The importance of earthquake-induced landslides to long-term slope erosion and slope-failure hazards in seismically active regions
D. K. Keefer
1994, Geomorphology (10) 265-284
This paper describes a general method for determining the amount of earthquake-induced landsliding that occurs in a seismically active region over time; this determination can be used as a quantitative measure of the long-term hazard from seismically triggered landslides as well as a measure of the importance of this process...
A pore-pressure diffusion model for estimating landslide-inducing rainfall
M.E. Reid
1994, Journal of Geology (102) 709-717
Many types of landslide movement are induced by large rainstorms, and empirical rainfall intensity/duration thresholds for initiating movement have been determined for various parts of the world. In this paper, I present a simple pressure diffusion model that provides a physically based...
Helping the public find information the U.S. Government Information Locator Service (GILS)
E.J. Christian
1994, Journal of Government Information (21) 305-314
As part of the National Information Infrastructure, the U.S. federal government is establishing a Government Information Locator Service (GILS). GILS will identify and describe public information resources throughout the federal government and provide assistance in obtaining the information. It will be decentralized and will supplement other agency and commercial information...
Hydrochemistry of the Mahomet Bedrock Valley Aquifer, East-Central Illinois: Indicators of recharge and ground-water flow
S.V. Panno, Keith C. Hackley, K. Cartwright, Chao-Li Liu
1994, Groundwater (32) 591-604
A conceptual model of the ground-water flow and recharge to the Mahomet Bedrock Valley Aquifer (MVA), east-central Illinois, was developed using major ion chemistry and isotope geochemistry. The MVA is a “basal” fill in the east-west trending buried bedrock valley composed of clean, permeable...
Contributions to a shallow aquifer study by reprocessed seismic sections from petroleum exploration surveys, eastern Abu Dhabi, United Arab Emirates
D. Woodward
1994, Journal of Applied Geophysics (31) 271-289
The US Geological Survey, in cooperation with the National Drilling Company of Abu Dhabi, is conducting a 4-year study of the fresh and slightly saline groundwater resources of the eastern Abu Dhabi Emirate. Most of this water occurs in a shallow aquifer, generally less than 150 m deep, in the...
Geochemical soil sampling for deeply-buried mineralized breccia pipes, northwestern Arizona
K. J. Wenrich, R. M. Aumente-Modreski
1994, Applied Geochemistry (9) 431-454
Thousands of solution-collapse breccia pipes crop out in the canyons and on the plateaus of northwestern Arizona; some host high-grade uranium deposits. The mineralized pipes are enriched in Ag, As, Ba, Co, Cu, Mo, Ni, Pb, Sb, Se, V and Zn. These breccia pipes formed as sedimentary strata collapsed into...
Calculation of 230ThU isochrons, ages, and errors
K.R. Ludwig, D.M. Titterington
1994, Geochimica et Cosmochimica Acta (58) 5031-5042
If analytical errors are responsible for the scatter of points on a 230Th-234U-238U isochron diagram, the isochron should be fitted by a technique that1. weights the points according to their analytical errors and error correlations, and2. either takes into account the presence of some of the same data...
Sensitivity of northern Sierra Nevada streamflow to climate change
L.F.W. Duell
1994, Water Resources Bulletin (30) 841-859
The sensitivity of streamflow to climate change was investigated in the American, Carson, and Truckee River Basins, California and Nevada. Nine gaging stations were used to represent streamflow in the basins. Annual models were developed by regressing 1961-1991 streamflow data on temperature and precipitation. Climate-change scenarios were used as inputs...
Specific yield as determined by type-curve analysis of aquifer-test data
Allen F. Moench
1994, Ground Water (32) 949-957
The commonly used analytical solution developed by Neuman for a homogeneous, water-table aquifer assumes that the drainage of pores in the zone above the water table due to lowering of the water table occurs instantaneously. Noninstantaneous drainage of pores in the unsaturated zone accounts for the finding that both type-curve...
