California’s most dangerous faults are not only defined by the headline grabbing magnitude 7 shocks that topple freeways and rupture gas lines. Deep below the surface, swarms of tiny earthquakes, some ...

Along the remote coast where the San Andreas Fault meets the Cascadia subduction zone, earthquakes too small for humans to feel are sketching out a hidden map of danger. By tracking these tiny tremors ...

Scientists uncover hidden faults beneath Northern California’s Mendocino triple junction. The discovery reshapes ...