Seismicity

 ( Seismology Measurement ) 

Seismicity is a measure encompassing earthquake occurrences, mechanisms, and magnitude at a given Geography 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 Geophysics.

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Calculation of seismicity 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 Stratum: Up to depth, , and > .

The usual formula to calculate seismicity is:

$$S\; =\; \backslash frac\{\backslash sum\_\{i\}\; \{E\_\{s0\}\}\_i\}\{\; \backslash delta\; \backslash phi\_0\; \backslash ,\; \backslash delta\; \backslash lambda\_0\; \backslash ,\; \backslash delta\; h\_0\; \backslash ,\; \backslash delta\; t\_0\; \}$$

where

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

$\{\backslash delta\; \backslash phi\}\_0$: interval of latitude;

$\{\backslash delta\; \backslash lambda\}\_0$: interval of longitude

$\{\backslash delta\; h\}\_0$: interval of the hypocenter;

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

The result is seismicity as energy per cubic unit.

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See also

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

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