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Seismicity is a measure encompassingearthquake occurrences, mechanisms, andmagnitude at a givengeographical location.^[1] As such, it summarizes a region's seismic activity. The term was coined byBeno Gutenberg andCharles Francis Richter in 1941. Seismicity is studied bygeophysicists.

Seismicity is quantitatively computed. Generally, the region under study is divided in equally sized areas defined bylatitude andlongitude, and theEarth's interior is divided into various depth intervals on account ofEarth'slayering: Up to 50 km (31 mi) depth, 50–300 km (31–186 mi), and > 300 km (190 mi).^[2]

The usual formula to calculate seismicity is:

$${\displaystyle S=\frac{\sum _i{E_{s0}}_i}{\delta {\varphi }_0\delta {\lambda }_0\delta h_0\delta t_0}}$$

where

${\displaystyle {E_{s0}}_i}$: is the energy of a single seismic event (i.e., earthquake);

${\displaystyle {\delta \varphi }_0}$: interval oflatitude;

${\displaystyle {\delta \lambda }_0}$: interval oflongitude

${\displaystyle {\delta h}_0}$: interval of thehypocenter;

${\displaystyle {\delta t}_0}$: interval of the time of the seismic event.

The result is seismicity as energy per cubic unit.

• Moment magnitude scale
• Plate tectonics
• Seismology
• Wadati–Benioff zone

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