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Page 5438, results 135926 - 135950

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Digital seismograms of aftershocks of the Imperial Valley, California, earthquake of October 15, 1979
Joe B. Fletcher, Ricardo L. Zepeda, David M. Boore
1981, Open-File Report 81-655
This report presents the digital seismograms collected for the aftershocksof the Imperial Valley, California earthquake (ML = 6.6) that occurred onL October 15, 1979. A short summary follows that describes the field procedures, instrumentation, and routine computer analysis that was used to produce the ground motion time histories. Boore and...
Manual for leveling at gaging stations in North Carolina
N.O. Thomas, N.M. Jackson
1981, Open-File Report 81-1104
This manual was prepared to serve several purposes in the U.S. Geological Survey North Carolina District. This manual sets forth District policy as to frequency of levels, accuracy criteria, procedures for checking the datum and setting of the various types of gages, general rules to follow in establishing the original...
Quality of surface water in the coal-mining areas of western Maryland and adjacent areas of Pennsylvania and West Virginia from April 1979 to June 1980
W. W. Staubitz
1981, Open-File Report 81-812
The U.S. Geological Survey is studying the water quality of streams within the Eastern Coal Province. This report contains streamflow, water-quality, and biologic data collected in the North Branch Potomac River basin and in the Maryland portion of the Youghiogheny and Casselman River basins. Data collected from 64 streams from...
Computer simulation of the steady-state flow system of the Tertiary limestone (Floridan) aquifer system in east-central Florida
C. H. Tibbals
1981, Open-File Report 81-681
The predevelopment steady-state ground-water flow system for 13 ,700 square miles of the Tertiary limestone aquifer system (known as the Florida aquifer in Florida) in east-central Florida is simulated by means of a digital computer model. The model results indicate that about 1,900 cubic feet per second recharges the aquifer...
Bathymetric map of the continental slope and uppermost continental rise between Lindenkohl Canyon and South Toms Canyon, offshore Eastern United States
James M. Robb, John R. Kirby, John C. Hampson
1981, Miscellaneous Field Studies Map 1270
This map was prepared as part of a study of geologic hazards to resource exploration and development on the Continental Slope in the Baltimore Canyon Trough area, off southern New Jersey.  Detailed bathymetric maps are required for enfineering studies of bottom stability and for geologic  interpretation of the nature of...
Dissolution of sphalerite in ferric chloride solution
Huai Su
1981, Open-File Report 81-609
The dissolution of sphalerite in acidic ferric chloride solution of polished flat surfaces and of spherical particle surface was investigated. Tests were conducted on sphalerite to study rate of dissolution by the effects of stirring speed, temperature, ferric and ferrous concentrations, purity, and particle size.Kinetic investigations were conducted in a...