No joy in nature is so sublimely affecting as the joy of a mother at the good fortune of a child.

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.

Spring makes everything young again except man.

I was lucky because logarithmic plots are a device of the devil.

Lately there have been complaints that the use of the magnitude scale is confusing, or at least the reporting of magnitudes in the newspapers 'confuses the public.

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

According to Democritus, truth lies at the bottom of a well, the water of which serves as a mirror in which objects may be reflected. I have heard, however, that some philosophers, in seeking for truth, to pay homage to her, have seen their own image and adored it instead.