1) The following is a graph showing relationship between energy released (millions of tons of TNT equivalent) and Richter Magnitude:
I was told that each unit increase of the Richter Magnitude is a 31-fold in energy released, but why in the above graph, it is
not a 31-fold in energy released?
2) To determine the Richter Magnitude of an earthquake using a nomogram, you need to know the epicentral distance (from S-P lag time) and
amplitude of the largest wave recorded by the seismograph. This looks sloppy to me, does it mean the amplitude of S wave or the amplitude of Surface Wave? The surface waves actually procduce the largest amplitude...
Does anyone have any idea and would like to share?
