Filters: Tags: East Falmouth (X)
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This dataset contains high-resolution digital photographs of sediment cores collected from a boring drilled to bedrock near Nantucket Sound in East Falmouth, Cape Cod, Massachusetts. Following collection and transportation to a processing facility, the upper half of each core was scraped to form a flat surface along the length of the core. Digital photographs were taken of 8-inch (20-centimeter) sections of each core. The digital images were composited by using Adobe Illustrator to create a photographic log of each core. Abbreviations used in this metadata file: cm, centimeter; mm, millimeter; ft, foot; in., inch. This data release is associated with the following publications: Hull, R.B, Johnson, C.D., Stone,...
On June 5, 2015, transient electromagnetic (TEM) data were acquired on the baseball field at the East Falmouth, Massachusetts Elementary School approximately 30 m north the well MA-FWS-750. Transient electromagnetic induction (TEM) surveys provide resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. Electrical current is cycled through a wire placed on the land surface in a transmitter loop (Tx), which in turn produces a static magnetic field. When the current is abruptly terminated, an instantaneous current is induced in the earth, and it moves downward and outward as the induced current decays with time. The decay is controlled by the resistivity of the earth. One or more...
Lithostratigraphic and hydrogeologic observations for the unconfined aquifer of western Cape Cod are limited near coastal groundwater-discharge areas. In spring 2015, a 310-foot-deep boring was drilled and a well was installed to 100 feet below land surface to facilitate detailed study of aquifer characteristics along the southern coast of Cape Cod. Characteristics of interest included the depth and character of the freshwater/saltwater interface and bedrock surface, and vertical variations in grain size, bedding structure, and hydraulic conductivity. Sediment cores were collected from land surface to the bedrock surface at 305 feet below land surface. Bedrock cores were collected from 305 to 310 feet below land...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: East Falmouth,
Freshwater/Saltwater Interface,
Hydrogeology,
Lithology,
Lithostratigraphy,
This dataset presents descriptions of sediments collected from a boring drilled to bedrock near Nantucket Sound in East Falmouth, Cape Cod, Massachusetts. There are four types of descriptions—units, features, subsamples, and grain-size distributions: 1) Units correspond to “lithostratigraphic units” described by Hull and others (2019). Units are vertically continuous zones of generally similar sediment type. They range from 1 to 100 feet thick. The top and bottom of each unit is given in feet relative to depth below land surface. 2) Features are described as “lithostratigraphic features” by Hull and others (2019). Features are discrete zones of very similar sediment 0.1 to 5.0 feet thick. A single unit can encompass...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: East Falmouth,
Quaternary,
earth history,
groundwater,
hydrology,
In March 2016, the U.S. Geological Survey drilled a borehole, MA-FSW-750-0100, through the unconsolidated sediments and 1.5 m into the bedrock in East Falmouth, Massachusetts, to improve understanding of the glacial history and hydrologic properties of the Cape Cod aquifer. Prior to drilling, candidate sites were investigated using surface geophysical methods. Passive seismic horizontal-to-vertical spectral ratio (HVSR) methods were used to estimate the depth of the unconsolidated deposits over bedrock. Transient electromagnetic (TEM) surveys were conducted to characterize the lithology and salinity of formation water in the subsurface, which was used to plan the borehole completion. The specific conductance of...
A pulsed magnetic resonance borehole tool was used to characterize hydraulic properties of the aquifer. Borehole nuclear magnetic resonance (bNMR) logs were collected to measure the water content and to estimate the pore-size distribution and hydraulic conductivity (K) over the depth of the borehole. The bNMR data were collected July 25-26, 2016, and were processed August 2016.
In March 2016, the U.S. Geological Survey drilled a borehole, MA-FSW-750, through the unconsolidated sediments and 1.5 m into the bedrock in East Falmouth, Massachusetts, to improve understanding of the glacial history and hydrologic properties of the Cape Cod aquifer. Polyvinyl casing was set through the overburden and into the bedrock. About 10 days after borehole MA-FSW-750 was drilled, it was logged with geophysical methods including natural gamma radiation and electromagnetic induction (EMI) logs to identify changes in the lithology and fluid properties of the subsurface. In addition, the gamma and EMI logs were collected about 100 days after drilling, which allowed the drilling fluids to be displaced and natural...
Passive seismic horizontal-to-vertical spectral ratio (HVSR) methods were used to estimate the depth of the unconsolidated deposits over bedrock. The HVSR method uses a three-component seismometer to measure the vertical and two 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. A resonance frequency (f0) is induced in the unconsolidated deposits when there is a substantial contrast (> 2:1) in shear-wave acoustic impedance between the overburden and the bedrock. The f0 is determined from the analysis of the spectral ratio of the horizontal and vertical components of the seismic data. The thickness...
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