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Yosemite, Ahwiyah Point rockfall by yosemite

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About This Gigapan

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Taken by
yosemite yosemite
Explore score
8
Size
0.26 Gigapixels
Views
4622
Date added
Apr 07, 2009
Date taken
Apr 06, 2009
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Description

A very large rock fall occurred from Ahwiyah Point near Half Dome at 5:26 am on the morning of March 28. The rock fall originated near the summit of Ahwiyah Point and fell roughly 1800 feet to the floor of Tenaya Canyon, striking ledges along the way. Debris extended well out into Tenaya Canyon, knocking down hundreds of trees and burying the southern portion of the Mirror Lake loop trail. Reminiscent of the 1996 Happy Isles rock fall, there appears to have been a small airblast associated with impact on the valley floor. Fortunately, due to the event occurring in the early morning, there were no injuries. The impact generated ground shaking that was recorded by numerous seismometers across California, registering as the equivalent of a local magnitude 2.5 earthquake:

quake.wr.usgs.gov/recenteqs/Quakes/nc40233925.htm Will open in a new tab or windowThe volume of the Ahwiyah Point rock fall is still being determined, but it was clearly one of the largest rock falls in the past decade; for perspective this rock fall was many times the size of the recent October 2008 rock falls behind Curry Village. Numerous smaller rock falls have occurred from Ahwiyah Point since the initial failure, and the southern portion of the Mirror Lake loop trail remains closed until further notice.


Gigapan Comments (2)

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  1. Randy Sargent

    Randy Sargent (November 12, 2009, 05:36AM )

    A view from before rockfall: gigapan.org/gigapans/14657/snapshot s/108366/

  2. Val Zimmer

    Val Zimmer (April 08, 2009, 05:04PM )

    Very nice, thank you.

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