Emission rates of sulfur dioxide and carbon dioxide from Redoubt Volcano, Alaska during the 1989-1990 eruptions
T. J. Casadevall, M.P. Doukas, C.A. Neal, R. G. McGimsey, C. A. Gardner
1994, Journal of Volcanology and Geothermal Research (62) 519-530
Airborne measurements of sulfur dioxide emission rates in the gas plume emitted from fumaroles in the summit crater of Redoubt Volcano were started on March 20, 1990 using the COSPEC method. During the latter half of the period of intermittent dome growth and destruction, between March 20 and mid-June 1990,...
Profile development for the Spatial Data Transfer Standard
John A. Szemraj, Robin G. Fegeas, Billy R. Tolar
1994, Cartography and Geographic Information Systems (21) 150-154
The Spatial Data Transfer Standard (SDTS), or Federal Information Processing Standard (FIPS) 173, is designed to support all types of spatial data. Implementing all of the standard's options at one time is impractical. Therefore, implementation of the SDTS is being accomplished through the use of profiles. Profiles are clearly defined,...
PETRO.CALC.PLOT, Microsoft Excel macros to aid petrologic interpretation
G.B. Sidder
1994, Computers & Geosciences (20) 1041-1061
PETRO.CALC.PLOT is a package of macros which normalizes whole-rock oxide data to 100%, calculates the cation percentages and molecular proportions used for normative mineral calculations, computes the apices for ternary diagrams, determines sums and ratios of specific elements of petrologic interest, and plots 33 X-Y graphs and five ternary diagrams....
Salinity increases in the navajo aquifer in southeastern Utah
D. L. Naftz, L.E. Spangler
1994, Water Resources Bulletin (30) 1119-1135
Salinity increases in water in some parts of the Navajo aquifer in southeastern Utah have been documented previously. The purpose of this paper is to use bromide, iodide, and chloride concentrations and del oxygen-18 and deuterium values in water from the study area to determine if oil-field brines (OFB) could...
A spatial features register: Toward standardization of spatial features
Janette Cascio
1994, Cartography and Geographic Information Systems (21) 155-158
As the need to share spatial data increases, more than agreement on a common format is needed to ensure that the data is meaningful to both the importer and the exporter. Effective data transfer also requires common definitions of spatial features. To achieve this, part 2 of the Spatial Data...
Uranium-Series Ages of Marine Terrace Corals from the Pacific Coast of North America and Implications for Last-Interglacial Sea Level History
D.R. Muhs, G. L. Kennedy, T. K. Rockwell
1994, Quaternary Research (42) 72-87
Few of the marine terraces along the Pacific coast of North America have been dated using uranium-series techniques. Ten terrace sequences from southern Oregon to southern Baja California Sur have yielded fossil corals in quantities suitable for U-series dating by alpha spectrometry. U-series-dated terraces representing the ???80,000 yr sea-level high...
Variations in the chemical and stable isotope composition of carbon and sulfur species during organic-rich sediment alteration: An experimental and theoretical study of hydrothermal activity at Guaymas Basin, Gulf of California
Jeffrey S. Seewald, W.E. Seyfried Jr., Wayne C. Shanks III
1994, Geochimica et Cosmochimica Acta (58) 5065-5082
Organic-rich diatomaceous ooze was reacted with seawater and a Na-Ca-K-Cl fluid of seawater chlorinity at 325–400°C, 400–500 bars, and fluid/sediment mass ratios of 1.56–2.35 to constrain factors regulating the abundance and stable isotope composition of C and S species during hydrothermal alteration of sediment from Guaymas Basin, Gulf of California....
