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.

Distance

Path length in kilometers.

Vp

P-wave velocity in kilometers per second.

Straight-ray P-wave first-arrival time t = d / vP with distance and velocity in kilometers and kilometers per second. 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]

Travel time

P-wave travel time in seconds.

• Seismic magnitudes, moments, travel times, velocities, resolution, and energy depend on instrument correction, Earth model, phase picking, geometry, attenuation, radiation pattern, bandwidth, and calibration range. Magnitude scales are not universally interchangeable.
• 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.

• Travel Time S Wave Calculator

  Straight-ray S-wave arrival time t = d / vS with distance and velocity in kilometers and kilometers per second.

• S-P Interval To Distance Calculator

  Epicentral distance from the S-minus-P arrival-time interval: d = dt * (vP * vS) / (vP - vS) for a common straight-ray path.

• Seismic Acoustic Impedance Calculator

  Acoustic impedance Z = rho Vp from P-wave velocity in meters per second and bulk density in kilograms per cubic meter, returned in pascal seconds per meter.