AndreaBozzo/ceres-open-data-index huggingface dataset:
Magnetotelluric sounding data, station 32, San Luis Valley, Colorado, 2007

This dataset includes the magnetotelluric (MT) sounding data collected in 2007 in and near the San Luis Valley, Colorado. The U.S. Geological Survey conducted a series of multidisciplinary studies, including MT surveys, in the San Luis Valley to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal groundwater aquifers of the Rio Grande rift. The shallow unconfined and the deeper confined Santa Fe Group aquifers in the San Luis Basin are the main sources of municipal water for the region. The population of the San Luis Valley region is growing rapidly and water shortfalls could have serious consequences. Future growth and land management in the region depend on accurate assessment and protection of the region's groundwater resources.

Tags: apparent-resistivity, aquifer, cggsc, colorado, conejos-county, crustal-geophysics-and-geochemistry-science-center, electromagnetic-surveying, geophysics, geoscientificinformation, gps-measurement, groundwater, hydrogeology, impedance, impedance-phase, impedance-strike, magnetic-field-earth, magnetic-surveying, magnetotelluric, mineral-resources-program, mrp, mt, rocky-mountains, san-luis-valley, sounding, tipper, usgs-5841e852e4b04fc80e518d13
Organization: Department of the Interior
Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2009

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher resistivity of sand, gravel, and other clay units found in the area, making it a very good target for TEM soundings. The top of the blue clay was found to have considerable relief suggesting the possibility of deformation of the clay during or after deposition. Because of rift activity deformation is to be expected. Of the TEM profiles made across faults identified by aeromagnetic data, some showed resistivity variations and (or) subsurface elevation relief of resistivity units suggestive of faulting. Such patterns were not associated with all suspected faults. The Hansen Bluff profile showed variations in resistivity and depth to conductor that coincide with a scarp between the highlands to the east and the floodplain of the Rio Grande River to the west.

Tags: alamosa-county, alamosa-national-wildlife-refuge, aquifer, clay, clay-deposits, colorado, electromagnetic-surveying, fault-detection, faulting-geologic, geophysics, geoscientificinformation, great-sand-dunes-national-park, great-sand-dunes-national-preserve, groundwater, saguache-county, san-luis-valley, subsurface-mapping, subsurface-maps, tem, transient-electromagnetic-sounding, usgs-5841eb15e4b04fc80e518d1f
Organization: Department of the Interior
Magnetotelluric sounding data, station 33, San Luis Valley, Colorado, 2007

This dataset includes the magnetotelluric (MT) sounding data collected in 2007 in and near the San Luis Valley, Colorado. The U.S. Geological Survey conducted a series of multidisciplinary studies, including MT surveys, in the San Luis Valley to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal groundwater aquifers of the Rio Grande rift. The shallow unconfined and the deeper confined Santa Fe Group aquifers in the San Luis Basin are the main sources of municipal water for the region. The population of the San Luis Valley region is growing rapidly and water shortfalls could have serious consequences. Future growth and land management in the region depend on accurate assessment and protection of the region's groundwater resources.

Tags: apparent-resistivity, aquifer, cggsc, colorado, costilla-county, crustal-geophysics-and-geochemistry-science-center, electromagnetic-surveying, geophysics, geoscientificinformation, gps-measurement, groundwater, hydrogeology, impedance, impedance-phase, impedance-strike, magnetic-field-earth, magnetic-surveying, magnetotelluric, mineral-resources-program, mrp, mt, rocky-mountains, san-luis-valley, sounding, tipper, usgs-5841eca0e4b04fc80e518d32
Organization: Department of the Interior
Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2009

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher resistivity of sand, gravel, and other clay units found in the area, making it a very good target for TEM soundings. The top of the blue clay was found to have considerable relief suggesting the possibility of deformation of the clay during or after deposition. Because of rift activity deformation is to be expected. Of the TEM profiles made across faults identified by aeromagnetic data, some showed resistivity variations and (or) subsurface elevation relief of resistivity units suggestive of faulting. Such patterns were not associated with all suspected faults. The Hansen Bluff profile showed variations in resistivity and depth to conductor that coincide with a scarp between the highlands to the east and the floodplain of the Rio Grande River to the west.

