Earthquake magnitude, energy release, and shaking intensity are all related measurements of an earthquake that are often confused with one another. This number is then used to calculate the energy that has been released. The Richter scale formula measures and records the movement of the Earth at the epicenter of an earthquake.

This is very similar to the elastic energy release values obtained above for an assumed maximum slip of 25 m, namely 7.9 × 10 18 and 1 × 10 19 J, depending on which energy formula is used. Note that ES is not the total "intrinsic'' energy of the earthquake, transferred from sources such as gravitational energy or to sinks such as heat energy. Their dependencies and relationships can be complicated, and even one of these concepts alone can be confusing. EARTHQUAKES The Richter Scale. It was prepared from the logarithm of amplitude of waves, that were recorded by seismographs. On the Richter scale, the magnitude of an earthquake … How much energy is involved largely depends on the magnitude of the quake: larger quakes release much, much more energy than smaller quakes. Assuming complete stress drop, the corresponding elastic energy release is, from Equation (25), 6.3–9.4 × 10 18 J. It is only the amount radiated from the earthquake as seismic waves, which, as was said above, is in most cases only a small fraction of the total energy transferred during the earthquake process. This formula was developed by Charles Richter, in the year 1935.

Here we'll look at each of these, as well as their interconnectedness and dependencies. In Italy, the energy that is released by an earthquake is often calculated using the “Mercalli scale” (actually it is a modified Mercalli-Cancani-Sieberg scale). The Richter magnitude scale was devised by Charles F. Richter in 1935 to classify local earthquakes in southern California, but has evolved into the most common parameter to describe the size of the quake and hence, its energy and potential of …