200-Foot Section of Cliff Collapses Into Lake Superior
Colorado Hiker Captures Rockslide in Rocky Mountain National Park
Climber Narrowly Avoids Major Rockfall
'Sounded Like Thunder': Hiking Trail Closed After Rockslide in Zion National Park
Dust Rises in Sierra Nevada After Earthquake Hits California
'Thunderous' Rockfall Closes Roads and Trails in Yosemite National Park
Rockfalls and Damage to Buildings After M5.7 Quake Rocks Puerto Rico
Hikers Watch Rockfall in Sawtooth Mountains During Idaho Earthquake