Tags: alamosa-county, alamosa-national-wildlife-refuge, aquifer, clay, clay-deposits, colorado, electromagnetic-surveying, fault-detection, faulting-geologic, geophysics, geoscientificinformation, great-sand-dunes-national-park, great-sand-dunes-national-preserve, groundwater, saguache-county, san-luis-valley, subsurface-mapping, subsurface-maps, tem, transient-electromagnetic-sounding, usgs-5841eddbe4b04fc80e518d34
Organization: Department of the Interior
Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2009

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher resistivity of sand, gravel, and other clay units found in the area, making it a very good target for TEM soundings. The top of the blue clay was found to have considerable relief suggesting the possibility of deformation of the clay during or after deposition. Because of rift activity deformation is to be expected. Of the TEM profiles made across faults identified by aeromagnetic data, some showed resistivity variations and (or) subsurface elevation relief of resistivity units suggestive of faulting. Such patterns were not associated with all suspected faults. The Hansen Bluff profile showed variations in resistivity and depth to conductor that coincide with a scarp between the highlands to the east and the floodplain of the Rio Grande River to the west.

Tags: alamosa-county, alamosa-national-wildlife-refuge, aquifer, clay, clay-deposits, colorado, electromagnetic-surveying, fault-detection, faulting-geologic, geophysics, geoscientificinformation, great-sand-dunes-national-park, great-sand-dunes-national-preserve, groundwater, saguache-county, san-luis-valley, subsurface-mapping, subsurface-maps, tem, transient-electromagnetic-sounding, usgs-5841ee6be4b04fc80e518d42
Organization: Department of the Interior
Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2009

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher resistivity of sand, gravel, and other clay units found in the area, making it a very good target for TEM soundings. The top of the blue clay was found to have considerable relief suggesting the possibility of deformation of the clay during or after deposition. Because of rift activity deformation is to be expected. Of the TEM profiles made across faults identified by aeromagnetic data, some showed resistivity variations and (or) subsurface elevation relief of resistivity units suggestive of faulting. Such patterns were not associated with all suspected faults. The Hansen Bluff profile showed variations in resistivity and depth to conductor that coincide with a scarp between the highlands to the east and the floodplain of the Rio Grande River to the west.

Tags: alamosa-county, alamosa-national-wildlife-refuge, aquifer, clay, clay-deposits, colorado, electromagnetic-surveying, fault-detection, faulting-geologic, geophysics, geoscientificinformation, great-sand-dunes-national-park, great-sand-dunes-national-preserve, groundwater, saguache-county, san-luis-valley, subsurface-mapping, subsurface-maps, tem, transient-electromagnetic-sounding, usgs-5841efd8e4b04fc80e518d4b
Organization: Department of the Interior
Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2011

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher resistivity of sand, gravel, and other clay units found in the area, making it a very good target for TEM soundings. The top of the blue clay was found to have considerable relief suggesting the possibility of deformation of the clay during or after deposition. Because of rift activity deformation is to be expected. Of the TEM profiles made across faults identified by aeromagnetic data, some showed resistivity variations and (or) subsurface elevation relief of resistivity units suggestive of faulting. Such patterns were not associated with all suspected faults. The Hansen Bluff profile showed variations in resistivity and depth to conductor that coincide with a scarp between the highlands to the east and the floodplain of the Rio Grande River to the west.

