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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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