Radar structure of earthquake-induced, coastal landslides in Anchorage, Alaska
Ground-penetrating radar (GPR) was used to investigate the internal structure of two large landslides in Anchorage, Alaska that resulted from the great 1964 earthquake. The Government Hill and Turnagain Heights landslides occurred in similar stratigraphic and geographic settings, yet the style of ground deformation is different at each site. GPR data are compared with previous investigations and are shown, under certain conditions, to have utility in the identification of ancient landslides. Reflection surveys accurately reproduced the subsurface geometry of horst and graben structures and imaged finer scale features such as ground cracks and fissures. Where more complete disintegration of the bluff occurred, GPR reflections from within the slide mass are generally chaotic and include no recognizable evidence of the original stratigraphy. Common midpoint surveys estimated GPR velocity in the sediment and allowed the conversion of travel times to depths.
Citation Information
Publication Year | 2000 |
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Title | Radar structure of earthquake-induced, coastal landslides in Anchorage, Alaska |
DOI | 10.1046/j.1526-0984.2000.71007.x |
Authors | Walter Barnhardt, Robert E. Kayen |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Environmental Geosciences |
Index ID | 70243622 |
Record Source | USGS Publications Warehouse |
USGS Organization | Pacific Coastal and Marine Science Center |