschunda fault. Such compound disasters can strike any earthquake-prone populated area. National Earthquake Resilience presents a roadmap for increasing our national resilience to earthquakes. The dashed black/white curves denote the extent of the 2002 Denali earthquake rupture surface. The 2002 Denali earthquake occurred at 22:12:41 UTC (1:12 PM Local Time) November 3 with an epicenter 66 km ESE of Denali National Park, Alaska, United States. Until recently, seismic inversions have revealed most earthquakes to be sub-Rayleigh. A magnitude 4.4 foreshock preceded the Denali Fault mainshock by 3.5 hours. The view shows the approximate location of the epicenter of the magnitude 6.7 earthquake that occurred in the early morning of October 23, 2002. strike-slip ruptures of the past two centuries. We construct a spontaneously propagating rupture model exhibiting these features and use it to explain ground motions recorded during the 2002 Denali fault earthquake at pump station 10, located 3 km from the fault. 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. No surface rupture was associated with the October 23rd event. The slip rate of the Denali fault is 1 to 2 Both foreshock and mainshock resulted from slip on the Denali fault system, which is an arcuate right-lateral strike-slip fault acting as a major boundary between accreted litho-tectonic terranes [Plafker and Berg, 1994]. In response to the magnitude 6.7 and 7.9 events, the Alaska Earthquake Information Center (AEIC) staff installed a network of temporary instruments for . It illuminates earthquake mechanics and hazards of large strike-slip faults. 170 km from the epicenter. 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. There were reports of triggered seismicity in volcanic and geothermal centers in Washington and California and regional seismicity in Utah. The Denali fault is a major fault that follows an arcuate trace across southern Alaska, following the Alaska Range for much of its length. The AEIC located over 1,000 aftershocks of the M 6.7 event prior to the M 7.9 mainshock and over 35,000 aftershocks through the end of 2004. This quake lasted over three minutes! Fault surface rupture in snow. Found inside – Page 168CLUES FROM THE RECENT DENALI M7.9 EARTHQUAKE The November 3, 2002, M7.9 Denali fault earthquake marked the largest recorded seismic event in central Alaska ... Our current concepts about fault rupture propagation, surface faulting, These waves generate a secondary The epicenter of the November 3 earthquake was approximately 42 miles (68 km) east of the highway. "Fact Sheet 014-03: Rupture in South-Central Alaska—The Denali Fault Earthquake of 2002", "M 7.9 Denali Fault earthquake of November 3, 2002", "The 2002 Denali Fault Earthquake, Alaska: A Large Magnitude, Slip-Partitioned Event", "Evidence for a Supershear Transient during the 2002 Denali Fault Earthquake", Effect of the Denali Fault Rupture on the Trans-Alaska Pipeline, M 7.9 Denali Fault earthquake of November 3, 2002, https://en.wikipedia.org/w/index.php?title=2002_Denali_earthquake&oldid=1041490958, 2002 natural disasters in the United States, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, This page was last edited on 30 August 2021, at 20:42. At that point, it right-stepped onto the more south-easterly trending Totschunda fault and stopped after rupturing nearly 70 km of it. between the Denali and Totschunda faults; rupture continues to the southeast for about 75 km. The 2002 M6.7 Nenana Mountain and M7.9 Denali fault earthquake sequence oc-curred on a major right-lateral strike-slip fault system in central Alaska in response to the oblique collision between the Yakutat terrane and the North American continental margin (Lahr and Plafker 1980); see Figure 1. The epicenter was located west of Nenana Mountain on the Denali fault, 2.6 miles (4.2 km) beneath the ground surface. 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. Rupture of Denali fault responsible for magnitude 7.9 Alaskan earthquake of November 3. 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 reached the Totschunda fault near 143W longitude. The 3 November 2002 MW 7.9 Denali fault earthquake provided an excellent opportunity to investigate triggered earthquakes at Alaskan volcanoes. Fax: (509) 963-2821 / Found inside – Page 44Geology of the study area and seismicity associated with the 2002 Denali fault earthquake. Geology simplified from Ridgway et al. (2002). The 2002 Denali Fault earthquake was among the largest earthquakes recorded in the United States. 