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Showing posts from May 30, 2021

The significance of apparent dip in geological cross-sections

  The significance of apparent dip in geological cross-sections Geologists use strike and dip measurements to generate realistic geologic maps and cross-sections by determining the attitude of rock strata or other planar geologic features. Data on rock attitudes, for example, aids in the identification of fold structures in layered rocks. Any dip measured in a vertical plane that is not perpendicular to the strike line is referred to as an apparent dip. If you know the strike, you can calculate the true dip from the apparent dip using trigonometry. When geologic cross sections are produced at an angle that is not perpendicular to the strike, the apparent dip is used. The apparent dip is determined by the angle formed by the cross-section and strike. If this angle is 90 degrees (perpendicular), the dip is true. The apparent dip will be shorter than the true dip if the angle between the strike line and the cross-section line is less than 90 degrees.  A: The plane is seen in a cross-secti