creating an alluvial fan — one of the most visually compelling and dynamic features of geology. In the case of the San Gabriel Mountains, debris flows are a scenario that’s been explored many ...

California has relatively young mountains from a geology standpoint ... rain over fire-scarred mountains unleashed a debris flow that killed 16 people who had gathered at a church facility ...

Rain on burned hillslopes can trigger dangerous floods and debris flows. Those debris flows can move with the speed of a freight train, picking up or destroying anything in their path. They can move ...

Storms now pounding Southern California are raising the specter of more danger for residents—debris flows in areas already reeling from devastating fires. Debris flows are like mudslides ...

As an intense storm moved through Southern California, a debris flow sent mud down Mulholland Drive in Hollywood Hills -- leading to a full closure of the roadway Thursday evening, authorities said.

Though wildfires around Los Angeles are contained, foothill communities remain at risk of debris flows. Heavy rain could trigger dangerous mudslides in burn areas like Altadena and Pasadena.