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. Found inside – Page 83... Denali ( Alaska ) USE McKinley , Mount ( Alaska ) Denali Earthquake , Alaska , 2002 USE Denali Park Earthquake , Alaska , 2002 Denali Fault Earthquake ... Having rumbled such a large area of Alaska, it is quite remarkable that the Denali quake caused as little damage as it did. the 2002 Denali Fault Earthquake Eric M. Dunham and Ralph J. Archuleta To appear in BSSA Abstract Elastodynamic considerations suggest that the acceleration of ruptures to supershear velocities is accompanied by the release of Rayleigh waves along the fault from the stress breakdown zone. There was no oil spillage, as the pipeline at that location was designed to move laterally along beams to withstand major movement on the Denali Fault. Found inside – Page 219(continued) Earthquake Magnitude Epicentral Distance (km) Focal Depth (km) ... 2002 M7.9 Denali fault earthquake, Earthquake Spectra, Special Issue on the ... Evidence for a Supershear Transient during the 2002 Denali Fault Earthquake Eric M. Dunham, & Ralph J. Archuleta Published December 2004, SCEC Contribution #864 Elastodynamic considerations suggest that the acceleration of ruptures to supershear velocities is accompanied by the release of Rayleigh waves along the fault from the stress breakdown zone. The Denali-Totschunda fault system is one of the structures that accommodate the accretion of the Yakutat terrane. Introduction A M w 7.9 earthquake struck central Alaska on 3 No-vember 2002. Denali earthquake November 3, 2002 340 km long Strike-slip fault M7.9 - Alaska Denali earthquake November 3, 2002 340 km long Strike-slip fault M7.9 - Alaska Denali earthquake High hazard, but Low risk as little vulnerability and exposure M7.9 - Alaska The principal rupture was a 210-kilometer-long section of the Denali Focal mechanisms are from Har-vard Centroid Moment Tensor; the yellow and red stars indicate the epicenters of the 23 October and 3 November mainshocks respectively (Alaska Earth- 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. EERI Our initial observations reveal three distinct surface breaks with a combined Email: chair@geology.cwu.edu Multiple land slides and rock avalanches occurred in the Alaska Range with the largest slide on the Black Rapids Glacier. Found inside – Page 256''The 2002 Denali Fault Earthquake, Alaska: A Large Magnitude, Slip-Partitioned Event,'' Science 300 (2003): 1113–1118. Haeussler, Peter J., and George ... Many Alaskans now have a vivid memory of where they were on Sunday, Nov. 3, when the world s largest earthquake so far in 2002 rocked the state. On October 23, people of Interior Alaska were awakened to strong shaking caused by a magnitude 6.7 earthquake. In the distance, the rugged peaks of Mts. On October 23, 2002, there was a magnitude 6.7 earthquake located on the Denali fault. The epicenter of the main shock was located about Denali fault and surrounding area showing surface ruptures associated with the 2002 earthquake and outlines of subregions. Found inside – Page 42Active Fault Field Studies Studies of the relationship of tectonics ... on seismic safety issues following November 3 , 2002 Denali Fault Earthquake . ing the 2002 earthquake, the Denali fault has been a target of paleoseismic investigations and represents the largest seis-mogenic source for interior Alaska (Wesson et al., 2007). I called the local station between the main quake and the firs. The Denali Fault is a major intracontinental right-lateral strike-slip fault that partially accomodates the oblique collision of the Yakutat block into Alaska's margin, extending from northwestern British Columbia to the central and western regions of Alaska. 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. Found inside – Page 243 , 2002 , magniTrans - Alaska Pipeline were elevated above tude - 7.9 central ... With the pipeline Denali Fault earthquake played a role in ensurintact ... I called the local station between the main quake and the firs. Found inside – Page 226Dunham, E. M., and R. J. Archuleta (2004), Evidence for a supershear transient during the 2002 Denali fault earthquake, Bulletin of the Seismological ... It began with thrusting on the previously unrecognized Susitna Glacier fault, continued with right-slip on the . The earthquake of November 3 (magnitude 7.9) appears to be a realization of the postulated . 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 below). 4 and 170 miles north of Anchorage, Alaska (Figure 1). This was never more evident than in the fall of 2002, when two large earthquakes occurred. This ancient [6] About 20 houseboats were damaged by a seiche on a lake in Washington State.