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.

r_i

Required list. Station residuals.

k

Optional number. Outlier threshold in sigmas.

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

Flag stations whose travel-time residuals exceed k standard deviations of the set. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

idx

Returned list. Zero-based indices of outliers.

σ (s)

Returned number in s. Sample standard deviation.

• 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.

• Wadati Residual Histogram Binner

  Bin station Wadati residuals into a fixed-width histogram with outlier tail capture.

• RMS Travel Time Residual Quality Calculator

  Root-mean-square travel-time residual and qualitative location quality.

• AGC Gain Step Artifact Flagger

  Flag windows where automatic-gain-control steps coincide with event energy.