Basin Edge Surface Waves Checker
Screen whether the bedrock-to-basin shear-wave velocity contrast reaches an illustrative 2:1 threshold associated with stronger basin-edge effects; geometry is not modeled.
Description
Screen whether the bedrock-to-basin shear-wave velocity contrast reaches an illustrative 2:1 threshold associated with stronger basin-edge effects; geometry is not modeled.
Basin Edge Surface Waves Checker is a focused tool for the following task. Screen whether the bedrock-to-basin shear-wave velocity contrast reaches an illustrative 2:1 threshold associated with stronger basin-edge effects; geometry is not modeled. It reports Vr/Vb, Likely from the values you provide rather than inventing measurements, coefficients, or professional judgment that are not part of the input.
When to use Basin Edge Surface Waves Checker
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.
- Vs,basin (m/s)
- Required number in m/s. Basin fill shear velocity.
- Vs,rock (m/s)
- Required number in m/s. Bedrock shear velocity.
The cited overview of Seismic wave supplies background for the terminology and domain context used by this tool.1
How Basin Edge Surface Waves Checker works
Screen whether the bedrock-to-basin shear-wave velocity contrast reaches an illustrative 2:1 threshold associated with stronger basin-edge effects; geometry is not modeled. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.
- Vr/Vb
- Returned number. Bedrock-to-basin velocity contrast.
- Likely
- Returned boolean. Whether edge-generated surface waves are expected.
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.
- Vs,basin must be at least 0.
- Vs,rock 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
-
Seismic wave — Wikipedia contributors
Similar or alternative tools
- Source Rise Time Dislocation Calculator
Characteristic source timescale estimated as fault width divided by shear-wave velocity; this is a dimensional proxy, not a fitted rupture rise-time model.
- Air Coupled Rayleigh Wave Speed Calculator
Rayleigh wave speed from shear velocity (≈0.92·β for ν = 0.25) compared with the speed of sound in air.
- Love vs Rayleigh Motion Classifier
Screen surface-wave component amplitudes for Love-like SH dominance or Rayleigh-like P-SV dominance. Amplitudes alone cannot determine ellipticity or retrograde phase motion.