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Passive seismic data collection was done northwest of the Air Force Research Laboratory (AFRL) at Edwards Air Force Base using the horizontal-to-vertical spectral ratio (HVSR) technique. HVSR surveys were done at 43 locations between May and September 2018 to refine the understanding of the bedrock-alluvial aquifer transition zone downgradient from the AFRL. Specifically, the data were collected to help determine the depth to bedrock. The HVSR method is a passive seismic technique that uses a three-component seismometer to measure the vertical and horizontal components of ambient seismic noise. Seismic noise in the range of ~0.1 to 1 Hertz (Hz) is caused by ocean waves, large regional storms, and tectonic sources....
Categories: Data;
Tags: Antelope-Fremont Valleys,
Boron,
California,
Edwards Air Force Base,
Kern County,
This dataset contains field measurements of lakebed groundwater temperatures collected during three surveys in July 2008, August 2014, and August 2015, by using a handheld thermocouple probe and GPS at a permeable reactive barrier at Ashumet Pond, Falmouth, MA. The comma-separated file includes unique site identifiers, locations of measurement points, temperatures, dates, and types of measurement (groundwater, surface water, or control). Also included are ESRI raster datasets for each measurement date for (1) interpolated lakebed groundwater temperatures, and (2) interpolated lakebed groundwater temperatures normalized to the surface water temperature at the time of measurement. This data release is provided...
This dataset contains field measurements of temperature in shallow vertical profiles beneath a lake-bottom in the vicinity of a permeable reactive barrier (PRB) at Ashumet Pond, Falmouth, MA. From August 21, 2015 – September 3, 2015 vertical temperature profilers designed to quantify groundwater upwelling dynamics were installed at seven locations. Hollow stainless steel pipes (2.5 cm OD) were slotted horizontally to allow installation of iButton thermal data loggers (Maxim Integrated DS1922L, 0.0625 oC precision) protected with waterproof silicone caulking. The temperature profilers were gently tapped into the cobbly bed by first driving guide-hole of slightly smaller diameter. After installation, the thermal loggers...
Categories: Data;
Tags: Cape Cod,
Falmouth,
Massachusetts,
groundwater,
groundwater and surface-water interaction,
In 2022, the U.S. Geological Survey (USGS) in cooperation with the New Hampshire Department of Transportation (NHDOT) made 107 horizontal-to-vertical spectral ratio (HVSR) passive seismic geophysical measurements at four transportation infrastructure sites in New Hampshire to determine the benefits of HVSR as an enhancement to traditional geotechnical site characterizations performed by NHDOT. Typically, data are obtained from the subsurface during borings to characterize geotechnical properties but often borings are spaced hundreds of feet apart. Geotechnical site characterization guided by geophysical surveys (such as the HVSR method) between borings will help provide a more thorough characterization. By combining...
Categories: Data;
Tags: Canterbury, NH,
Geophysics,
Geophysics,
Groundwater,
Horizontal-to-Vertical Spectral Ratio (HVSR) Seismic,
Time-domain electromagnetic (TEM) surveys were done northwest of the Air Force Research Laboratory (AFRL) at Edwards Air Force Base. TEM surveys were done at 33 locations between May and October 2018 to refine the understanding of the bedrock-alluvial aquifer transition zone downgradient from the AFRL. TEM surveys (also called transient electromagnetic surveys) provide 1D resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the TEM method, electrical current is cycled through a transmitter loop (Tx) wire, which in turn produces a primary magnetic field. When the current is abruptly terminated, a secondary magnetic field is induced in the earth, and it moves downward and...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service,
Shapefile;
Tags: Antelope-Fremont Valleys,
Boron,
California,
Edwards Air Force Base,
Kern County,
This dataset contains field measurements of direct groundwater seepage by using half-barrel style seepage meters permanently installed in a lake-bottom permeable reactive barrier (PRB) at Ashumet Pond, Falmouth, MA. The meters are a modified version of a standard half-barrel seepage meter. Each meter consists of a 208-L polyethylene, corrosion-inhibiting drum cut to a length of 0.8 m and fitted with a removable 0.56-m-diameter lid. A 1.3-cm-diameter hole was drilled into each lid to allow outflow or inflow to be measured. During installation, the top rim of each barrel was positioned to be at the expected grade after backfilling. Between 2004 and 2015, seepage rates at each meter were measured annually, with the...
