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Concept
Seismicity
Summary
Seismicity is a measure encompassing earthquake occurrences, mechanisms, and magnitude at a given geographical location. As such, it summarizes a region's seismic activity. The term was coined by Beno Gutenberg and Charles Francis Richter in 1941. Seismicity is studied by geophysicists.
Seismicity is quantitatively computed. Generally, the region under study is divided in equally sized areas defined by latitude and longitude, and the Earth's interior is divided into various depth intervals on account of Earth's layering: Up to depth, , and > .
The usual formula to calculate seismicity is:
where
is the energy of a single seismic event (i.e., earthquake);
interval of latitude;
interval of longitude
interval of the hypocenter;
interval of the time of the seismic event.
The result is seismicity as energy per cubic unit.
Official source
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