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The Great Basin Center
has a full range of geologic, geochemical, geophysical, and geodetic
field equipment, and the expertise to use it. This ranges from
individual field mapping equipment to large multi-element seismic
and geodesic arrays.
Besides the standard
compass, rock pick and hand lens, field work at the Center employs
state-of-the-art hand held IPAQ minicomputers with attached GPS
units and field GIS software (pictured at left) that allows for
detailed, accurate digital mapping that can be uploaded into a
spatial GIS database without significant intermediate processing.
The mini-computer can be pre-loaded with digital topographic maps,
remotely sensed imagery, and/or sample data that can serve as the
information base upon which the current mapping can be added. |
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For seismic
projects, the Nevada Seismological
Laboratory has 48 channels of "grouped" 100-Hz high-frequency
reflection geophones, (pictured at right) in Warm Springs
Valley, Nevada. Additional geophysical
equipment available at MSM to image
the subsurface include more than three dozen state-of-the-art high-dynamic-range
digital seismic stations, 15 portable Reftek seismographs, eight portable
digital seismographs, numerous broadband seismometers, a modern
gravimeter, and several geodetic global positioning system
receivers. |
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High-accuracy
geodetic measurements are available from the
Nevada Geodesic
Laboratory via its GPS networks (pictured at left), which are
especially helpful in determining current tectonic strain in the
Great Basin and isolating its effects on geothermal systems.
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The
Arthur
Brant Laboratory for Exploration Geophysics has two field
spectrometers used in calibrating remote-sensing imagery, one for
measuring reflected solar and infrared radiation and one for
measuring emitted thermal radiation. This information is important
in ensuring the accuracy of remotely sensed data. At right, Chris Kratt measures the spectral signature of rocks near Pyramid Lake. |
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Temperature and temperature gradient
measurements of wells are made using a custom-designed down-hole
temperature probe. Down-hole temperatures can be recorded to
depths of up to one kilometer. |
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The Great
Basin Center, together with the
Nevada Bureau of Mines and Geology has standardized geochemical
sampling equipment needed to collect water and gas samples from
geothermal springs and wells. This geochemical data is critical in
estimating the temperatures of subsurface geothermal reservoirs,
which helps guide high-temperature geothermal system exploration. At
right, NBMG technician Lane Meyer samples a hot well in western Nevada. |
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A new spin
on an old technique: the Great Basin Center is perfecting a method
to rapidly measure temperatures at a two meter depth, below the zone
of daily temperature variation. The method consists of pounding 1/2"
hollow steel rods into the ground using a demolition hammer,
inserting a resistant temperature device (RTD) into the rod, and
then measuring the temperature after a short equilibration time (see
paper). This method has identified thermal anomalies in areas devoid
of other surface indicators such as thermal springs or wells (see
story). Mark Coolbaugh, Chris Kratt, Robin Penfield, Chris Sladek,
and Rick Zehner (shown at left) have pioneered this technique. |
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