A ShakeMap is a representation of the actual ground shaking produced by an earthquake.
The ShakeMap represents a combination of automatically recorded PGA values, in the accelerometer stations
around the epicenter of the earthquake, with the Ground Motion Prediction Equations (GMPE), for the places
where there are no stations around. This GMPE is specially developed for Groningen (v4).
Notes on ShakeMaps:
- Peak Ground Acceleration (PGA) values are in units of percent-g (%g, where g = 980.665 cm/s2).
- ShakeMap uses Maximum of horizontals, instead of Geometric Mean.
- The estimated ground motion values has been computed following the GMPE v4, combining 4 models (Lower, Central-lower, Central-upper and Upper) for the median predictions and 2 branches for the within-event variability (Phi).
- More details at: ShakeMaps Background
- A NetCDF grid file with the values of this ShakeMap can be downloaded from the KNMI Data Centre