LANDSLIDES

Landslide processes are discussed, and comments are made on the analysis of slope stability and landslide distribution. The report concludes the evaluation of the landslide problem on a regional scale requires more generalized data and permits less specific conclusions than evaluation of the problem at specific sites. The relative slope-stability map of the San Francisco Bay region compiled at a scale of 1:125000 delineates areas according to five categories of estimated relative slope stability. A preliminary map is presented which represents an initial attempt at analyzing the landslide problem of the entire region on a scale useful for land use planning. The map indicates the stability of areas on the basis of landslide distribution, slope, and bedrock geology. It is shown that the least stable areas are in the steeply sloping mountainous terrain underlain by serpentine-rich rocks of the Franciscan Sequence adjacent to Mount Diablo. Sedimentary strata in the southeastern part of the map area have bariable relative slope stability. Unconsolidated Bay muds, although in areas of low slope, are subject to liquefaction and lateral spreading and are placed in a separate category.

• Corporate Authors:

  U.S. Geological Survey

  12201 Sunrise Valley Drive
  Reston, VA  United States  20192
• Authors:
  • Nilsen, T H
• Publication Date: 1977-4

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 26-33
• Serial:
  • Earthquake Information Bulletin
  • Volume: 9
  • Issue Number: 2

Subject/Index Terms

• TRT Terms: Bedrock; Geology; Land use planning; Landslides; Liquefaction; Maps; Mud; Sedimentary rocks; Slope stability; Unconsolidated soils
• Old TRIS Terms: Liquefaction (Soil)
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00163567
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 14 1978 12:00AM