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Ground-water levels in the alluvial aquifer in eastern Arkansas, 1985
Maria Plafcan
1986, Open-File Report 86-242
This report, prepared by the U.S. Geological Survey in cooperation with the Arkansas Soil and Water Conservation Commission, the U.S. Soil Conservation Service and local Conservation Districts, contains groundwater level measurements in 485 wells tapping the Mississippi River Valley alluvial aquifer of eastern Arkansas. The measurements were made by district...
Log of an exploratory trench in the New Madrid seismic zone near Blytheville, Arkansas
Kathleen M. Haller, Anthony J. Crone
1986, Miscellaneous Field Studies Map 1858
During the winter of 1811-12, at least three major earthquakes having estimated magnitudes of MS 8.3-8.8 (Nuttli and Herrmann, 1984) struck the area near New Madrid, Mo. Since the 1811-12 series of earthquakes, 20 damaging earthquakes have occurred in the area (Nuttli, 1982), making the New Madrid seismic zone (fig....
Methods for hydrologic monitoring of surface mining in the central-western United States
J.T. Turk, R. S. Parker, R.S. Williams Jr.
1986, Open-File Report 84-600
The regulations promulgated pursuant to the Surface Mining Control and Reclamation Act require the monitoring of potentially impacted hydrologic systems before, during, and after mining operations. This report details characteristics and processes that commonly determine the most acceptable approaches to hydrologic monitoring in the arid and semiarid central-western United States....
Operating manual for the digital data-collection system for flow-control structures
J.I. Rorabaugh, W.L. Rapp
1986, Open-File Report 85-691
This manual was written to help the user operate and maintain the digital data collection system for flow control structures. The system is used to measure daily discharge through river control dams. These dams commonly have tainter gates which are raised and lowered to keep the upper pool level relatively...
Trace-element contents of postorogenic granites of the eastern Arabian Shield, Kingdom of Saudi Arabia
J. S. Stuckless, R. B. Vaughn, George VanTrump Jr.
1986, Open-File Report 86-261
Trace-element contents for 46 postorogenic granitoids vary by as much as two orders of magnitude; most samples are strongly enriched in incompatible elements (such as the heavy rare earths, yttrium, niobium, and uranium) and depleted in the compatible elements (such as barium, strontium, scandium, europium, and cobalt). These trace-element characteristics...