Ultradeep melting rocks drive invisible quake beneath the San Andreas Fault

Together San andreas fault Near the city of Parkfield, California, an incredibly sensitive array of seismic and GPS devices have been detecting something strange for years: Earthquake It comes down when California has the most seismic movement.

These earthquakes cannot be felt on the surface, but they are tricky because this section of San Andreas near the city of Parkfield also shines with magnitude-6 or earthquakes every 20 or 40 years – damaging buildings. Strong enough to pose a threat to nearby people. And these deep shocks can be associated with surface templars.