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A model for earthquake-induced translatory landslides in Quaternary sediments

1988; Geological Society of America; Volume: 100; Issue: 5 Linguagem: Inglês

10.1130/0016-7606(1988)100 2.3.co;2

1943-2674

Randall G. Updike, John A. Egan, Yoshiharu Moriwaki, I. M. Idriss, Thomas Moses,

Dam Engineering and Safety

Research Article| May 01, 1988 A model for earthquake-induced translatory landslides in Quaternary sediments R. G. UPDIKE; R. G. UPDIKE 1Alaska Geological and Geophysical Surveys, Eagle River, Alaska 99577 Search for other works by this author on: GSW Google Scholar J. A. EGAN; J. A. EGAN 2Geomatrix Consultants, San Francisco, California 94105 Search for other works by this author on: GSW Google Scholar YOSHIHARU MORIWAKI; YOSHIHARU MORIWAKI 3Woodward-Clyde Consultants, Santa Ana, California 92705 Search for other works by this author on: GSW Google Scholar I. M. IDRISS; I. M. IDRISS 3Woodward-Clyde Consultants, Santa Ana, California 92705 Search for other works by this author on: GSW Google Scholar T. L. MOSES T. L. MOSES 4Alaska Department of Transportation and Public Facilities, Anchorage, Alaska 99502 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1988) 100 (5): 783–792. https://doi.org/10.1130/0016-7606(1988)100 2.3.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation R. G. UPDIKE, J. A. EGAN, YOSHIHARU MORIWAKI, I. M. IDRISS, T. L. MOSES; A model for earthquake-induced translatory landslides in Quaternary sediments. GSA Bulletin 1988;; 100 (5): 783–792. doi: https://doi.org/10.1130/0016-7606(1988)100 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Anchorage Metropolitan area sustained catastrophic damage and loss of life during the 1964 Prince William Sound earth-quake (MW = 9.2). Current geologic and geo-physical data indicate that the area is subject to future major earthquakes related to the underlying subduction zone and possibly to nearby shallow faults. A major cause of destruction during the 1964 earthquake was ground failure. The cause of most of these failures has been directly linked to the Bootlegger Cove Formation, although there has been disagreement as to whether the failures were due to seismically induced liquefaction of sands or fabric collapse of sensitive silty clays. Our research has focused on one of these landslides and consisted of insitu geo-technical testing, undisturbed sampling, and laboratory testing of acquired samples. Based upon standard and electric-cone penetration tests, we conclude that the sand strata within the formation are non-liquefiable. Static and cyclic laboratory tests of the cohesive facies of the formation demonstrate that for peak horizontal accelerations above 0.2 g the shear strength of some facies decreases 25% to 30%. Further, we find that if the seismic loading continues on the order of a few minutes the strain-softened facies may undergo additional strength reduction to a residual shear strength ranging from 28% to 33% of the original undrained strength. This model for soil failure can be applied to all of the major Anchorage landslides, which we believe resulted from strength degradation of a cohesive silty clay facies under long-duration accelerations between 0.2 and 0.4 g. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.