Images

View north of Denali fault trace at Gillette Pass. this view shows that the surface rupture reoccupies the previous fault scarp. Also the right-lateral offset of these stream gullies has developed since deglaciation in the last 10,000 years or so.

View down west fork of Chistochina Glacier. Denali fault can be seen crossing the glacier, Wrangell volcanoes in the distance.

Denali fault near headwaters of Chistochina River, view to the south. Dark blur at top of photo is rotor blade.

View south along Tok Cutoff Highway. Here the fault offset the road almost 7 meters.

View southeast along the Totschunda fault.

Near the southeast extent of the surface rupture of the Totschunda fault thrust faulting pushed the frozen sand and gravel over the snow surface.

Fault trace in trees west of the Mentasta Road. Tallest trees are perhaps 40 feet tall.

At pass west of Delta River. Here there was roughly 5 m of offset. Note the push up in the background. There is permafrost at the bottom of the cracks.

View eastward along Black Rapids Glacier. The Denali fault follows the trace of the glacier. These very large rockslides went a mile across the glacier on the right side. Investigations of the headwall of the middle landslide indicate a volume at least as large as that which fell, has dropped a meter or two and is almost ready to fall.

View north along Richardson Highway where it was offset by the Denali fault. Trans Alaska Pipeline is in the background.

Trace of Denali fault along north margin of Canwell Glacier.

USGS and university geologists study the walls of a trench across a recently discovered strand of the Seattle fault.

Hector Mine surface rupture after 1999 earthquake in southern California. 

The Landers fault (red lines at left) and the Hector Mine fault and its aftershocks (red lines and circles at right). The Hector Mine earthquake was a magnitude 7.1, and it produced thousands of aftershocks. 

Fault surface trace of the Hector Mine fault after the October 16, 1999 M7.1 rupture. (Photo by Katherine Kendrick, U.S. Geological Survey)

Looking towards NW across Lavic Lake, rupture passing from lower right, stepping out toward upper left; NW end of the surface rupture is in the distance on the far side of Lavic Lake.

Splaying of fractures viewed from above.

Fractures crossing a wash.

View right along the main rupture zone, and also visible is a subsidiary fracture from lower-right corner coalescing with the main break in the middle distance.

Fracture running along hillside in low-relief topography with offset gullies and tracks.

Ground view along surface rupture, showing the fracturing of the soil and how pieces have been pushed up within the fault zone.