South of Parkfield, the fault is locked, meaning the two plates do not move against one another. North of Parkfield, the San Andreas fault moves freely, with the plates creeping against one ...

The San Andreas Fault line, which stretches some 800 miles across California, marks the boundary between the Pacific and ...

New research uncovers a surprising clue in earthquake forecasting: tiny curved scratches on fault planes. These marks reveal ...

A popular spot in America for tourists is also a hotspot for earthquakes with a number of projects underway to future-proof ...

Experts say portions of the continent are pulling apart, creating the possibility that the Horn of Africa will become an island.

Rather, two plates move against each other, building up tension, then releasing the tension in a sudden and often violent jerk. This sudden jerk creates an earthquake. The San Andreas Fault is ...

A mid-ocean ridge would then mark the boundary between the plates. Mountains and a rift can be seen along the San Andreas Fault.

Movement along the San Andreas Fault was to blame. The North American and Pacific tectonic plates had moved past each other by more than 15 feet — compared to an annual average of two inches.

If the plates move a significant distance very ... An example of this type of boundary is the San Andreas fault, California.