Tags: alamosa-county, alamosa-national-wildlife-refuge, aquifer, clay, clay-deposits, colorado, electromagnetic-surveying, fault-detection, faulting-geologic, geophysics, geoscientificinformation, great-sand-dunes-national-park, great-sand-dunes-national-preserve, groundwater, saguache-county, san-luis-valley, subsurface-mapping, subsurface-maps, tem, transient-electromagnetic-sounding, usgs-5841f485e4b04fc80e518d65
Organization: Department of the Interior
Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2011

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher resistivity of sand, gravel, and other clay units found in the area, making it a very good target for TEM soundings. The top of the blue clay was found to have considerable relief suggesting the possibility of deformation of the clay during or after deposition. Because of rift activity deformation is to be expected. Of the TEM profiles made across faults identified by aeromagnetic data, some showed resistivity variations and (or) subsurface elevation relief of resistivity units suggestive of faulting. Such patterns were not associated with all suspected faults. The Hansen Bluff profile showed variations in resistivity and depth to conductor that coincide with a scarp between the highlands to the east and the floodplain of the Rio Grande River to the west.

Tags: alamosa-county, alamosa-national-wildlife-refuge, aquifer, clay, clay-deposits, colorado, electromagnetic-surveying, fault-detection, faulting-geologic, geophysics, geoscientificinformation, great-sand-dunes-national-park, great-sand-dunes-national-preserve, groundwater, saguache-county, san-luis-valley, subsurface-mapping, subsurface-maps, tem, transient-electromagnetic-sounding, usgs-5841f4a6e4b04fc80e518d68
Organization: Department of the Interior
Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2011

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher resistivity of sand, gravel, and other clay units found in the area, making it a very good target for TEM soundings. The top of the blue clay was found to have considerable relief suggesting the possibility of deformation of the clay during or after deposition. Because of rift activity deformation is to be expected. Of the TEM profiles made across faults identified by aeromagnetic data, some showed resistivity variations and (or) subsurface elevation relief of resistivity units suggestive of faulting. Such patterns were not associated with all suspected faults. The Hansen Bluff profile showed variations in resistivity and depth to conductor that coincide with a scarp between the highlands to the east and the floodplain of the Rio Grande River to the west.

Tags: alamosa-county, alamosa-national-wildlife-refuge, aquifer, clay, clay-deposits, colorado, electromagnetic-surveying, fault-detection, faulting-geologic, geophysics, geoscientificinformation, great-sand-dunes-national-park, great-sand-dunes-national-preserve, groundwater, saguache-county, san-luis-valley, subsurface-mapping, subsurface-maps, tem, transient-electromagnetic-sounding, usgs-5841f4f5e4b04fc80e518d6d
Organization: Department of the Interior
Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2011

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher resistivity of sand, gravel, and other clay units found in the area, making it a very good target for TEM soundings. The top of the blue clay was found to have considerable relief suggesting the possibility of deformation of the clay during or after deposition. Because of rift activity deformation is to be expected. Of the TEM profiles made across faults identified by aeromagnetic data, some showed resistivity variations and (or) subsurface elevation relief of resistivity units suggestive of faulting. Such patterns were not associated with all suspected faults. The Hansen Bluff profile showed variations in resistivity and depth to conductor that coincide with a scarp between the highlands to the east and the floodplain of the Rio Grande River to the west.

Tags: alamosa-county, alamosa-national-wildlife-refuge, aquifer, clay, clay-deposits, colorado, electromagnetic-surveying, fault-detection, faulting-geologic, geophysics, geoscientificinformation, great-sand-dunes-national-park, great-sand-dunes-national-preserve, groundwater, saguache-county, san-luis-valley, subsurface-mapping, subsurface-maps, tem, transient-electromagnetic-sounding, usgs-5841f545e4b04fc80e518d70
Organization: Department of the Interior
Data for assessing the status of sediment toxicity and macroinvertebrate communities in the Eighteenmile Creek Area of Concern, New York, 2014

