Seismicity is quantitatively computed. Generally the region under study is divided in equally sized areas defined by latitude and longitude and the interior of the Earth is divided into various depth intervals on account of Earth'slayering: Up to 50 km depth, 50–300 km, and > 300 km.[2]
The usual formula to calculate seismicity is:
where
: is the energy of a single seismic event (i.e., earthquake);