Categories: Data;
Tags: Cape Cod,
Falmouth,
Massachusetts,
groundwater,
groundwater and surface-water interaction,
This data release includes comma-delimited datafiles (.CSV files) and geospatial datasets (GIS shapefile and raster datasets) from a survey of lake-bottom temperatures using a Fiber-Optic Distributed Temperature Sensing (FO-DTS) system in May 2007. The distribution of lakebed temperatures was determined over an 18-hour period in May 2007 using a LIOS fiber-optic distributed temperature sensing (FO-DTS) system (LIOS Technology, Cologne, Germany) connected to a 1000-m-long fiber cable shielded with rubberized armoring. The FO-DTS system measures temperature by means of optical fibers that function as linear sensors of temperature dependent laser light backscatter, producing temperature values to an accuracy of 0.01oC...
Water levels in Goose Pond were collected while collecting geophysical surveys in May 2017. Three transducers were set to monitor the change in water level associated with tidal changes.
In summer in Massachusetts, USA, preferential groundwater discharge zones are often colder than adjacent streambed areas that do not have substantial discharge. Therefore, discharge zones can efficiently be identified and mapped over space using heat as a tracer. This data release contains fiber-optic distributed temperature sensing (FO-DTS) data collected along the streambed interface of the main channel and tributaries of the upper Quashnet River, within approximately 1 km of Johns Pond, from June 14 to June 20, 2020. For these deployments a Salixa XT-DTS control unit (Salixa Ltd, Hertfordshire, UK) was used, and measurements were made over several day increments at 0.508 m linear resolution. Specific locations...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Cape Cod,
Groundwater,
Mashpee,
Massachusetts,
Quashnet River,
Surface and water-borne geophysical methods can provide information for the characterization of the subsurface structure of the earth for aquifer investigations. Floating and towed transient electromagnetic (FloaTEM and tTEM) surveys provide resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the TEM method, a primary electrical current is cycled through a wire in a transmitter loop (Tx), which in turn produces a static primary magnetic field. When the current in the TX loop is abruptly terminated, secondary electrical currents are induced in the earth that move downward and outward decaying with time. The decay of the secondary electrical field is controlled by the subsurface...
From June 25 to June 28, 2018, the U.S. Environmental Protection Agency (EPA) collected temperature measurements to help evaluate the thermal properties at two locations along the shoreline of City Lake in Fredericktown, MO. The in-situ temperature of surface water and saturated sediments was monitored to support calculations of seepage flux. Temperature measurements Celsius were collected every 30 minutes at depths of 0.04, 0.15,0.30,0.61, and 0.91 m below the water bottom. The thermal conductivity of saturated sediments was also measured.
Categories: Data;
Tags: Forward Looking Infrared (FLIR) imagery,
Groundwater,
Missouri,
environment,
geophysics,
Borehole geophysical logs were collected to characterize bedrock aquifers at three contamination sites located in California, Wisconsin, and New Jersey. The data were collected by the U.S. Geological Survey (USGS) and the University of Guelph from 2014 to 2015 as part of the U.S. Department of Defense Strategic Environmental Research and Development Program (SERDP) and Environmental Security Technology Certification Program (ESTCP) initiatives to apply geophysical methods at fractured-rock sites contaminated with chlorinated solvents. Logs were collected in open boreholes completed in fractured rock. Each borehole was logged with natural gamma, electromagnetic induction, normal resistivity, single-point resistance,...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service,
Shapefile;
Tags: USGS Science Data Catalog (SDC),
none
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