With the most powerful rainstorm of the season set to soak Southern California on Thursday, the first assessment of mudslide danger since the January firestorms shows that both the Pacific ...

Throughout Southern California, the bases of mountain ranges are strewn with the effluent of past debris flows — called alluvial fans — and cities in the sprawling Los Angeles basin have been ...

Throughout Southern California, the bases of mountain ranges are strewn with the effluent of past debris flows — called alluvial fans — and cities in the sprawling Los Angeles basin have been ...

Mudslides are dangerous torrents that are usually referred to by geologists and first responders as debris flows. They have been particularly lethal in parts of California where landscape, climate ...

This is what a small debris flow looks like. A swelling torrent of mud and boulders descends a small canyon over the Las Lomas debris basin in Duarte, Calif., which is located just a few ...

Often located at the mouths of canyons, the basins collect debris while allowing water to ... to be replenished by collecting sediment that flows out of the canyons, according to experts.