Filters: Tags: bulk density (X)
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Data in the IGS' GeoLab database for w#84831: results for a bulk density analysis on a sample from 0.33 to 0.33 feet deep; and results for 6 grain size analyses on samples from 0.33 to 7.35 feet deep.
Data in the IGS' GeoLab database for w#84834: results for a bulk density analysis on a sample from 0.59 to 0.59 feet deep; and results for 5 grain size analyses on samples from 0.59 to 6.36 feet deep.
Data in the IGS' GeoLab database for w#89890: results for 3 bulk density analysis on samples from 4.6 to 11.3 feet deep; and results for 20 grain size analyses on samples from 0.25 to 12.25 feet deep.
These data were compiled to demonstrate new predictive mapping approaches and provide comprehensive gridded 30-meter resolution soil property maps for the Colorado River Basin above Hoover Dam. Random forest models related environmental raster layers representing soil forming factors with field samples to render predictive maps that interpolate between sample locations. Maps represented soil pH, texture fractions (sand, silt clay, fine sand, very fine sand), rock, electrical conductivity (ec), gypsum, CaCO3, sodium adsorption ratio (sar), available water capacity (awc), bulk density (dbovendry), erodibility (kwfact), and organic matter (om) at 7 depths (0, 5, 15, 30, 60, 100, and 200 cm) as well as depth to restrictive...
Physical properties of geologic units are important for geophysical interpretation because they provide the tie between lithology and geophysical fields. For gravity data, the applicable physical property is bulk density, which is the overall mass per unit volume of rocks, sediments, and their pore spaces. Bulk dry density is the mass per unit volume measured when the sample is dry. Saturated density is the mass per unit volume measured when the sample is saturated with fresh water, which has a density of 1,000 kg/m^3. The two values are commonly compared in order to determine the porosity of a sample, that is, the percentage of the volume that is composed of open space. Density is commonly reported in kilograms...
Categories: Data;
Types: Citation;
Tags: Arroyo Seco,
Cerro Negro,
Cerro de la Olla,
Cerro de los Taoses,
El Rito,
These data were compiled to demonstrate new predictive mapping approaches and provide comprehensive gridded 30-meter resolution soil property maps for the Colorado River Basin above Hoover Dam. Random forest models related environmental raster layers representing soil forming factors with field samples to render predictive maps that interpolate between sample locations. Maps represented soil pH, texture fractions (sand, silt clay, fine sand, very fine sand), rock, electrical conductivity (ec), gypsum, CaCO3, sodium adsorption ratio (sar), available water capacity (awc), bulk density (dbovendry), erodibility (kwfact), and organic matter (om) at 7 depths (0, 5, 15, 30, 60, 100, and 200 cm) as well as depth to restrictive...
These data were compiled to demonstrate new predictive mapping approaches and provide comprehensive gridded 30-meter resolution soil property maps for the Colorado River Basin above Hoover Dam. Random forest models related environmental raster layers representing soil forming factors with field samples to render predictive maps that interpolate between sample locations. Maps represented soil pH, texture fractions (sand, silt clay, fine sand, very fine sand), rock, electrical conductivity (ec), gypsum, CaCO3, sodium adsorption ratio (sar), available water capacity (awc), bulk density (dbovendry), erodibility (kwfact), and organic matter (om) at 7 depths (0, 5, 15, 30, 60, 100, and 200 cm) as well as depth to restrictive...
Data in the IGS' GeoLab database for w#84846: results for a bulk density analysis on a sample from 0.43 to 0.43 feet deep; and results for 4 grain size analyses on samples from 0.43 to 6.99 feet deep.
Data in the IGS' GeoLab database for w#66463: results for 7 bulk density analysis on samples from 18.0 to 78.8 feet deep; results for 7 clast lithology analyses on samples from 18.0 to 80.0 feet deep; results for 30 clay mineralogy analyses on samples from 2.4 to 81.0 feet deep; results for 36 grain size analyses on samples from 3.4 to 81.0 feet deep; and results for 30 matrix carbonate analyses on samples from 2.4 to 64.0 feet deep.
This file contains soil data for 3 depths (0-0.5 meters, 0.5-1.5 meters, and greater than 1.5 meters) for percent sand, clay, and rockiness for the entire globe at a half degree grid resolution. A single bulk density value and mineral depth are also provided for each gridcell. Bulk density values came from the the International Geosphere Biosphere Programme (IGBP). Mineral depth, clay, sand, and rockiness values came from the International Satellite Land Surface Climatology Project (ISLSCP).
