A Caltech Library Service

Creep Measurements in Igneous Rocks with Some Applications to Aftershock Theory


Lomnitz, Cinna (1955) Creep Measurements in Igneous Rocks with Some Applications to Aftershock Theory. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/A2KE-9Y60.


First Part.

Cylindrical specimens of Southern California granodiorite and gabbro were creep-tested at constant torques in a high-magnification torsion apparatus. Complete creep and creep recovery curves at room temperature were recorded for periods of about 10,000 minutes.

The results are represented by an empirical equation of the form: s = p (a+b log t) where s is the strain, p the stress and t the time. No evidence was found of creep behavior suggestive of the Michelson equation.

For some granodiorite samples the viscosity was of the order of 3 x 10¹⁵ poises. The behavior of the rocks under prevailing test conditions was not appreciably different from that of other polycrystalline materials.

Second Part.

A quantitative treatment of the Benioff aftershock sequences on the basis of the theory of viscoelasticity is given. The minimum coefficient of viscosity found by this method is of the order of 10[superscript 19] poises, in good agreement with accepted viscosity values for the earth's crust.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Geophysics and Civil Engineering)
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Geophysics
Minor Option:Civil Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Benioff, Hugo
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1955
Additional Information:Title varies slightly in 1955 Caltech commencement program: "Creep Measurements in Igneous Rocks with Some Application to Aftershock Theory".
Record Number:CaltechETD:etd-01082004-111506
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63
Deposited By: Imported from ETD-db
Deposited On:12 Jan 2004
Last Modified:06 Jul 2023 17:43

Thesis Files

PDF (Lomnitz_c_1955.pdf) - Final Version
See Usage Policy.


Repository Staff Only: item control page