New research indicates that a tsunami as high as 8 m (26 feet) may have struck on Lake Geneva in the year 563 A.D. A large rockfall at the East end of the lake near the Rhone Delta is thought to be the source of the tsunami that traveled up to 70 km away. Dr. Dave at the Landslide Blog evaluates the paper in more detail. [Source: The Landslide Blog. Image: Kremer et al. (2012) via The Landslide Blog]
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US 89 Bitter Springs Landslide Video Updates
Since I last posted about this landslide, ADOT has added several videos to their YouTube channel. It’s clear that this highway is going to be closed for the long term. ADOT and their on-call geotechnical consultant tasked with this project, Kleinfelder, are currently drilling boreholes to attempt to characterize the failure surface and determine what the geometry of the failure surface is. They are installing at least 10 inclinometers to try to determine the location of the slip plane or planes at depth and they have two extensometers to measure if any additional movement occurs. They are also performing LIDAR surveys as well. Check out the videos below.
Initial ADOT Video Describing the Failure
Click through for the videos!
Video: Emergency Response to Nile Valley Landslide, WA SR 410
May 25, 2010
rockman
Geologic Hazards
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