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Publication Extents

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Mathematical model of gamma-ray spectrometry borehole logging for quantitative analysis
Ulrich Schimschal
1981, Open-File Report 81-402
A technique for analyzing gamma-ray spectral-logging data has been developed, in which a digital computer is used to calculate the effects of gamma-ray attentuation in a borehole environment. The computer model allows for the calculation of the effects of lithology, porosity, density, and the thickness of a horizontal layer of...
Changes in the discharge characteristics of thermal springs and fumaroles in the Long Valley Caldera, California, resulting from earthquakes on May 25-27, 1980
M.L. Sorey, Mark D. Clark
1981, Open-File Report 81-203
Changes in flow rate and turbidity have been observed and measured in hot springs in the Long Valley caldera, California, following earthquakes with magnitudes up to 6.3 in May 1980. Increases in flow rate of some hot springs occurred within minutes of the earthquakes, followed by more gradual decreases in...
Surficial geophysical data for two cross-valley lines in the middle Eagle River valley, Alaska
Larry L. Dearborn, Donald H. Schaefer
1981, Open-File Report 80-2000
In 1979, six electrical resistivity and four seismic refraction soundings were made in the middle reach of the Eagle River valley northeast of Anchorage, Alaska. Interpretation of the geophysical data collected indicated that depth to bedrock below the valley floor varies between about 350 and 450 feet. Two, and perhaps...
Earthquake prediction research in Taiwan
Charles G. Sammis, T.C. Lee
1981, Open-File Report 81-261
This report summarizes work under U.S.G.S. Contract #14-08-0001-16895. The purpose of this contract was to provide equipment to Taiwan to assist that country in establishing a program in earthquake prediction and hazards studies. Also, expert assistance was provided for Taiwan's establishment of a routine field program using the equipment....
Hydrologic data for the Cache Creek-Bear Thrust environmental impact statement near Jackson, Wyoming
G.S. Craig Jr., B. H. Ringen, E.R. Cox
1981, Open-File Report 81-410
Information on the quantity and quality of surface and ground water in an area of concern for the Cache Creek-Bear Thrust Environmental Impact Statement in northwestern Wyoming is presented without interpretation. The environmental impact statement is being prepared jointly by the U.S. Geological Survey and the U.S. Forest Service and...
Floods in Maine, April-May 1979
Richard A. Fontaine, C. Richard Haskell
1981, Water-Resources Investigations Report 81-68
Heavy rainfall during April 27-30, 1979, resulted in moderate to record flooding in much of northern and western Maine. During this period, rainfall totals of as much as 6 inches were measured. This period was preceded by up to 10 days of seasonally warm temperatures and snowmelt, which helped create...