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.

Rise (m)

Vertical component of shelf-edge migration in metres (positive up, negative down).

Run (m)

Horizontal progradation distance of the shelf edge in metres.

Shelf-edge trajectory angle from vertical rise and horizontal run of shelf-edge migration: atan2(rise, run). Positive angles are aggradational, negative retrogradational. 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]

Trajectory

Shelf-edge trajectory angle in degrees from horizontal (-90 to +90).

• Stratal terminations and systems tracts are interpretations sensitive to seismic resolution, datum, compaction, subsidence, sediment supply, chronology, and depositional model. A geometric angle or thickness alone does not identify sequence boundaries.
• 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.

• Seismic Migration Aperture Calculator

  Horizontal migration aperture for a dipping reflector: z tan(dip) per side (and twice that for the full aperture), with reflector depth z in meters and dip angle in degrees.

• 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.