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Geology: Recent submissions
Now showing items 221-240 of 480
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A Note on the Goochland County, Virginia, Earthquake of March 15, 1991
(Seismological Society of America, 1991-07-01)The Goochland county, Virginia, earthquake of March 15, 1991 (mb (Lg) = 3.8), was the largest earthquake recorded in the central Virginia seismic zone (CVSZ) since the Cunningham, Virginia, earthquake of 1984 (mb(Lg) = ... -
Vertical Fracture Detection by Exploiting the Polarization Properties of GPR Signal
(Society of Exploration Geophysicists, 2004-05-01)Vertically oriented thin fractures are not always detected by conventional single‐polarization reflection profiling ground‐penetrating radar (GPR) techniques. We study the polarization properties of EM wavefields and suggest ... -
Micro-earthquakes in Kansas and Nebraska 1977–87
(Seismological Society of America, 1988-10-01)The Kansas Geological Survey has operated a microearthquake seismograph network since mid-1977. The network now consists of fifteen stations located in the eastern half of Kansas and Nebraska. Locatable microearthquakes ... -
A useful resorting in surface wave method with the Autojuggie
(Society of Exploration Geophysicists, 2003-11-01) -
An algorithm for U-Pb isotope dilution data reduction and uncertainty propagation
(American Geophysical Union, 2011-06-01)High-precision U-Pb geochronology by isotope dilution-thermal ionization mass spectrometry is integral to a variety of Earth science disciplines, but its ultimate resolving power is quantified by the uncertainties of ... -
Understanding the application of Raman spectroscopy to the detection of traces of life
(Mary Ann Liebert, 2010-03-01)Investigating carbonaceous microstructures and material in Earth's oldest sedimentary rocks is an essential part of tracing the origins of life on our planet; furthermore, it is important for developing techniques to search ... -
Carotenoid analysis of Halophilic Archaea by Resonance Raman spectroscopy
(Mary Ann Liebert, 2007-08-27)Recently, halite and sulfate evaporate rocks have been discovered on Mars by the NASA rovers, Spirit and Opportunity. It is reasonable to propose that halophilic microorganisms could have potentially flourished in these ... -
Simple time-variant filtering by operator scaling
(Society of Exploration Geophysicists, 1995-09-01)A convolutional method of time‐variant, band‐pass filtering presented shows that a change of filter cutoff frequencies with time is achieved by frequency scaling the amplitude spectrum of a reference operator. According ... -
Seismic reflection investigations of sinkholes beneath Interstate Highway 70 in Kansas
(Society of Exploration Geophysicists, 1986-02-01)Seismic reflection studies were performed across actively developing sinkholes located astride Interstate Highway 70 in Russell County, Kansas. Results indicate that high‐resolution seismic reflection surveys are useful ... -
Recording seismic reflections using rigidly interconnected geophones
(Society of Exploration Geophysicists, 2001-11-01)Ultrashallow seismic reflection surveys require dense spatial sampling during data acquisition, which increases their cost. In previous efforts to find ways to reduce these costs, we connected geophones rigidly to pieces ... -
Muting the noise cone in near-surface reflection data: An example from southeastern Kansas
(Society of Exploration Geophysicists, 1998-07-01)A 300-m near‐surface seismic reflection profile was collected in southeastern Kansas to locate a fault(s) associated with a recognized stratigraphic offset on either side of a region of unexposed bedrock. A substantial ... -
Migration of shallow reflection data
(Society of Exploration Geophysicists, 1994-03-01)We present an analysis of migration effects on seismic reflection images of very shallow targets such as those that are common objectives of engineering, groundwater, and environmental investigations. We use an example of ... -
Mapping a bedrock surface under dry alluvium with shallow seismic reflections
(Society of Exploration Geophysicists, 1989-12-01)Shallow seismic‐reflection techniques were used to image the bedrock‐alluvial interface, near a chemical evaporation pond in the Texas Panhandle, allowing optimum placement of water‐quality monitor wells. The seismic data ... -
Joint analysis of refractions with surface waves: An inverse solution to the refraction-traveltime problem
(Society of Exploration Geophysicists, 2006-11-01)We describe a possible solution to the inverse refraction-traveltime problem (IRTP) that reduces the range of possible solutions (nonuniqueness). This approach uses a reference model, derived from surface-wave shear-wave ... -
In-situ, high-frequency P-Wave velocity measurements within 1 m of the Earth’s surface
(Society of Exploration Geophysicists, 1999-03-01)Seismic P-wave velocities in near‐surface materials can be much slower than the speed of sound waves in air (normally 335 m/s or 1100 ft/s). Difficulties often arise when measuring these low‐velocity P-waves because of ... -
High-resolution common depth point seismic reflection profiling: instrumentation
(Society of Exploration Geophysicists, 1986-02-01)Seismic recording hardware must be a deliberately designed system to extract and record high‐resolution information faithfully. The single most critical element of this system is the detector. The detector chosen must be ... -
High-resolution common depth point seismic reflection profiling: field acquisition parameter design
(Society of Exploration Geophysicists, 1986-02-01)The results of a seismic reflection profiling exercise are strongly dependent upon parameters used in field recording. The choice of parameters is determined by objectives of the survey, available resources, and geologic ... -
Geophones on a board
(Society of Exploration Geophysicists, 1999-05-01)We examined the feasibility of using seismic reflections to image the upper 10 m of the earth’s surface quickly and effectively by rigidly attaching geophones to a wooden board at 5-cm intervals. The shallow seismic ... -
Field investigation of Love-waves in near-surface seismology
(Society of Exploration Geophysicists, 2008-05-01)We examine subsurface conditions and survey parameters suitable for successful exploitation of Love waves in near-surface investigations. Love-wave generation requires the existence of a low shear-velocity surface layer. ... -
Field comparison of shallow seismic sources near Chino, California
(Society of Exploration Geophysicists, 1992-05-01)Data from a shallow seismic‐source comparison test conducted in an area with a water‐table depth in excess of 30 m and near‐surface velocities less than 330 m/s were acquired from 13 different sources at a single site near ...
