The Whittier Fault is a geologic fault located in eastern Los Angeles County in Southern California, that is one of the two upper branches of the Elsinore Fault Zone, with the Chino Fault the second.
The Whittier Fault is a 40-kilometer (25 mi) right-lateral strike-slip fault that runs along the Chino Hills range between the cities of Chino Hills and Whittier. The fault has a slip rate of 2.5 to 3.0 millimeters (0.098 to 0.118 in) per year. It is estimated that this fault could generate a quake of MW6.0–7.2 on the moment magnitude scale.