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Ground Failure


Imaging The M7.9 Denali Fault Earthquake 2002 Rupture At The Delta River Using SASW, LIDAR, and RADAR


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Summary

The bedrock offset of the Denali Fault at the Delta River crossing is varies between 55 and 95 meters, up to the north, based on SASW-shear wave velocity models. The 2002 earthquake contributed between 0.6 and 0.8 meters to the total offset (~1%). LIDAR imagery in 2004 shows excellent preservation of the scarp on the Delta River deposits. LIDAR provides a permanent quantitative 3-D record of surface deformation along a fault at position accuracies of <1cm. GPR was used to identify dragged and offset beds across the scarp, primarily from the last event.


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last modified 13 April 2005

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