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Geology: Recent submissions

Now showing items 241-260 of 480

    • Field comparison of shallow P-Wave seismic sources near Houston, Texas 

      Miller, Richard D.; Pullan, Susan E.; Steeples, Don W.; Hunter, James A. (Society of Exploration Geophysicists, 1994-11-01)
      A shallow P‐wave seismic source comparison was conducted at a site near Houston, Texas where the depth to the water table was approximately 7 m, and near‐surface materials consisted of clays, sands, and gravels. Data from ...

    • Engineering and environmental geophysics at the millennium 

      Steeples, Don W. (Society of Exploration Geophysicists, 2001-01-01)
      Near‐surface geophysics is being applied to a broader spectrum of problems than ever before, and new application areas are arising continually. Currently, the tools used to examine the near‐surface environment include a ...

    • Effects of soil-moisture content on shallow seismic data 

      Jefferson, Robert D.; Steeples, Don W.; Black, Ross A.; Carr, Tim (Society of Exploration Geophysicists, 1998-07-01)
      Repeated shallow‐seismic experiments were conducted at a site on days with different near‐surface moisture conditions in unconsolidated material. Experimental field parameters remained constant to ensure comparability of ...

    • Avoiding pitfalls in shallow seismic reflection surveys 

      Steeples, Don W.; Miller, Richard D. (Society of Exploration Geophysicists, 1998-07-01)
      Acquiring shallow reflection data requires the use of high frequencies, preferably accompanied by broad bandwidths. Problems that sometimes arise with this type of seismic information include spatial aliasing of ground ...

    • Acquisition and processing pitfall associated with the clipping of near-surface seismic reflection traces 

      Sloan, Steven D.; Steeples, Don W.; Malin, Peter E. (Society of Exploration Geophysicists, 2008-01-01)
      The processing of clipped seismic traces may produce high-frequency wavelets that can be misinterpreted as reflections in filtered shot gathers and common-midpoint (CMP) stacked sections. To illustrate this effect, a ...

    • A shallow seismic reflection survey in basalts of the Snake River Plain, Idaho 

      Miller, Richard D.; Steeples, Don W. (Society of Exploration Geophysicists, 1990-06-01)
      The objective of this feasibility study was to determine if the seismic reflection method could help to optimize placement of water‐quality monitoring wells near a radioactive storage facility. Seismic reflections from ...

    • A field investigation of source parameters for the sledgehammer 

      Keiswetter, Dean; Steeples, Don W. (Society of Exploration Geophysicists, 1995-07-01)
      We examined amplitude and frequency changes in shallow seismic‐reflection data associated with simple source‐parameter modifications for the sledgehammer. Seismic data acquired at three sites with different near‐surface ...

    • Toward the autojuggie: Planting 72 geophones in 2 seconds 

      Steeples, Don W.; Baker, Gregory S.; Schmeissner, Chris M. (American Geophysical Union, 1999-04-15)
      Shallow seismic reflection surveys require dense spatial wave-field sampling, contributing to their high cost. To assess the feasibility of planting geophones automatically, we planted 72 geophones in approximately 2 s in ...

    • Shallow structure from a seismic reflection profile across the Borah Peak, Idaho, fault scarp 

      Miller, Richard D.; Steeples, Don W. (American Geophysical Union, 1986-09-01)
      A short 12-fold CDP seismic-reflection survey was performed along the road to Doublespring Pass across the fault scarp formed by the October 28, 1983, magnitude-7.3, Idaho earthquake. This high-resolution reflection survey ...

    • Shallow seismic reflection profile of the Meers fault, Comanche County, Oklahoma 

      Myers, Paul B.; Miller, Richard D.; Steeples, Don W. (American Geophysical Union, 1987-07-01)
      A high-resolution seismic-reflection survey was conducted across the Meers fault in Comanche County, Oklahoma, in an attempt to determine the shallow structure associated with the fault zone. A downhole .50-caliber rifle ...

