Earthquakes have long been recognized as resulting from a stick-slip f
rictional instability. The development of a full constitutive raw for
rock friction now shows that the gamut of earthquake phenomena-seismog
enesis and seismic coupling, pre-and post-seismic phenomena, and the i
nsensitivity of earthquakes to stress transients-all appear as manifes
tations of the richness of this friction law.