A Caltech Library Service

Mechanics of the Lone Mountain landslides, San Francisco, California

Cogen, William M. (1936) Mechanics of the Lone Mountain landslides, San Francisco, California. California Journal of Mines and Geology, 32 (4). pp. 459-474. ISSN 0096-1558.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


This study was initiated for the purpose of determining the mechanics and causes of three landslides that had occurred on Lone Mountain. A careful survey was made of the geology at the slide localities. By means of graphical methods based on the principles of soil mechanics, the frictional resistance to sliding, which the ground exerted when motion impended, was determined. The inherent frictional properties of the ground were evaluated by laboratory experiments on samples of material obtained from the slide localities. Discordance between the graphical and the experimental values for the friction coefficients points to the presence of an agent which nullified, in part, the action of friction. The natural stability of the hillside on which the Parker Avenue slide occurred was reduced through a series of civic improvements which, in combination with the unfavorable geologic structure and the presence of water, ultimately caused tile landslide. The two smaller slides along Turk Street may be attributed to the hydro-dynamic action of water in the highly porous and unconsolidated sandy ground, with the consequent reduction of friction between the sand grains, and resultant liquefaction of the hillside mass.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemThesis
Additional Information:© 1936 California State Mining Bureau. The writer wishes to express his appreciation to John J. Casey, city engineer of San Francisco, for making available topographic survey data of the Parker Avenue slide.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Balch Graduate School of the Geological Sciences214
Issue or Number:4
Record Number:CaltechAUTHORS:20191113-074527652
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99819
Deposited By: Tony Diaz
Deposited On:13 Nov 2019 18:03
Last Modified:26 Feb 2020 23:58

Repository Staff Only: item control page