A Caltech Library Service

Displacement on the San Andreas fault subsequent to the 1966 Parkfield earthquake

Smith, Stewart W. and Wyss, Max (1968) Displacement on the San Andreas fault subsequent to the 1966 Parkfield earthquake. Bulletin of the Seismological Society of America, 58 (6). pp. 1955-1973. ISSN 0037-1106.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Immediately following the 1966 Parkfield earthquake a continuing program of fault displacement measurements was undertaken, and several types of instruments were installed in the fault zone to monitor ground motion. In the year subsequent to the earthquake a maximum of at least 20 cm of displacement occurred on a 30 km section of the San Andreas fault, which far exceeded the surficial displacement at the time of the earthquake. The rate of displacement decreased logarithmically during this period in a manner similar to that of the decrease in aftershock activity. After the initial high rate of activity it could be seen that most of the displacement was occurring in 4–6 day epochs of rapid creep following local aftershocks. The variation of fault displacement along the surface trace was measured and shown to be consistent with a vertidal fault surface 44 km long and 14 km deep, along which a shear stress of 2.4 bars was relieved.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:Copyright © 1969, by the Seismological Society of America. Manuscript received March 26, 1968. Some of the instrumental recordings of movement of an active fault presented in this paper are unique, and would have been impossible to obtain had it not been for the rapid and efficient installation of instruments immediately following the earthquake. Special thanks are due to W. Gile, R. Gilman, and D. Tanner for making this possible. The continued interest and assistance of R. Carr on whose property the instruments were located, was invaluable. The authors profited from discussions with J. Brune, and from the critical review of the manuscript provided by C. R. Allen. This work was supported by the National Science Foundation grant GP 2806 (Upper Mantle Proieet) and National Science Foundation grant GA 1087 (Earthquake Mechanisms).
Funding AgencyGrant Number
NSFGP 2806
NSFGA 1087
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences1527
Issue or Number:6
Record Number:CaltechAUTHORS:20140811-132046556
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48317
Deposited By: George Porter
Deposited On:11 Aug 2014 22:15
Last Modified:03 Oct 2019 07:02

Repository Staff Only: item control page