Mass wasting, the downslope movement of rock and soil under gravity, shapes landscapes but can also threaten lives and infrastructure. From slow soil creep to sudden rockfalls, these events are ...

In October and November 2007, an unprecedented series of wildfires struck the entire southern half of California, and once again thousands of homes were either in flames or threatened by them, with ...

After a wildfire, the danger continues, especially during torrential rain that can set off fast-moving landslides known as debris flows. By Amy Graff Amy Graff is a San Francisco-based reporter on The ...