It comes from the trenches we put across the faults to look at the time of past earthquakes. It comes from satellite-based measurements ... that tell us how fast the plates are moving.  -   David Schwartz     Quotes
It comes from the trenches we put across the faults to look at the time of past earthquakes. It comes from satellite-based measurements ... that tell us how fast the plates are moving. David Schwartz
 Faults