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The AAPG/Datapages Combined Publications Database
Environmental Geosciences (DEG)
Abstract
1
Walter Barnhardt is a research geologist with the Coastal and Marine
Geology Program of the U.S. Geological Survey in Menlo Park,
California. He received a BS in geology from the College of William and
Mary and an MS and PhD in geological sciences from the University of
Maine. Dr. Barnhardt's research focuses on the geomorphology,
sedimentology, and late Quaternary stratigraphy of coastal environments.
Robert Kayen is a research civil engineer at the United States
Geological Survey (USGS) in Menlo Park, California. He serves as
project chief at the USGS Coastal and Marine Geology Team for
multidisciplinary earthquake hazard studies in the Pacific Northwest.
He is on the editorial board of the American Society of Civil Engineers
Journal of Geotechnical and Geoenvironmental Engineering .
Kayen received a PhD in civil engineering from the University of
California at Berkeley and an MS in geology. Currently, he is
collaborating with Pacific Gas and Electric Company to quantify
potential earthquake ground-deformations in San Francisco Bay area
soils and assess the risk to buried utilities.
ABSTRACT
Ground-penetrating radar (GPR) was used to investigate the internalstructure of two large landslides in Anchorage, Alaska thatresulted from the great 1964 earthquake. The Government Hilland Turnagain Heights landslides occurred in similar stratigraphicand geographic settings, yet the style of ground deformationis different at each site. GPR data are compared with previousinvestigations and are shown, under certain conditions, to haveutility in the identification of ancient landslides. Reflectionsurveys accurately reproduced the subsurface geometry of horstand graben structures and imaged finer scale features such asground cracks and fissures. Where more complete disintegrationof the bluff occurred, GPR reflections from within the slidemass are generally chaotic and include no recognizable evidenceof the original stratigraphy. Common midpoint surveys estimatedGPR velocity in the sediment and allowed the conversion of traveltimes to depths.
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