Data from 10-day sediment toxicity tests of bed sediments from the Eighteenmile Creek Area of Concern and Oak Orchard Creek (nearby reference stream), Niagara and Orleans County, New York, respectively. Specifically, the data was used to compare the survival and growth of two macroinvertebrate species in sediments from study sites and laboratory controls. Results are from 10-day sediment exposures of two test species, Chironomus dilutus and Hyalella azteca. Sediment samples were collected from five sites on each stream. Bed-sediments were collected from depositional areas using a petite Ponar (0.03 square meter) dredge. At each site, approximately five grabs were composited into a bucket, mixed, and a 4-liter (L) subsample was stored in a polyethylene container. Sediment toxicity testing were then conducted by a contract laboratory to quantify toxicity with the dipteran, Chironomus dilutus, and the amphipod, Hyalella azteca, during 10-day survival and growth bioassays following USEPA test methods 100.2 and 100.1, respectively. U.S. Environmental Protection Agency, 2000, Methods for measuring the toxicity and bioaccumulation of sediment associated contaminants with freshwater invertebrates. Second edition: U.S. Environmental Protection Agency, Office of Research and Development EPA 600/R-99/064. This spreadsheet contains 13 columns. The first 7 columns describe the sample collection information, the remaining 6 columns provide the survival and growth results of two test species used in sediment toxicity tests. The data include the stream name, site ID, latitude and longitude, replicate number, and site type. Six columns of results from 10-day sediment exposures of two test species, Chironomus dilutus and Hyalella azteca. The following endpoints were measured for each species following the 10-day exposure: number of surviving organisms, percentage of organisms surviving (hereafter survival), and average ash-free dry weight of the surviving organisms (hereafter growth).

Tags: benthic-ecosystems, contamination-and-pollution, lake-ontario, niagara-county, orleans-county, usgs-5841f7ade4b04fc80e518d83
Organization: Department of the Interior
USGS Measurements of Water Quality in San Francisco Bay (CA), 1969-2015

The U.S. Geological Survey maintains a program of water-quality studies in San Francisco Bay (CA) that began in 1969. We plan a USGS Data Release to archive and make available all measurements made from 1969 through 2015. Water-quality constituents include salinity, temperature, light attenuation coefficient, and concentrations of chlorophyll-a, dissolved oxygen, suspended particulate matter, nitrate, nitrite, ammonium, silicate and phosphate. Water samples are collected at 37 fixed sampling locations along a 145-km transect from lower South San Francisco Bayo the lower Sacramento River. A map of sampling locations is available on the project website at: https://sfbay.wr.usgs.gov/access/wqdata/overview/wherewhen/stnmap.html

Tags: chlorophyll-a, dissolved-oxygen, nutrients, salinity, temperature, turbidity, usgs-5841f97ee4b04fc80e518d9f, water-quality
Organization: Department of the Interior
Magnetotelluric sounding data, station 34, San Luis Valley, Colorado, 2007

This dataset includes the magnetotelluric (MT) sounding data collected in 2007 in and near the San Luis Valley, Colorado. The U.S. Geological Survey conducted a series of multidisciplinary studies, including MT surveys, in the San Luis Valley to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal groundwater aquifers of the Rio Grande rift. The shallow unconfined and the deeper confined Santa Fe Group aquifers in the San Luis Basin are the main sources of municipal water for the region. The population of the San Luis Valley region is growing rapidly and water shortfalls could have serious consequences. Future growth and land management in the region depend on accurate assessment and protection of the region's groundwater resources.

Tags: apparent-resistivity, aquifer, cggsc, colorado, costilla-county, crustal-geophysics-and-geochemistry-science-center, electromagnetic-surveying, geophysics, geoscientificinformation, gps-measurement, groundwater, hydrogeology, impedance, impedance-phase, impedance-strike, magnetic-field-earth, magnetic-surveying, magnetotelluric, mineral-resources-program, mrp, mt, rocky-mountains, san-luis-valley, sounding, tipper, usgs-5841fe14e4b04fc80e518dc4
Organization: Department of the Interior