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A probabilistic estimate of maximum acceleration in rock in the contiguous United States
Sylvester Theodore Algermissen, David M. Perkins
1976, Open-File Report 76-416
This paper presents a probabilistic estimate of the maximum ground acceleration to be expected from earthquakes occurring in the contiguous United States. It is based primarily upon the historic seismic record which ranges from very incomplete before 1930 to moderately complete after 1960. Geologic data, primarily distribution of faults, have...
Oxalic-acid leaching of rock, soil, and stream-sediment samples as an anomaly-accentuated technique
Henry V. Alminas, Elwin L. Mosier
1976, Open-File Report 76-275
In many instances total-rock and sieved-soil and stream-sediment samples lack the sensitivity and contrast required for reconnaissance exploration and necessary in the search for blind ore deposits. Heavy-mineral concentrates incorporate the required sensitivity and contrast but are overly expensive for two reasons: time-consuming sample preparation is required to obtain them,...