Wes Wallace took these photos on November 8 and 9 while working with Brian Sherrod and Tim Dawson of the U.S. Geological Survey, who were making observations and measurements of offsets along the length of the surface rupture . The photos are in order along the trace of the Denali and Totschunda faults from the Gakona glacier in the west to the northern Totschunda fault system in the Little Tok River Valley to the east.
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Aerial view of fault trace in snow in the fault trench between Gakona and Chistochina glaciers. Topography and stream drainages reflect previous offsets.
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Aerial view of en echelon fissures in snow along the fault trace in the fault trench between Chistochina glacier and Gillett Pass. Breaks in snow in the lower right probably formed over small topographic highs in response to ground shaking.
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Aerial view of en echelon fissures in snow along the fault trace in the fault trench between Chistochina glacier and Gillett Pass. Breaks in snow off the fault trace probably are a response to ground shaking over small topographic highs and along the upper edge of the stream bank.
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Aerial view of two nearly orthogonal sets of breaks in snow cover along the fault trace in the upper Middle Fork Chistochina River valley. The better-developed set of left-stepping en echelon faults locally displays en echelon fissures of the same sense, suggesting that these are synthetic Riedel shears formed by the right-lateral motion of the Denali fault. The less prominent orthogonal features may be contractional structures.
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Aerial view of left-stepping en echelon breaks in the Chistochina glacier along the fault trace.
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Right-lateral offset in upper Jack Creek, near the point of maximum displacement during the November 3 earthquake. The edge of the stream bank on the far (northern) side of the fault was offset 8 m to the right with respect to the edge of the stream bank in the foreground (between left geologist and small tree). The north side also was offset about 1.5 m upward with respect to the south side.
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Last updated on November, 2002
