GSA Today
Volume 28

Cover image

About the cover:
Rockfall scar and runout path from rockfalls on the southeast face of El Capitan, Yosemite Valley, USA, which occurred on 27–28 Sept. 2018. As determined from combined terrestrial lidar and “structure-from-motion” photogrammetry analysis, the scar resulting from the largest rockfall was 120 m tall, 45 m wide, and up to 8 m thick, with a total volume of 10,241.2 ± 476.2 m3. Rapid 3-D rockfall analysis informed National Park Service decisions to protect public safety. Photo by Greg Stock/National Park Service.

doi: 10.1130/GSATG374GW.1

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