USGS-landslides.20060403T190431 gwieczor@usgs.gov 20060403T190431.000Z Actual Alert Public en-US Geo Landslide alert for San Francisco Bay Area, California Expected Moderate Likely gwieczor@usgs.gov USGS issues Landslide Alert for San Francisco Bay Area, California Recent, almost continuous rainfall has soaked hillsides in the San Francisco Bay area making them highly susceptible to landslides. Large slow-moving landslides have already recently occurred in San Mateo and Marin Counties. Rain is expected to continue throughout this week and more slow moving landslides are expected to initiate and start moving during the next several weeks even after the rain stops. Parts of the Bay Area particularly prone to landslides include the areas in or near the Santa Cruz Mountains, Mount Tamalpais and the East Bay hills. Such landslides can occur on hillsides that slope as little as 5-8 degrees. Heavy rainfall, perhaps 5 inches in 24 hours, could also trigger rapidly moving debris flows from steep slopes. See instructions at http://landslides.usgs.gov/learningeducation/hazards.php http://landslides.usgs.gov/learningeducation/docs/sfbayfs97.pdf Gerald Wieczorek Marin, Napa, Alameda, Contra Costa, Santa Cruz, San Mateo, Sonoma, Solano, and Santa Clara counties, and San Francisco City and County, California