PGV PGA Correlation Approximation Calculator
Approximate PGV from PGA by treating the motion as a sinusoid with effective period T_ref: PGV ≈ PGA·T_ref/(2π); this is a kinematic estimate, not an empirical ground-motion conversion.
Description
Approximate PGV from PGA by treating the motion as a sinusoid with effective period T_ref: PGV ≈ PGA·T_ref/(2π); this is a kinematic estimate, not an empirical ground-motion conversion.
PGV PGA Correlation Approximation Calculator is a focused tool for the following task. Approximate PGV from PGA by treating the motion as a sinusoid with effective period T_ref: PGV ≈ PGA·T_ref/(2π); this is a kinematic estimate, not an empirical ground-motion conversion. It reports PGV from the values you provide rather than inventing measurements, coefficients, or professional judgment that are not part of the input.
When to use PGV PGA Correlation Approximation
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.
- PGA (cm/s²)
- Required number in cm/s². Peak ground acceleration.
- T_ref (s)
- Optional number in s. Effective correlation period.
The cited overview of Seismology supplies background for the terminology and domain context used by this tool.1
How PGV PGA Correlation Approximation works
Approximate PGV from PGA by treating the motion as a sinusoid with effective period T_ref: PGV ≈ PGA·T_ref/(2π); this is a kinematic estimate, not an empirical ground-motion conversion. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.
- PGV (cm/s)
- Returned number in cm/s. Estimated peak ground velocity.
Limitations and assumptions
- 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.
- PGA must be at least 0.
- Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.
Alternative or Complementary approaches
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.
References
-
Seismology — Wikipedia contributors
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