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.

T

Required integer. Days in the reporting window.

D_out

Required integer. Days with no usable data.

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

Station uptime percentage from total and outage days. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

% (%)

Returned number in %. Uptime fraction in percent.

Meets 95%?

Returned boolean. Whether uptime reaches the common 95 percent target.

• 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.
• T must be at least 1.
• D_out 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.

• Network Detection Threshold Coverage Calculator

  Illustrative magnitude-of-completeness screening relation M_min ≈ 1.5 + log₁₀(r/km) using a detection radius of 1.5 times station spacing; it is not a calibrated network threshold.

• Azimuthal Hole Location Bias Warning Checker

  Warn when the station azimuthal gap is wide enough to push hypocentres systematically into the gap.

• Clock Drift PPM Linear Regression Calculator

  Least-squares drift rate in parts-per-million from timing offsets versus elapsed days.