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.

n_z

Required integer. Number of zeros.

n_p

Required integer. Number of poles.

A₀

Required number. Normalization constant.

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

Validate an analog response stage: pole/zero counts and normalization sanity. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Consistent?

Returned boolean. Whether the stage definition is plausible.

Issues

Returned list. Names of failed checks.

• 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.
• n_z must be at least 0.
• n_p must be at least 0.
• A₀ must be at least 0.
• 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.

• Event Count Poisson Confidence Interval Gehrels Approximation

  Gehrels (1986) algebraic approximations to the 84.13% one-sided Poisson limits (the conventional asymmetric one-sigma error bars), including the tabulated 1.841 upper limit for zero counts.

• ADC Clip Level Full Scale Counts Calculator

  Digitizer LSB size and clip voltage from bit depth and full-scale range.

• Coda Normalization Lapse Time Amplitude Correction

  Correct coda amplitudes to a reference lapse time using the spreading law A ∝ t^−α.