denali fault earthquake 2002
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 ... 2156 Koyukuk Drive, PO Box 757320, Fairbanks, AK 99775. The rupture then jumped to the main Denali Fault strand propagating for a further 220 km (137 mi) before jumping again onto the Totschunda Fault and rupturing another 70 km (43 mi) of fault plane. This quake lasted over three minutes! also continuation of rupture along the Denali fault at a speed slower than that along the Totschunda fault and with smaller slip. Slip histories for the 2002 M7.9 Denali fault, Alaska, earthquake are derived rapidly from global teleseismic waveform data. We use a spectral-element method implemented on the Earth Simulator in Japan to simulate broadband seismic waves generated by the 3 November 2002 Denali fault earthquake. Waveform modeling indicates that 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- Right-lateral slip drops dramatically from about 5 m to about 2 m across the broad stepover For more photos, see our. 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 ... The earthquake began about 80 km (50 miles) east of the Denali Visitor Center, and ruptured eastward along the Denali Fault, and was followed . An Mw7.9 strike slip earthquake struck on November 3, 2002, in central Alaska, rupturing 325 km of the Denali fault and two other faults. along the newly recognized Susitna Glacier fault. In phases, three models improve matching waveform data and recovery of r. The epicenter of the November 3 earthquake was approximately 42 miles (68 km) east of the highway. 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. Shortly after midday on November 3, 2002, a magnitude 7.9 earthquake ruptured the Denali Fault in the rugged Alaska Range, about 90 miles south of Fairbanks. Introduction A M w 7.9 earthquake struck central Alaska on 3 No-vember 2002. The source model is constrained by teleseismic body waves and . There is evidence of local supershear propagation inferred from ground motions.[10]. Our helicopter-supported reconnaisance investigations over a week-long period revealed three large ruptures 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. The was associated with 340 kilometers of surface rupture and was the largest aftershock zone terminates ⬃10 km west of strike-slip earthquake in North America in . similar to the southern segments of the San Andreas fault in California. fault, Tibet. The epicenter was located west of Nenana Mountain on the Denali fault, 2.6 miles (4.2 km) beneath the ground surface. In Alaska, moving from east to west, the plate interactions change from a transform boundary between Pacific and North American plates to a collision zone with a microplate, the Yakutat terrane, which is in the process of being accreted to the North American plate, to a destructive boundary along the line of the Aleutian islands. 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 . Rupture of Denali fault responsible for magnitude 7.9 Alaskan earthquake of November 3. The November 3rd earthquake was preceded by a Mw 6.7 foreshock on October 23, 2002 (Nenana Mountain earthquake) Although it occurred at a time when a wealth of digital instruments were . The earthquake of November 3 (magnitude 7.9) appears to be a realization of the postulated . The recurrence intervals for these two faults were estimated as 700 and 400 years respectively. Freed et al. Phone: (509) 963-2701 / UAF is an AA/EO employer and educational institution and prohibits illegal discrimination against any individual. The Nenana Mountain and Denali Fault earthquakes generated a vigorous aftershock sequence. of the great California earthquakes of 1906 and 1857 and last year's Kokoxili earthquake along the Kunlun This is the first book to integrate scientific, social, and economic issues related to disasters such as hazard identification, risk analysis, and planning, relevant hazard process mechanics, discussions of preparedness, response, and ... Alaska hazard map It illuminates earthquake mechanics and hazards of large strike-slip faults. These waves generate a secondary The recurrence intervals for these two faults were estimated as 700 and 400 years respectively. This 7.9 Mw earthquake was the largest recorded in the United States in 37 years (after the 1965 Rat Islands earthquake). "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. Prepared by the Earthquake Investigations Committee of the Technical Council of Lifeline Earthquake Engineering ASCE. The shock was the strongest ever recorded in the interior of Alaska. Deborah and Hess rise to about 12,000 feet (3650 m) just north of the epicenters and the bend in the Denali fault. This was never more evident than in the fall of 2002, when two large earthquakes occurred. 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. November 19, 2002. and Totschunda faults, we model the . This work was undertaken because much research in volcano seismology is needed to help in hazard assessment. 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. 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, ... I called the local station between the main quake and the firs. The onslaught of the data has created processing delays. 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. Found inside – Page K-422... 2002 Second subevent Third subevent Pump Station 10 ( PS - 10 ) — Location of strong - motion seismograph that recorded the Denali Fault earthquake ... Found inside – Page 42Active Fault Field Studies Studies of the relationship of tectonics ... on seismic safety issues following November 3 , 2002 Denali Fault Earthquake . 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. Rupture of Denali fault responsible for magnitude 7.9 Alaskan earthquake of November 3. Hayes. The Denali-Totschunda fault is a major dextral (right lateral) strike-slip system, similar in scale to the San Andreas fault system. 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 largest earthquake recorded on the Denali Fault was a M7.9 on November 3, 2002. 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 ... EERI Special Earthquake Report — February 2003 Learning from Earthquakes Preliminary Observations on the November 3, 2002 Denali Fault, Alaska, Earthquake This report is based on data collect- ed after the earthquake by a num-ber of teams and individuals, and compiled by John Aho of CH2M Hill in Anchorage, Alaska. 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 earthquake ruptured on three faults, one of which was unknown. EERI Such compound disasters can strike any earthquake-prone populated area. National Earthquake Resilience presents a roadmap for increasing our national resilience to earthquakes. Dept of Geological Sciences / 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 book's publication near the beginning of the National Science Foundation's EarthScope project makes it especially timely because Alaska is perhaps the least understood area within the EarthScope footprint, and interest in the region can ... The M 7.9 Denali Fault event was preceded by the magnitude 6.7 Nenana Mountain event on October 23, 2002. The 2002 M7.9 Denali fault, Alaska, earthquake triggered thousands of landslides, primarily rock falls and rock slides, that ranged in volume from rock falls of a few cubic meters to rock avalanches having volumes as great as 15×10 6 m 3.The pattern of landsliding was unusual; the number of slides was less than expected for an earthquake of this magnitude, and the landslides were concentrated . [5] Due to the remote location, there were no fatalities and only one injury. 2003). Sub-event 1 occurred 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- 4 and 170 miles north of Anchorage, Alaska (Figure 1). [12] The pipeline was shut down for three days to allow for inspections but was then reopened. 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. The Denali fault earthquake that struck central Alaska area on November 3, 2002 ranks among the largest The Denali fault is characterized by infrequent large earthquakes, The Denali fault earthquake that struck central Alaska area on November 3, 2002 ranks among the largest strike-slip ruptures of the past two centuries. (1) be equal to v 0, such that the initial stress before the earthquake is τ 0 . South face, Mt. Finite Source Modeling of Great Earthquakes Douglas Dreger Introduction. 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. Stresses are estimated in three regions along the Denali fault, one of which also includes the Susitna To analyze the effect of fault branches on dynamic rupture propagation we numerically simulated the observed dynamic slip transfer from the Denali to Totschunda faults during the M w 7.9, November 3, 2002, Denali fault earthquake, Alaska ... Of up to 15 mm were measured at permanent gps stations in central Alaska on November (! Denali National Park are not available 2002 earthquake fault mainshock by 3.5 hours two major earthquakes, similar the. 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