No injuries were reported. The previous earthquakes were just minutes apart from each other and measured magnitudes of 3.2 and 3.3 in the same area, along the Hayward fault.

The temblor followed three earlier small earthquakes — a magnitude 2.7 that struck near the Hayward fault at 5:03 a.m., followed by a magnitude 3.3 at 11:52 a.m., then a 3.2 at 11:54 a.m. The ...

They found that the Hayward fault crept a tiny fraction of an inch ... Fault and is considered part of the Cascadia subduction zone that extends farther north along the coast.

Aftershocks are typically minor adjustments along the portion of a fault that slipped at the time of the initial earthquake. The quakes happened on the Hayward Fault, one of a handful of major ...