# How does the Richter scale and a seismograph fit together?

Sep 07, 2010
in
Earthquake Questions

what does a seismograph have to do with the Richter scale?

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3 comments

Gary Y on September 7, 2010 at 12:53 am

The Richter Scale assigns a number to quantify the seismic energy released during an earthquake as recorded by the seismograph. https://en.wikipedia.org/wiki/Richter_Scale

A.Ganapathy India on September 7, 2010 at 12:53 am

The seismograph records the fallowing parameters.

1. The arrival time of P,S,L,& R waves.

2. The amplitude of each wave,

3.The frequency of the wave.

By multiplying the speed difference of P wave and S wave we get the distance of epicenter but not the location. The distance of epicenter to gether with the maximum amplitude recorded is used to calculate the Richter scale. As the distance of seismograph increases the maximum amplitude recorded will get reduced by inverse square of distance. The formula for arriving the Richterscale magnitude is little bit complicated.There are several formula for differenttype of Richter scale .There are some measurement like Mb,Mw,Ms,Ml.

Michael on April 26, 2011 at 3:38 am

Thanks A. Ganapathy, I’d been looking for that for a long time!!!