Four earthquakes, measuring up to nearly three on the Richter scale, were recorded within two hours of each other near Concrete on Monday morning. All four earthquakes were recorded approximately four ...

Add Yahoo as a preferred source to see more of our stories on Google. Tiny quakes help scientists map hidden faults where the San Andreas meets Cascadia, reshaping quake hazard estimates. (CREDIT: ...

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 at Stanford have unveiled the first-ever global map of rare earthquakes that rumble deep within Earth’s mantle rather than its crust. Long debated and notoriously difficult to confirm, ...

Northern California’s coast keeps you on alert, even on quiet days. Offshore, three tectonic plates meet near Humboldt County at the Mendocino Triple Junction. It is where the San Andreas fault system ...