Seismological aspects of the 1989-1990 eruptions at redoubt volcano, Alaska: the SSAM perspective
C.D. Stephens, B. A. Chouet, R.A. Page, J.C. Lahr, J.A. Power
1994, Journal of Volcanology and Geothermal Research (62) 153-182
SSAM is a simple and inexpensive tool for continuous monitoring of average seismic amplitudes within selected frequency bands in near real-time on a PC-based data acquisition system. During the 1989-1990 eruption sequence at Redoubt Volcano, the potential of SSAM to aid in rapid identification of precursory Long-Period (LP) event swarms...
Expert systems for automated correlation and interpretation of wireline logs
Ricardo A. Olea
1994, Mathematical Geology (26) 879-897
CORRELATOR is an interactive computer program for lithostratigraphic correlation of wireline logs able to store correlations in a data base with a consistency, accuracy, speed, and resolution that are difficult to obtain manually. The automatic determination of correlations is based on the maximization of a weighted correlation coefficient using two...
Accuracy, reproducibility, and interpretation of fatty acid methyl ester profiles of model bacterial communities
Haack S. Kidd, H. Garchow, D.A. Odelson, L.J. Forney, M.J. Klug
1994, Applied and Environmental Microbiology (60) 2483-2493
We determined the accuracy and reproducibility of whole-community fatty acid methyl ester (FAME) analysis with two model bacterial communities differing in composition by using the Microbial ID, Inc. (MIDI), system. The biomass, taxonomic structure, and expected MIDI-FAME profiles under a variety of environmental conditions were known for these model communities...
Floodflow effects on riparian vegetation in Arizona
J. V. Phillips, H. W. Hjalmarson
1994, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
A relation for estimating changes in the condition of riparian vegetation as a function of stream power was developed for stream channels in central Arizona. Flood and vegetation data were collected from 13 flows at 11 sites. Stream power was computed at cross sections and plotted against the average height...
Flood monitoring network in southeastern Louisiana
Brian E. McCallum
1994, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
A flood monitoring network has been established to alert emergency operations personnel and the public about hydrologic conditions in the Amite River Basin. The U.S. Geological Survey (USGS), in cooperation with the Louisiana Office of Emergency Preparedness (LOEP), has installed a real-time data acquisition system to monitor rainfall and river...
Paleoclimatic Inferences from a 120,000-Yr Calcite Record of Water-Table Fluctuation in Browns Room of Devils Hole, Nevada
Barney J. Szabo, Peter T. Kolesar, A.C. Riggs, I.J. Winograd, K.R. Ludwig
1994, Quaternary Research (41) 59-69
The petrographic and morphologic differences between calcite precipitated below, at, or above the present water table and uranium-series dating were used to reconstruct a chronology of water-table fluctuation for the past 120,000 yr in Browns Room, a subterranean air-filled chamber of Devils Hole fissure adjacent to the discharge area of...
Prediction of structural response to large earthquakes by using recordings from smaller earthquakes
Erdal Safak
1994, Conference Paper, Structures Congress XII
The feasibility of predicting structural response to large earthquakes by using recorded responses from collocated smaller earthquakes is investigated. Records from large earthquakes can be approximated as linear combinations of records from smaller earthquakes. Two methods are introduced to predict structural response to a large earthquake by using the recorded...
Mantle plume influence on the Neogene uplift and extension of the US western Cordillera?
T. Parsons, G. A. Thompson, Norman H. Sleep
1994, Geology (22) 83-86
espite its highly extended and thinned crust, much of the western Cordillera in the United States is elevated more than 1 km above sea level. Therefore, this region cannot be thought of as thick crust floating isostatically in a uniform mantle; rather, the...
Geodetic slip rate for the eastern California shear zone and the recurrence time of Mojave desert earthquakes
J. Sauber, W. Thatcher, S.C. Solomon, M. Lisowski
1994, Nature (367) 264-266
Where the San Andreas fault passes along the southwestern margin of the Mojave desert, it exhibits a large change in trend, and the deformation associated with the Pacific/North American plate boundary is distributed broadly over a complex shear zone. The importance of understanding the partitioning of strain across this region,...
