If one introduces the concept of energy of an earthquake then that is a theoretically derived quantity.

It is a common remark that men talk most who think least; just as frogs cease their quacking when a light is brought to the water-side.

I would walk - not run - to the nearest seismograph.

As seismologists gained more experience from earthquake records, it became obvious that the problem could not be reduced to a single peak acceleration. In fact, a full frequency of vibrations occurs.

The rose does not bloom without thorns. True, but would that the thorns did not outlive the rose.

In every area of the world where there is earthquake risk, there are still many buildings of this type; it is very frustrating to try to get rid of them.

Only fools, liars, and charlatans predict earthquakes