Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

Left dip

Dip of one limb from horizontal, in degrees.

Right dip

Dip of the opposing limb from horizontal, in degrees.

Interlimb angle in a profile-plane cross section with opposing limb dips measured from horizontal; classified after Fleuty as gentle, open, close, tight or isoclinal. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Interlimb angle

Angle between the two limbs in degrees: 180 minus the sum of dips.

Tightness

Fleuty tightness class from the interlimb angle.

• Apparent dip, thickness, fault, and fold geometry depend on coordinate convention, orientation measurements, map or section geometry, exposure, projection, and assumptions about planar or cylindrical structures. Ambiguous contacts require field or 3D validation.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Apparent Dip Calculator

  Apparent dip seen on a vertical section: tan(delta_apparent) = tan(delta_true) * cos(theta), where theta is the angle between the section and the dip direction.

• Earth Pressure At Rest Calculator

  At-rest lateral earth pressure for a normally consolidated soil via Jaky K0 = 1 - sin(phi): horizontal effective stress sigma_h' = K0 * sigma_v'. Stress in kPa, angle in degrees.

• Fault Heave Calculator

  Horizontal component of net dip slip on a fault plane: heave = dip slip * cos(dip).