How QuakeViewer3D calculates estimated local seismic intensity and Peak Ground Acceleration (PGA) in real-time from raw USGS earthquake parameters.
1. Ground Motion Prediction Equations (GMPE)
Estimating Peak Ground Velocity (PGV) and Acceleration (PGA) on engineering bedrock using empirical attenuation formulas.
2. Surface Soil Amplification Factors (AVS30)
Correcting ground motions based on average shear-wave velocities in the top 30 meters of soil.
3. Bi-Directional JMA Shindo & MMI Mapping
Seamlessly mapping computed ground accelerations to Japan's 10-tier Shindo scale and the global Modified Mercalli Intensity (MMI) scale.