Estimate PGA from magnitude and distance using attenuation relationship: log(PGA) = c₁ + c₂M − c₃ log(R) − c₄R.
| Constant | Symbol | Value |
|---|---|---|
| Speed of light | c | 2.99792458×10⁸ |
| Planck's constant | h | 6.62607015×10⁻³‴ |
| Boltzmann constant | kʙ | 1.380649×10⁻²³ |
| Avogadro's number | Nₐ | 6.02214076×10²³ |
| Gravitational constant | G | 6.6743×10⁻¹¹ |
| Gas constant | R | 8.31446 |
| Elementary charge | e | 1.602176634×10⁻¹⁹ |
| Electron mass | mₑ | 9.1093837015×10⁻³¹ |
| Proton mass | mₚ | 1.67262192369×10⁻²⁷ |
| Fine-structure constant | α | 7.2973525693×10⁻³ |
Estimate PGA from magnitude and distance using attenuation relationship: log(PGA) = c₁ + c₂M − c₃ log(R) − c₄R
Each component has a specific meaning:
Note: Interpret the peak ground accel. result against the clinical thresholds and context described above.
Enter the magnitude, distance for the patient or scenario you are assessing. Estimate PGA from magnitude and distance using attenuation relationship: log(PGA) = c₁ + c₂M − c₃ log(R) − c₄R. Use the peak ground accel. result to inform your clinical assessment.