Starting on the Susitna Glacier Thrust Fault, the rupture raced along the Denali Fault System and continued 220 kilometers until it reached the Totschunda Fault, rattling 70 more kilometers. 1995). The slip rate of the Denali fault is 1 to 2 cm/yr during the Holocene (P age et al.
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. Its epicenter was located on the Denali fault 22 km east of the M 7.9 event epicenter.
Wallace et al.
The Totschunda fault is a 210-km-long splay of the Denali fault at its eastern end that strikes more southeasterly and is parallel Why is the Alaska Denali Fault more terrifying than the California San Andreas fault? Geologic map aids mitigation of earthquake damage in Alaska PDF version On November 3, 2002, the 800-mile long Trans-Alaska Pipeline pipeline was able to withstand the largest recorded earthquake for the Denali fault without spilling a drop of oil and with only 3 days shutdown time for inspections. The map offers zoom and scroll options, and multiple base map layers.
The Denali fault is the largest of the active faults associated with the Yak- utat collision. (2002) suggested that the northern part of the Totschunda fault system may consist of multiple dis- The eastern section of the Denali Fault did not rupture during the 2002 Denali Fault earthquake (Mw 7.9), however seismologic, geodetic, and geomorphic evidence along with a paleoseismic record of several past ground-rupturing earthquakes demonstrate the fault is active.
The M 7.9 Denali Fault event was preceded by the magnitude 6.7 Nenana Mountain event on October 23, 2002. The Totschunda fault branches away from the Denali fault, to the extensional side, at an angle of approximately 15 . A combination of strike-slip and reverse movement on these faults, as well as folding, characterizes the transpressional tectonic environment that effectively thickens the crust and contributes to the high average elevation of the Alaska Range. Ho w ever,w est of about 146 !W longitude, recent slip on the Denali fault diminishes; east of about 143 !W longitude, most of the recent slip is on the T otschunda branch rather than the extension of the Denali fault … Display MP 141 and MP 150 (pre-Quaternary) overlays together for the most accurate view. The Denali Fault System, Alaska If we’re talking sheer magnitude, the largest recorded earthquake on North American soil hit Alaska on November 3, 2002.
Click individual fault and fold traces to view basic fault parameters: name, age, slip rate, slip sense, … The angle was measured from a fault map of central Alaska provided by Savage and Lisowski (1991). Its total length is 1,700 km, and about 1,140 km of the fault has evidence for Quaternary move-ment (figure 3). Alaska’s accreted terranes are bounded by faults, including the Denali fault which runs along the north side of the Alaska Range.
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