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AUGUST 2018 | VOLUME 28, NUMBER 8 Cover: Rockfall scar and runout path from rockfalls on the southeast
face of El Capitan, Yosemite Valley, USA, which occurred on 27–28
GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news Sept. 2017. As determined from combined terrestrial lidar and “struc-
and information for more than 26,000 GSA member readers ture-from-motion” photogrammetry analysis, the scar resulting from
and subscribing libraries, with 11 monthly issues (March/ the largest rockfall was 120 m tall, 45 m wide, and up to 8 m thick, with
April is a combined issue). GSA TODAY is published by The a total volume of 10,241.2 ± 476.2 m3. Rapid 3-D rockfall analysis
Geological Society of America® Inc. (GSA) with offices at informed National Park Service decisions to protect public safety. Photo
3300 Penrose Place, Boulder, Colorado, USA, and a mail- by Greg Stock/National Park Service. See related article, p. 28–29.
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Cover inset photo: Horn coral. Photo by Stephen Greb.