Data in the IGS' GeoLab database for w#89886: results for 7 bulk density analysis on samples from 5.6 to 17.8 feet deep; results for 3 clay mineralogy analyses on samples from 7.5 to 17.1 feet deep; and results for 39 grain size analyses on samples from 0.25 to 21.3 feet deep.
Data in the IGS' GeoLab database for w#89889: results for 4 bulk density analysis on samples from 6.7 to 13.8 feet deep; and results for 20 grain size analyses on samples from 0.25 to 14.9 feet deep.
Regional surface elevation grid files (provided in Grid eXchange File format) were used to study crustal architecture beneath the Southern Midcontinent (USA) by McCafferty and others (2019). The study covered a rectangular, multi-state area of 924 by 924 kilometers centered on Missouri, and a corresponding volume extending from the topographic surface to a depth of 50 kilometers below sea level. The grid files (magnetic field observation surface, topographic surface, Precambrian basement surface, and Moho interface) were used to construct templates and initial physical property models for 3D inversions. A masked version of the Precambrian basement surface grid was used to remove inverted densities and magnetic susceptibilities...
Winter climate change has the potential to have a large impact on coastal wetlands in the southeastern U.S. Warmer winter temperatures and reductions in the intensity of freeze events would likely lead to mangrove forest range expansion and salt marsh displacement in parts of the U.S. Gulf of Mexico and Atlantic coast. The objective of this research was to better understand some of the ecological implications of mangrove forest migration and salt marsh displacement. The potential ecological effects of mangrove migration are diverse ranging from important biotic impacts (e.g., coastal fisheries, land bird migration; colonial nesting wading birds) to ecosystem stability (e.g., response to sea level rise and drought;...
The U.S. Geological Survey (USGS) collected rock physical property measurements to help understand causative sources of gravity and magnetic survey anomalies in the Iron Mountain-Menominee region, Michigan-Wisconsin. A total of 2,356 measurements of magnetic susceptibility and density from 152 locations have been conducted on Precambrian rocks. The measurements aid in interpretation of newly acquired ground-based gravity and airborne magnetic data that are helping to understand concealed Precambrian geology and potential mineral resources. Multiple measurements were made at each location and sample lithology units were derived from existing USGS geologic maps noted in the supplemental information section of the...
Categories: Data;
Tags: Density,
Dickinson,
Economic Geology,
GGGSC,
Geology, Geophysics, and Geochemistry Science Center,
Sediment cores were collected in Great Dismal Swamp National Wildlife Refuge in November, 2017 to advance understanding of climate- and land-management driven changes in vegetation, hydrology, and fire regimes. Radiocarbon dates were obtained from samples in two cores (GDS-519-3-21-2017 and GDS-520-3-21-2017) to generate age models for the cores. Bulk sediment samples, charcoal, plant macrofossils, and pollen residue were selected at the USGS in Reston, Virginia and submitted to Beta Analytic, Inc. and the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) laboratories for radiocarbon dating. Those laboratories provided both radiocarbon ages and stable carbon isotope (delta 13C) results, which can be...
Bed sediment samples were collected in San Pablo Bay and Grizzly Bays on eight days from June through November 2019, to analyze for sediment properties including bulk density, particle size distribution, and percent organic carbon. Sediment samples were collected from a small vessel near pre-established USGS instrument moorings using a Gomex box corer that was subsampled with three push cores (37 mm in diameter) per Gomex core. Six subsamples were collected from the top 5 centimeters (cm) of each push core, a few push cores included the top 8 cm. The top two subsamples were each 0.5 cm thick, and all following subsamples were each 1 cm thick. Push core samples from the first, third, and fifth centimeter depth were...
Categories: Data;
Tags: CMHRP,
Coastal and Marine Hazards and Resources Program,
Grizzly Bay,
PCMSC,
Pacific Coastal and Marine Science Center,
Bulk density was summarized from SSURGO and STATSGO tabular data, joined to source feature data from the NRCS, and then converted to an 800m raster using the cell center to assign the values. Bulk density values in g/cc were multiplied by 100 to create an integer raster.This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map...
This file contains soil data for 3 depths (0-0.5 meters, 0.5-1.5 meters, and greater than 1.5 meters) for percent sand, clay, and rockiness for the entire globe at a half degree grid resolution. A single bulk density value and mineral depth are also provided for each gridcell. Bulk density values came from the the International Geosphere Biosphere Programme (IGBP). Mineral depth, clay, sand, and rockiness values came from the International Satellite Land Surface Climatology Project (ISLSCP).
Data in the IGS' GeoLab database for w#84838: results for a bulk density analysis on a sample from 0.36 to 0.36 feet deep; and results for 4 grain size analyses on samples from 0.36 to 5.84 feet deep.
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