scholarly journals AN EVALUATION OF SUBSURFACE STRUCTURE WITH INCLINED BEDROCK USING MICROTREMOR ARRAY EXPLORATION

2013 ◽  
Vol 78 (688) ◽  
pp. 1081-1088 ◽  
Author(s):  
Kentaro MOTOKI ◽  
Tetsushi WATANABE ◽  
Kenichi KATO ◽  
Kojiro TAKESUE ◽  
Hiroaki YAMANAKA ◽  
...  
Keyword(s):  
Subsurface Structure ◽  
Microtremor Array Exploration

scholarly journals Effect of vegetation cover and sediment type on 3D subsurface structure and shear strength in saltmarshes

2021 ◽  
Author(s):  
Clementine Chirol ◽  
Kate L. Spencer ◽  
Simon J. Carr ◽  
Iris Möller ◽  
Ben Evans ◽  
...  
Keyword(s):  
Shear Strength ◽  
Vegetation Cover ◽  
Sediment Type ◽  
Subsurface Structure

scholarly journals Correlation of VLF-EM Data with Radiometric Measurements: Implications for Uranium Exploration around Beldih, South Purulia Shear Zone, India

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Saurabh Mittal ◽  
S. P. Sharma ◽  
Arkoprovo Biswas ◽  
D. Sengupta
Keyword(s):  
Shear Zone ◽  
High Surface ◽  
Uranium Mineralization ◽  
Subsurface Structure ◽  
High Radiation ◽  
Background Radiations ◽  
Radiometric Measurements ◽  
Uranium Exploration ◽  
Radioactive Minerals ◽  
Open Cast

This study is an attempt to correlate VLF-EM data with the radiometric measurements to decipher the subsurface structure and to locate uranium mineralization in the shear zone. The study area is around Beldih mine which is an open cast apatite mine located on the South Purulia Shear Zone. VLF method has been applied to map the structure and the presence of radioactive minerals has been delineated by the detection of highαandγcounts with respect to the background radiations. High radiation counts and high surfaceγactivity are found just above the higher apparent current-density zones in all the profiles studied, at various locations, indicating uranium and/or thorium mineralization as well as good correlation between these techniques.

Structural interpretation using refraction velocities from marine seismic surveys

Geophysics ◽  
1986 ◽  
Vol 51 (1) ◽  
pp. 12-19 ◽  
Author(s):  
James F. Mitchell ◽  
Richard J. Bolander
Keyword(s):  
Sedimentary Rock ◽  
Seismic Energy ◽  
Seismic Survey ◽  
Subsurface Structure ◽  
Seismic Reflection Data ◽  
Near Surface ◽  
Reflection Data ◽  
Wide Range ◽  
Streamer Length ◽  
Set Up

Subsurface structure can be mapped using refraction information from marine multichannel seismic data. The method uses velocities and thicknesses of shallow sedimentary rock layers computed from refraction first arrivals recorded along the streamer. A two‐step exploration scheme is described which can be set up on a personal computer and used routinely in any office. It is straightforward and requires only a basic understanding of refraction principles. Two case histories from offshore Peru exploration demonstrate the scheme. The basic scheme is: step (1) shallow sedimentary rock velocities are computed and mapped over an area. Step (2) structure is interpreted from the contoured velocity patterns. Structural highs, for instance, exhibit relatively high velocities, “retained” by buried, compacted, sedimentary rocks that are uplifted to the near‐surface. This method requires that subsurface structure be relatively shallow because the refracted waves probe to depths of one hundred to over one thousand meters, depending upon the seismic energy source, streamer length, and the subsurface velocity distribution. With this one requirement met, we used the refraction method over a wide range of sedimentary rock velocities, water depths, and seismic survey types. The method is particularly valuable because it works well in areas with poor seismic reflection data.

Subsurface Structure Analysis of the Southern North Sea

Geotectonics ◽  
2021 ◽  
Author(s):  
M. A. F. Miraj ◽  
S. Shahzad ◽  
M. J. Munawar ◽  
N. Ahsan ◽  
R. F. Saleem ◽  
...  
Keyword(s):  
Structure Analysis ◽  
North Sea ◽  
Subsurface Structure ◽  
Southern North Sea
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