Use this seismology calculation to reproduce a stated convention, screen observations, or compare scenarios whose units, coordinate conventions, catalog selection, and model assumptions are known.

Phase

Required string. P or S.

The cited overview of Seismic wave supplies background for the terminology and domain context used by this tool.^[1]

Boore-Boatwright style average radiation factors for P and S waves over the focal sphere. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

⟨F⟩

Returned number. Average radiation factor.

Partition

Returned string. Component partition note.

• Earth structure, source geometry, path effects, site response, instrument response, catalog completeness, uncertainty, and the fitted range can dominate the accuracy of simplified seismic calculations.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

For analysis or hazard decisions, retain uncertainty and provenance and compare the result with waveform processing, calibrated regional models, and guidance from qualified seismologists or the responsible agency.

• Double Couple P T Axis Plunge Style Shortcut

  Shortcut P/T axis plunges for ideal focal styles (strike-slip, normal, reverse).

• Amplification Borcherdt Factor Lookup

  Borcherdt-style short-period amplification factor from NEHRP class.

• Average Moment Rate From Moment Duration Calculator

  Average seismic moment release rate over a specified source duration: Ṁ₀ = M₀/T.