[6]. Following the Denali Fault earthquake, the analyst processing load increased from an average of 40 events per day in September to an average of over 400 events per day in November. The earthquake initiated as a thrust event on the previously unrecognized Susitna Glacier Fault (SGF) and . (1) be equal to v 0, such that the initial stress before the earthquake is τ 0 . Of the population centers, the hardest hit were the villages of Mentasta and Northway, located at the eastern end of the rupture zone. November 3, 2002 Denali fault earthquake, which is the largest inland event known to occur in central Alaska. We searched for evidence of triggered seismicity by examining the unfiltered . Measuring surface offset. Its epicenter was located about 40 miles east of Denali National Park . Hayes. THE DENALI FAULT EARTHQUAKE On the afternoon of 3 November 2003, a M7.9* earthquake ruptured the Susitna Glacier fault, the Denali fault, and the Totschunda fault. This volume brings together, from a wide range of experience, such information as may be useful in recognizing, avoiding, controlling, designing for, and correcting movement. the Denali fault. 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 earthquake also demonstrated the benefits of the multi-tiered earthquake preparedness and response strategy in place at the time of the earthquake. That's about 300 times faster than before the earthquake. The probabilistic seismic hazard map of Alaska completed in 1998 estimated the hazard from magnitude 8.0 and 7.7 characteristic earthquakes on the central Denali and Totschunda Faults, respectively. The Denali earthquake ruptured three fault segments shown in Figure 1 . It was the main fault along which the 2002 Denali earthquake occurred, which was measured as a magnitude of 7.9 M w. During the afternoon of November 3, 2002, the water in Seattle's Lake Union suddenly The initial rupture on November 3 was on a thrust fault segment, the previously unknown Susitna Glacier thrust,[7][9] to the south of the Denali fault. The magnitude 7.9 earthquake that occurred in south-central Alaska on November 3, 2002 ruptured a 336-km long segment of the Denali Fault. The three panels show the calculated change in the S xx , S xy , S yy . 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. South face, Mt. The Trans-Alaska Pipeline suffered some damage, but no oil spills occurred. In the left foreground, the Nenana River marks the eastern boundary of Denali National Park. In 1932, three earthquakes (magnitude 6.0, 6.9 and 6.0) occurred on western part of The 2002 Denali earthquake occurred at 22:12:41 UTC (1:12 PM Local Time) November 3 with an epicenter 66 km ESE of Denali National Park, Alaska, United States.This 7.9 M w earthquake was the largest recorded in the United States in 37 years (after the 1965 Rat Islands earthquake).The shock was the strongest ever recorded in the interior of Alaska. "The technique of speckle tracking can provide coseismic surface offsets for an earthquake in regions where other geodetic data are not available. Introduction [2] On 3 November 2002, an M W 7.9 earthquake occurred on the Denali fault, central Alaska. This event was followed by numerous aftershocks that defined a 45- The MW (moment magnitude) 7.9 Denali fault earthquake on 3 November 2002 km-long zone along the Denali fault. northern block of the Denali Fault moved toward E15°S,this amount of line-of-sight dis-placement corresponds to about 140 cm Deformation of the 2002 Denali Fault Earthquakes,Mapped by Radarsat-1 Interferometry PAGES 425,430-431 Fig.1.Radarsat-1 interferogram showing the displacement over the western part of the 340-km- This was never more evident than in the fall of 2002, when two large earthquakes occurred. The data demonstrate that National Earthquake Hazards Reduction Program Evidence for a Supershear Transient during the 2002 Denali Fault Earthquake S261 Because the station is located only 3 km from the Denali initial stress level is selected such that the rupture is sub- fault and many tens of kilometers from the Susitna Glacier Rayleigh, and no healing is used initially. Waveform modeling indicates that Press release: Mw 7.9 Denali Fault Right-lateral slip drops dramatically from about 5 m to about 2 m across the broad stepover UAF is an AA/EO employer and educational institution and prohibits illegal discrimination against any individual. GPS geodetic measurements are used to study two major earthquakes, the 2001 MW 7.7 El Salvador and 2002 MW 7.9 Denali Fault earthquakes. Its epicenter was located on the Denali fault 22 km east of the M 7.9 event epicenter. During the summers of 2012 and 2015, we developed a new paleoseismic site, the Dead Mouse site, located on the west-central segment of the Denali fault near the south- fault, Tibet. and Totschunda faults, we model the . This November 2002 earthquake was one of the largest ever recorded on U.S. soil, and occurred on the Denali-Totschunda fault system, which is one of the longest strike-slip fault systems in the world and rivals in length California's famed San Andreas strike-slip fault system that spawned the destructive M 7.8 San Francisco earthquake in 1906. 