Thursday, March 4, 2010
One of the problems with the fits is that we may not be dealing with equilibrium distributions. Most of the smaller earthquakes in Southern California can be interpreted as aftershocks. The aftershocks follow Omori's Law and tend to persist for long times after a major earthquake slowly decreasing in magnitude. We cannot expect all the energy released by an earthquake to be dissipated as heat or dispersed as seismic waves. Some of it is redistributed in the area around the main shock and it takes a while before conditions return to normal. This may be a form of Nonequilibrium Thermodynamics.
Wednesday, March 3, 2010
The ratio, g, of number of earthquakes for successive intervals of the histogram shows some differences from that for the data for Southern California earthquakes. There is an initial dip which would indicate a lower slope and a "plateau" at M 2.0 which corresponds to higher numbers in the histogram. The slope of the curve at higher magnitude is not quite as linear as was the case for Southern California. Also note the simpler form used for g above. It didn't affect the fit at all and one can easily convert between the two forms. The orignal formula was a modified version of the diode equation.
Monday, March 1, 2010
The victims of an earthquake take the blunt of what happens but in a disaster of such magnitude they need the help of their neighbors, the country as a whole and the international community. If we can't prevent earthquakes from happening we need to have assistance programs in place and the means to get aid to those in need. Here are some efforts in place:
International Strategy for Disaster Reduction
Global Platform for Disaster Risk Reduction
Pan American Health Organization