In 2013 there were 34 rockfalls in the park. The average since 2006 is 55 per year. A total of over 4,000 tons fell. A car weighs about 2 tons. (Same as the blocks on the Pyramids.) 35% of rockfalls since 1857 were related to rain/snow. Since we’ve been light there, the numbers are low.
As far as major-ish rockfalls are concerned, one went on May 11 when about 950 tons fell from the top of the Panorama Cliff and landed on the John Muir Trail below Clark’s Point. Switchbacks were closed but nothing really big. I hiked it after it was open and there was a lot of rubble.
The second biggest of the year was on October 5 when 2200 tons fell off Ahwiyah Point north of Half Dome; this was the largest rockfall of 2013. The same place had a huge rockfall in 2009 and has had intermittent activity since then. The Mirror Lake Loop trail was closed in 2009 and 2013. There were no injuries in either case.
Middle and Higher Cathedral Rocks, the Porcelain Wall west of Half Dome, Glacier Point, Royal Arches, and El Capitan all had rockfalls.
I’m telling you – wear a DOT helmet!!
Unrelated thought worth quoting: “I’m allergic to rocks hitting me in the face.”
― Mike Rowe
MrHalfDome™ – Rick Deutsch – www.HikeHalfDome.com