PIEDMONT -- Mother Nature delivered an early morning wake-up call to the East Bay Saturday as a 3.2 magnitude earthquake -- centered in Piedmont -- jolted many residents from their sleep.

There were no reports of damage from the 4.25 a.m. quake that occurred on the Hayward Fault. That fault zone is among the most dangerous in the Bay Area because it runs though Hayward, Oakland and the Berkeley Hills.

The shallow point of the quake -- just 3.7 miles below the surface -- was the reason the quake was felt throughout the Bay Area.