The Puente Hills fault system is back in focus after a 4.4-magnitude earthquake near Highland Park. It is one of several similar faults in the Los Angeles Basin.

By contrast, an earthquake on the Puente Hills thrust fault system probably would max out at a magnitude 7.5 — still powerful, but less so than the southern San Andreas.

A 4.4 magnitude earthquake in Los Angeles in August was along the Puente Hills fault system, a thrust fault that runs beneath one of the city's oldest and most densely populated areas.

The 4.4 magnitude earthquake that was felt in many Southern California cities Monday fell on the Puente Hills Thrust Fault System, which is potentially the most destructive in the region.

A recent 4.4-magnitude earthquake that rattled Los Angeles is raising concern over the lesser-known Puente Hills fault system, which seismologists say has the potential to unleash a devastating quake.

A 4.4 magnitude earthquake in Los Angeles in August was along the Puente Hills fault system, a thrust fault that runs beneath one of the city's oldest and most densely populated areas.

This 25-mile-long fault runs from the Glendale/Pasadena area to Puente Hills and has been extremely active in recent months. The same fault was the site of a magnitude 3.4 quake on June 2 and a ...

The Puente Hills thrust fault. This fault system is buried and doesn’t rise up to the Earth’s surface, Jones explains, and it is covered by the hills that have grown on top of it. It spans across some ...

By contrast, an earthquake on the Puente Hills thrust fault system probably would max out at a magnitude 7.5 — still powerful, but less so than the southern San Andreas.

A 4.4 magnitude earthquake in Los Angeles in August was along the Puente Hills fault system, a thrust fault that runs beneath one of the city’s oldest and most densely populated areas.