    • Shallow faults mapped with seismic reflections: Lost River Fault, Idaho 

      Mubarik, Ali; Miller, Richard D.; Steeples, Don W. (American Geophysical Union, 1991-09-01)
      A high-resolution seismic-reflection survey, conducted at the intersection of Arentson Gulch road and the western splay of the Lost River fault scarp in central Idaho, defines a bedrock surface about 80 m deep which is ...

    • Seismic reflections from depths of less than two meters 

      Baker, Gregory S.; Schmeissner, Chris M.; Steeples, Don W.; Plumb, Richard G. (American Geophysical Union, 1999-01-01)
      Three distinct seismic reflections were obtained from within the upper 2.1 m of flood-plain alluvium in the Arkansas River valley near Great Bend, Kansas. Reflections were observed at depths of 0.63, 1.46, and 2.10 m and ...

    • Recording wind microstructure with a seismograph 

      Steeples, Don W.; Schmeissner, Chris M.; Macy, Brian (American Geophysical Union, 1997-10-01)
      In an effort to characterize the effects of atmospheric waves on seismic sensors at the surface of the earth, we used geophones to perform some simple experiments allowing us to “watch” the wind. By examining the wind noise ...

    • Practical modifications to improve the sledgehammer source 

      Keiswetter, Dean; Steeples, Don W. (American Geophysical Union, 1994-10-01)
      We have examined frequency and amplitude changes in high-resolution seismic-reflection data associated with practical modifications to the sledgehammer method. Our seismic data, acquired at three sites with different ...

    • Near-surface imaging using coincident seismic and GPR data 

      Baker, Gregory S.; Steeples, Don W.; Schmeissner, Chris M.; Pavlovic, Mario; Plumb, Richard G. (American Geophysical Union, 2001-02-15)
      In many near-surface applications, detailed subsurface characterization is important. Characterization often is obtained using ground-penetrating radar (GPR) or shallow seismic-reflection (SSR) imaging methods, depending ...

    • Near-surface common-midpoint seismic data recorded with automatically planted geophones 

      Spikes, Kyle T.; Vincent, Paul D.; Steeples, Don W. (American Geophysical Union, 2005-10-05)
      [1] We introduce the Autojuggie II as a device to speed the emplacement of geophones for near-surface seismic common-midpoint (CMP) surveys. Hydraulic cylinders force rigidly interconnected geophones into the ground ...

    • Source-dependent frequency content of ultrashallow seismic reflection data 

      Baker, Gregory S.; Steeples, Don W.; Schmeissner, Chris M.; Spikes, Kyle T. (Seismological Society of America, 2000-04-01)
      Seismic surveying within the upper few meters of the Earth's shallow subsurface requires a high-frequency source. To ascertain the important features of such sources, experiments were conducted at test sites in central and ...

    • Far-field aftershocks of the 1906 earthquake 

      Steeples, Don W.; Steeples, Dan D. (Seismological Society of America, 1996-08-01)
      During the 24 hr following the great San Francisco, California, earthquake of 18 April 1906, separate seismic events were felt at Paisley, Oregon; Phoenix, Arizona; Los Angeles, California; and Brawley, California (MMIX). ...

    • Shear measurements across the northern margin of Whillans Ice Stream 

      van der Veen, Cornelis J.; Jezek, Kenneth C.; Stearns, Leigh A. (International Glaciological Society, 2007-01-01)
      Field measurements of surface deformation across the northern shear margin of Whillans Ice Stream, West Antarctica, were analyzed to better understand the processes controlling the position and migration of this margin. ...

    • Quantitative estimates of velocity sensitivity to surface melt variations at a large Greenland outlet glacier 

      Andersen, Morten L.; Nettles, Meredith; Larsen, Tine B.; Hamilton, Gordon S.; Stearns, Leigh A.; Elosegui, Pedro (International Glaciological Society, 2011-09-01)
      The flow speed of Greenland outlet glaciers is governed by several factors, the relative importance of which is poorly understood. The delivery of surface-generated meltwater to the bed of alpine glaciers has been shown ...