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Tests of the standard (30 hz) NCER FM multiplex telemetry system, augmented by two timing channels and a compensation reference signal, used to record multiplexed seismic network data on magnetic tape
Jerry P. Eaton
1976, Open-File Report 76-374
The application of subtractive compensation to USGS seismic magnetic tape recording and playback systems was examined in a recent USGS Open-file report (1). It was found, for the standard (30 Hz) NCER multiplex system, that subtractive compensation utilizing a 4688 Hz reference signal multiplexed onto each data track was more...
Distribution functions for statistics derived from bivariate normal and bivariate two-parameter log-normal populations
James Richard Slack, Nicholas C. Matalas, James R. Wallis
1976, Open-File Report 76-214
The distribution functions for hydrologic statistics that may be used to assess the significance of differences between sample means, standard deviations, coefficients of skewness, and coefficients of variations are obtained by Monte Carlo experiments. The distributions are expressed as functions of sample size, cross correlation, and skewness. In general, the...
Flood characteristics of streams in Owyhee County, Idaho
H. C. Riggs, W. A. Harenberg
1976, Water-Resources Investigations Report 76-88
Channel-width measurements were used to estimate annual peaks with a recurrence interval of 10 years at 79 sites in Owyhee County, Idaho, and adjacent areas. These discharges and those from 33 gaging stations are plotted on a map of the area. The map will allow the user to interpolate between...
Availability of ground water in the Middle Connecticut River basin, west-central New Hampshire
John E. Cotton
1976, Water-Resources Investigations Report 76-18
This report provides a guide for ground-water exploration and for water- and land-use planning and management.  Sufficient amounts of water to supply single family homes are available from the bedrock aquifer nearly everywhere in the middle Connecticut River basin.  Relatively thin and narrow, unconsolidated aquifers of sand or sand and...
Documentation of programs that compute 1) static tilts for a spatially variable slip distribution, and 2) quasi-static tilts produced by an expanding dislocation loop with a spatially variable slip distribution
Stuart McHugh
1976, Open-File Report 76-578
The material in this report is concerned with the effects of a vertically oriented rectangular dislocation loop on the tilts observed at the free surface of an elastic half-space. Part I examines the effect of a spatially variable static strike-slip distribution across the slip surface. The tilt components as a...
Tilt changes of short duration
Stuart McHugh
1976, Open-File Report 76-750
Section I of this report contains a classification scheme for short period tilt data. For convenience, all fluctuations in the local tilt field of less than 24 hours duration will be designated SP (i.e., short period) tilt events. Three basic categories of waveshape appearance are defined, and the rules for...
Status of the National Water Data Exchange (NAWDEX); September 1976
Melvin D. Edwards
1976, Open-File Report 76-719
The National Water Data Exchange (NAWDEX) has been established to assist users of water data in the identification, location, and acquisition of needed data. NAWDEX is not a depository of water data; its objectives are to provide the user with sufficient information to define what data are available, where these...
Measured and simulated ground-water levels in the Franklin area, southeastern Virginia
O. J. Cosner
1976, Water-Resources Investigations Report 76-83
The Lower Cretaceous aquifer is the principal source of water in Southeastern Virginia. Synoptic water-level measurements made since 1970 have been used to verify a digital model of the aquifer. Measurements made in December 1973, August and December 1974 were used to further verify the model, using updated pumpage for...