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Geotechnical
Investigation of a Large Landslide in Somis, California During the El Nino wet winter of 1998, a large deep-seated bedding plane landslide occurred in the Somis area of Ventura County, California. The landslide was approximately 740 feet long and 370 feet wide and occurred in the Pliocene-age Pico Formation. The elevation difference between the top and toe of the slide was approximately 210 feet.
Antenna sites and an access road were significantly displaced. Movement of portions of the slide ranged from approximately 33 feet to 70 feet. If the slide was not stabilized, additional movement could have affected other antenna sites and a building near the toe of the slide.
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