Monday’s magnitude 4.4 quake that rattled Southern California is believed to have struck on a well-known and dangerous fault system known as the Puente Hills thrust fault system.

Therefore, while the San Andreas fault may generate more powerful earthquakes—up to magnitudes of around 8.0 or even higher—the location of the Puente Hills thrust fault makes it a major hazard.

Millions of people are directly on top of the Puente Hills Thrust Fault where this week’s earthquake fell. Alex Rozier reports for the NBC4 News at 4 p.m. on Tuesday, August 13, 2024.

Findings from a recently published paper led by Smithsonian senior scientist emeritus Thomas R. Watters reveal evidence that the south polar region of Earth’s moon has experienced the effects of the ...

The Foothill Thrust Belt faults are deep under Silicon Valley, and researchers at Stanford found they’re capable of generating a magnitude 6.9 earthquake every 250 to 300 years.

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.