scholarly journals Hierarchical zonation technique to extract common boundaries of a layered earth model

2007 ◽  
Author(s):  
Jayadev Acharya ◽  
Goparaju Sreechakra ◽  
Jaideva C. Goswami ◽  
Denis Heliot
Keyword(s):  
Earth Model ◽  
Layered Earth

Approximation to Cutoffs of Higher Modes of Rayleigh Waves for a Layered Earth Model

2009 ◽  
Vol 166 (3) ◽  
pp. 339-351 ◽  
Author(s):  
Yixian Xu ◽  
Jianghai Xia ◽  
Richard D. Miller
Keyword(s):  
Rayleigh Waves ◽  
Earth Model ◽  
Higher Modes ◽  
Layered Earth

Hole‐to‐surface resistivity measurements

Geophysics ◽  
1983 ◽  
Vol 48 (1) ◽  
pp. 87-97 ◽  
Author(s):  
Jeffrey J. Daniels
Keyword(s):  
Electric Field ◽  
Current Source ◽  
Surface Resistivity ◽  
General Nature ◽  
Earth Model ◽  
Geoelectric Section ◽  
Layered Earth ◽  
Resistivity Measurements ◽  
Surface Electric Field ◽  
Drill Holes

Hole‐to‐surface resistivity measurements over a layered volcanic tuff sequence illustrate procedures for gathering, reducing, and interpreting hole‐to‐surface resistivity data. The magnitude and direction of the total surface electric field resulting from a buried current source is calculated from orthogonal potential difference measurements for a grid of closely spaced stations. A contour map of these data provides a detailed map of the distribution of the electric field away from the drill hole. Resistivity anomalies can be enhanced by calculating the difference between apparent resistivities calculated from the total surface electric field and apparent resistivities for a layered earth model. Lateral discontinutities in the geoelectric section are verified by repeating the surface field measurments for current sources in several drill holes. A qualitative interpretation of the anomalous bodies within a layered earth can be made by using a three‐dimensional (3-D) resistivity model in a homogeneous half‐space. The general nature of resistive and conductive bodies causing anomalies away from the source drill holes is determined with the aid of data from several source holes, layered models, and 3-D models.

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