denali fault line map

denali fault line map

Most people in Interior Alaska were reminded of the fault’s earthquake potential when it ruptured on November 3, 2002. The Denali fault is an active intraplate dextral strike-slip fault. The Denali Fault, the fastest moving and most active fault in Interior Alaska, cuts through the heart of the Alaska Range and Denali National Park and Preserve. An online map of United States Quaternary faults (faults that have been active in the last 1.6 million years) is available via the Quaternary Fault and Fold Database.

Dashed yellow line is generalized trace of the eastern Denali fault. 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. Andrew Ford, a researcher at the University of Utah, was studying the fault system in southeast Alaska with colleagues Rick Forster and Ron Bruhn, both professors at the University of Utah.
Measuring the 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). Image courtesy of the USGS. The cause? Glaciers tend to flow down fault lines, eroding the ground surface and acting as conveyor belts for rock material. Price and David T. Sandwell. By further studying and understanding the kind of deformation that split open the ground surface in Alaska, scientists hope to glean clues about earthquake damage potential along the San Andreas Fault. 1998.

The fault runs through the mountains west to east and then curves south along the path of the Alaska Highway. In Alaska, digital elevation models based on light detection and ranging and interferometric synthetic aperture radar data enabled our fault mapping at scales of 1:2,000 and 1:10,000, respectively.

Seismicity in interior Alaska north of the Denali fault is dominated by shallow events (see blue dots on map above). The resulting image, called an Seismologic, geodetic, and geomorphic evidence, along with a paleoseismic record of past ground-rupturing earthquakes, demonstrate Holocene and contemporary activity on the fault, however.

(Submitted by Andrée Blais-Stevens) comments. 2017-1049 Small-scale deformations associated with the 1992 Landers, California, earthquake mapped by synthetic aperture radar interferometry phase gradients. Note also, that Alaska is not behaving as one rigid plate. In that respect, RADARSAT-1 had an advantage over the ERS missions. According to Ford, “The Denali Fault earthquake was the ‘big one’ for Alaska.” The cracks in the Earth’s surface along parts of the fault were up to 6.7 meters (22 feet) wide, which would have caused considerable damage to a more heavily populated area, such as California. 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. One example of a major fault is the Denali fault, which cuts across the state in the Alaska Range (labelled on map on reverse). 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 image is from This is a USGS produced shake map, which shows the relative magnitudes of ground shaking during the 2002 earthquake. Terrace riser from incised glacial outwash fan is offset 75 to 80 m (tr to tr′). Image from http://pubs.usgs.gov/fs/2003/fs014-03/shakemap.html. 1), with right-lateral offsets of up to 9 m observed at the surface (Eberhart-Phillips et al., 2003). Note how the blue dots scattered at the top of the map track roughly northeast-trending parallel lines. In the past, scientists typically relied on SAR imagery from the European Remote Sensing (ERS) satellites, ERS-1 and ERS-2, to map earthquake deformation. High precision Global Positioning System (GPS) surveying can now measure positions of survey points with a precision of a few millimeters.

Now considered a foreshock of the larger quake, the October earthquake caused no surface ruptures. Also, the details of the mechanics of uplift are of interest.

Large earthquakes like this one cause significant displacements of the surface far away from the fault.Although people tend to view the Earth as static and stable between earthquakes, every point is actually moving slowly as Earth’s tectonic plates move around. Tectonic setting for the Denali fault. Is this a flower structure of some sort, or does some other architecture exist. Every pair of SAR images used in the past has straddled both the major foreshocks and the mainshock. The Denali fault is an active intraplate dextral strike-slip fault. “When the earthquakes occurred, we wanted to see if we could determine how much ground motion there was,” said Ford. browser may not display or print as intended.
“RADARSAT-1 repeats its orbit every 24 days, whereas ERS-1 and ERS-2 repeated every 35 days,” said Ford.

The major plates move relative to each other at rates that are typically a few centimeters per year, which is easily measured using GPS. According to Ford, “The Denali Fault earthquake was the ‘big one’ for Alaska.” The cracks in the Earth’s surface along parts of the fault were up to 6.7 meters (22 feet) wide, which would have caused considerable damage to a more heavily populated area, such as California.

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