2 major West Coast fault lines could be in sync and trigger double earthquake, scientists say
The San Andreas Fault and the Cascadia Subduction Zone can trigger each other within hours, increasing risk of sequential major earthquakes along the West Coast.
San Andreas, Cascadia faults could combine to produce back-to-back earthquake disasters, new research suggests
Large Cascadia megathrust earthquakes historically triggered large northern San Andreas fault earthquakes within hours to days, producing devastating back-to-back events.