Local governments in California have, since July, 1974, been facing the political reality that the general public no longer finds it acceptable to build structures across potentially active faults. The awareness stems from the new Alquist-Priolo Geologic Hazard Zones Act which states, in part, "the State Geologist shall delineate...special studies zones to encompass all potentially and recently active (fault) traces...". The definition of active fault has been defined by the State Geologist as a fault where surface displacement has occurred within Holocene Time. Many local governments have approached the solution from the classical "soil investigation" method of requiring each individual lot owner to obtain a certification for his own lot. On the other hand, a detailed study of many of the hazard zones is beyond the scope of most city budgets. Even more difficult to resolve has been the inability of the professional community to clearly define what geotechnical investigations are required for proper evaluation of a "fault hazard." One community decided to try an intermediate approach, namely to determine the technical rationale for the State's delineation of potentially active faults within the city's political boundaries and, through additional field studies and air photo interpretation, narrow the zone requiring detailed investigations. This paper presents a discussion of the techniques used in acquiring fault location data, analyzing the data and a novel approach in translating the results from technical to layman's language.

  • Supplemental Notes:
    • The Symposium held on April 2-4 1975 at Moscow, Idaho, was jointly sponsored by Idaho Transportation Department University of Idaho, Moscow; Idaho State University Pocatello; and Boise State University.
  • Corporate Authors:

    Idaho Department of Highways

    P.O Box 7129
    Boise, ID  United States  83707
  • Authors:
    • Donley, H F
    • Wire, J C
    • Rowland, R E
  • Publication Date: 1975-4

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00127656
  • Record Type: Publication
  • Created Date: Mar 10 1976 12:00AM