Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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The New Ireland Basin; a frontier basin in Papua New Guinea
No abstract available.
Authors
N.F. Exon, Michael S. Marlow
Development of an aquifer management model AQMAN3D
A computer code that enables the use of the USGS Modular groundwater flow model for aquifermanagement modeling has been developed. Aquifermanagement techniques integrate groundwater flow modeling with linear quadratic optimization methods for the solution of various aquifer management problems. The model AQMAN3D, is a modified version of a previously developed two-dimensional AQMAN model. The idea
Authors
Juan Carlos Puig, L. I. Rolon-Collazo, Ishmael Pagan-Trinidad
Field trip guide - American Water Resources Association
No abstract available.
Authors
Matthew C. Larsen, Thalia D. Veve
Landslide processes in saprolitic soils of a tropical rain forest, Puerto Rico
Shallow soil slips, earth and debris slides appear to be a primary mechanism of hillslope denudation in the rainforest of eastern Puerto Rico. Annual rainfall in excess of 4,000 mm, and thick sequences (up to 20 m) of residual soils (saprolite) combine to produce these landslides. Shear strength testing and observatons of tension cracks indicate that landslides may start as tensile failure of sapr
Authors
Matthew C. Larsen, Andrew Simon
Rainfall-soil moisture relations in landslide-prone areas of a tropical rain forest, Puerto Rico
Soil moisture conditions are not well documented in steep, tropical landslide-prone terrain. In the 11,330 ha Caribbean National Forest (CNF) in northeastern Puerto Rico more than 170 landslides that occurred from one to approximately 60 years ago have been mapped. Most of these landslides are shallow, with failure depths of 0.5 ot 7 m, and are associated with periods of intense, prolonged rainfal
Authors
Matthew C. Larsen, Angel J. Torres-Sanchez
Hydrochemistry of the South Coastal Plain Aquifer System of Puerto Rico and its relation to surface-water recharge
No abstract available.
Authors
Fernando Gomez-Gomez
On the rupture zone and effects of local geologic conditions on damages and ground motions for the Armenian earthquakes of December 7, 1988
No abstract available.
Authors
Roger D. Borcherdt, C. Langer, John R. Filson, D.W. Simpson, G. Glassmoyer, M. Andrews, E. Cranswick
A computer program for GEOphysical log data MANagement and plotting (GEOMAN)
No abstract available.
Authors
I. E. Arroyo, Sigfredo Torres-Gonzalez, Ramon A. Carrasquillo
Introduction to stratigraphy and hydrocarbon occurrence in Oligocene and Miocene rocks of the Santa Barbara-Ventura and Santa Maria Basins of California
The Santa Barbara-Ventura and Santa Maria basins of southern California have been of great interest to the oil industry because oil or gas has been produced from nearly all the sedimentary units ranging in age from the Cretaceous to the Pleistocene. In particular, the Neogene section of these basins is oil-rich, containing eight giant oil fields (greater than 100 million barrels) in the onshore an
Authors
Margaret A. Keller
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 spectral reflectance study (0.4-2.5 μm) of selected playa evaporite mineral deposits and related geochemical processes
Playa evaporite mineral deposits show major compositional variations related to differences in lithology, hydrology, and groundwater geochemistry. The use of visible and near-infrared (VNIR) spectral reflectance measurements as a technique for investigating the mineralogy of playa efflorescent crusts is examined. Samples of efflorescent crust were collected from 4 playa: Bristol Dry Lake, Saline V
Authors
James K. Crowley
A survey of three-dimensional numerical estuarine models
No abstract available.
Authors
R. T. Cheng, P. E. Smith