Soil‐pore Orientation and Faults

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Abstract
The orientation of soil pores was studied in order to assess the effect of faulting on soil pores. The results from soil samples collected adjacent to, in a fault zone, and at some distance from a fault were portrayed as rose diagrams and indicated the following: the shortest pores in all samples tend not to show any strongly developed orientation pattern; therefore, the long and midsized pores should be studied. Also, the orientation of these pores were similar in different samples of undisturbed soil from the same horizon, suggesting that the soil‐pore distribution can be characterized. Details of sample size for this characterization are also given. This work indicates that pore orientation can be used to further substantiate some megascopic observations and may be useful in documenting faulting histories, even where horizon displacement is lacking. However, in such cases, pore data will not yield unqualified conclusions.Pore orientation patterns may change very little with time.
Funding Information
  • U.S. Geological Survey
  • U.S. Department of the Interior

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