Publications
Filter Total Items: 7614
Investigating climate change by digital analysis of blue-ice extent on satellite images of Antarctica Investigating climate change by digital analysis of blue-ice extent on satellite images of Antarctica
Landsat-5 Thematic Mapper (TM) and SPOT data collected two years apart from an identical area of Dronning (Queen) Maud Land, Antarctica, have been analyzed to detect variations in surface features that may signal climatic change, and to establish a technique that readily identifies such changes. We found that selective principal component analysis (Chavez and Kwarteng 1989), on band...
Authors
Olav Orheim, Baerbel K. Lucchitta
Hurricane impacts on the coastal environment Hurricane impacts on the coastal environment
In terms of insured losses, Hurricane Andrew is the most severe catastrophe in the Nation's history. Prior to the arrival of Andrew, the U.S. Geological Survey (USGS), in cooperation with the Louisiana Geological Survey (LGS), acquired an extensive body of information and data on the behavior and long-term erosion of Louisiana barrier islands. As a result, we have a clear understanding...
Authors
Abby Sallenger
Influence of local geology in the San Francisco Bay region, California on ground motions generated by the Loma Prieta earthquake of October 17, 1989, Tokyo, Japan Influence of local geology in the San Francisco Bay region, California on ground motions generated by the Loma Prieta earthquake of October 17, 1989, Tokyo, Japan
No abstract available.
Authors
Roger D. Borcherdt
A numerical study of some potential sources of error in side-by-side seismometer evaluations A numerical study of some potential sources of error in side-by-side seismometer evaluations
This report presents the results of a series of computer simulations of potential errors in test data, which might be obtained when conducting side-by-side comparisons of seismometers. These results can be used as guides in estimating potential sources and magnitudes of errors one might expect when analyzing real test data. First, the derivation of a direct method for calculating the...
Authors
L. Gary Holcomb
Summary of geotechnical and hydrologic data collected through April 30, 1990, for the Alani-Paty Landslide, Manoa Valley, Honolulu, Hawaii Summary of geotechnical and hydrologic data collected through April 30, 1990, for the Alani-Paty Landslide, Manoa Valley, Honolulu, Hawaii
No abstract available.
Authors
R.L. Baum, S.R. Spengler, J.D. Torikai, L.A. Liu
Cincinnati landslide database Cincinnati landslide database
No abstract available.
Authors
R.L. Berknopf, R. H. Campbell, D.S. Brookshire, C.D. Shapiro
Small domes on Venus: Probable analogs of Icelandic lava shields Small domes on Venus: Probable analogs of Icelandic lava shields
On the basis of observed shapes and volumetric estimates, we interpret small, dome-like features on radar images of Venus to be analogs of Icelandic lava-shield volcanoes. Using morphometric data for venusian domes in Aubele and Slyuta (in press), as well as our own measurements of representative dome volumes and areas from Tethus Regio, we demonstrate that the characteristic aspect...
Authors
James B. Garvin, Richard S. Williams
Origin of Florida Canyon and the role of spring sapping on the formation of submarine box canyons Origin of Florida Canyon and the role of spring sapping on the formation of submarine box canyons
Florida Canyon, one of a series of major submarine canyons on the southwestern edge of the Florida Platform, was surveyed using GLORIA, SeaBeam, and Deep-Tow technologies, and it was directly observed during three DSRV Alvin dives. Florida Canyon exhibits two distinct morphologies: a broad V-shaped upper canyon and a deeply entrenched, flat-floored, U-shaped lower canyon. The flat-...
Authors
Charles K. Paull, Fred N. Spiess, Joseph R. Curray, David C. Twichell
Early Cretaceous shelf-edge deltas of the Baltimore Canyon Trough: principal sources for sediment gravity deposits of the northern Hatteras Basin Early Cretaceous shelf-edge deltas of the Baltimore Canyon Trough: principal sources for sediment gravity deposits of the northern Hatteras Basin
We present evidence that the principal sources for Early Cretaceous (Berriasian-Valanginian) gravity-flow deposits of the northern Hatteras Basin were three large shelf-edge deltas located along the outer margin of the Baltimore Canyon Trough, ∼ 100 km southeast of Cape Charles, Virginia, Ocean City, Maryland, and Long Branch, New Jersey. Sedimentary detritus from the central Appalachian...
Authors
C. Wylie Poag, B. Ann Swift, John S. Schlee, Mahlon M. Ball, Linda L. Sheetz
Chronostratigraphic relations of neogene formations of the Great Hungarian Plain based on interpretation of seismic and paleomagnetic data Chronostratigraphic relations of neogene formations of the Great Hungarian Plain based on interpretation of seismic and paleomagnetic data
No abstract available.
Authors
G. Pogacsas, L. Lakatos, E. Simon, G. Vakaros, G. L. Varkonyi, P. Varnai, Aron Jambor, T. Hamar, M. Lantos, Robert E. Mattick, Donald P. Elston
Flume experiments on the alignment of transverse, oblique, and longitudinal dunes in directionally varying flows Flume experiments on the alignment of transverse, oblique, and longitudinal dunes in directionally varying flows
For more than a century geologists have wondered why some bedforms are orientated roughly transverse to flow, whereas others are parallel or oblique to flow. This problem of bedform alignment was studied experimentally using subaqueous dunes on a 3–6-m-diameter sand-covered turntable on the floor of a 4-m-wide flume. In each experiment, two flow directions (relative to the bed) were...
Authors
David M. Rubin, Hiroshi Ikeda
Impact assessment of exploratory wells offshore South Florida Impact assessment of exploratory wells offshore South Florida
No abstract available
Authors
Eugene A. Shinn, Barbara H. Lidz, Phillip A. Dustan