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. A team of geologists surveyed the total length of the ruptured faults and reported maximum vertical offsets on the Susitna Glacier Thrust of 4 m and maximum horizontal offsets of 8.8 m west of the Denali and Totschunda fault junction. of the great California earthquakes of 1906 and 1857 and last year's Kokoxili earthquake along the Kunlun thrust fault, named the Susitna Glacier fault. Distinguishing between different mechanisms of postseismic deformation (e.g., afterslip, viscoelastic relaxation) remains a challenging problem for many . Finite Source Modeling of Great Earthquakes Douglas Dreger Introduction. Inset shows the larger regional setting. November 14, 2002 / Ned Rozell. Coseismic displacements of up to 15 mm were measured at permanent GPS stations in Central America. Called the Denali Fault earthquake, this M7.9 Denali fault earthquake epicenter (November 3, 2002) S u s i t n a G ll aa c i eer W e s t F o r k G l a c i e r S u s i t n a G l a c i r 0 20 40 149oW 148 oW 147 W 63oN 64oN 0250km-40-20-60 Denali H ighway Parks Highway M7.9 Denali fault earthquake epicenter (November 3, 2002) M6.7 Nenana Mountain earthquake epicenter (October 23, 2002 . 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. fault, with horizontal shifts of up to nearly 9 meters (26 feet). Found inside – Page 42Fuis, G.S. & Wald, L.A., Rupture in South-Central Alaska—The Denali Fault Earthquake of 2002, USGS, Fact Sheet 014-03, 2003, ... There were large surface fault offsets through land as well as across the surface of glaciers. A T eleseismic Study of the 2002 Denali Fault, Alaska, Earthquake and Implications for Rapid Strong-Motion Estimation Chen Ji,a) Don V .Helmber ger,a) and Da vid J.W ald, b) M.EERI Slip histories for the 2002 M7.9 Denali fault, Alaska, ear thquak e are de- The Alaska Volcano Observatory operates short-period seismic networks on 24 historically active volcanoes in Alaska, 247-2159 km distant from the mainshock epicenter. The estimated magnitude of this earthquake ranges from the body wave magnitude mb of 7.0 to the moment magnitude MW of 7.9 to the surface wave magnitude MS of 8.5. The recurrence intervals for these two faults were estimated as 700 and 400 years respectively. 135 km south of Fairbanks. Interpretation of a trench excavated across the 2002 rupture trace places a constraint on the timing of the penultimate earthquake to after 550 to 660 yr before 2002, consis - tent with other paleoseismic studies along the central Denali fault. The M w 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 . This was the footage that was seen all-over the world! Map & Directions, South face, Mt. Due to the remote location, there were no . The M 7.9 Denali Fault event was preceded by the magnitude 6.7 Nenana Mountain event on October 23, 2002. Here, vertical displacements average about 1.5 m and peak at 4-5 m. The 2002 Mw7.9 Denali fault earthquake was among the largest intraplate earthquakes on record, and the ongoing crustal deformation of the event is still observed today. The Denali Fault quake was a monster — the largest inland earthquake in North America in nearly 150 years — and its west-to-east shockwave was powerful enough that it was felt as far away as . rupture length of about 320 km. along the Denali fault. Denali Fault Earthquake a Once-in-a-Lifetime Event. This event caused significant damage to the transportation systems in central Alaska. 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South-Easterly trending Totschunda fault and the red line is the largest inland in. Seismicity by examining the unfiltered prepared by the earthquake caused ground to shift beneath pipeline... Rupture was associated with the October 23rd event geothermal centers in Washington and caused seiches in and. The three panels show the calculated change in the Denali fault 22 km east of Denali National.... Three panels show the calculated change in the distance, the 2001 Mw 7.7 Salvador... 170 miles North of the Nenana Mountain earthquake were the two magnitude events! In future earthquakes in earthquake of November 3 ( magnitude 7.9 Alaskan earthquake of 2002, there no! As Texas and Louisiana east across the pipeline was shut down for three days to allow for but...
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