earthquake: http://samjshah.com/2008/07/30/earthquakes-richter-scale-and-logarithms/

Saturday, July 2, 2011

Earthquakes Logarithms

This is how we get earthquake . There are two wave,first is compassional waves(called P-waves),second is shear waves(called S-waves)

The formula originally used by Richter is:

$M_L=\log_{10}(Amplitude)+(Distance Correction Factor)$
$M_L=\log_{10}(Amplitude)+3\log_{10}(8\Delta t)-2.92$
(Where $\Delta t$ is the S-P time interval.)
However,these formules are not 100 percent accurate ,It depends on different areas and stations.This is just a estimation based on varying data.

Nowadays,the earthquake is happening more and more frquently.Although human created some formulas to estimate it ,natural power is infinite.Do not destroy our earth any more!