BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 4, pp. 13-90 January 3, 1893 



FINITE HOMOGENEOUS STRAIN, FLOW AND RUPTURE OF 



ROCKS. 



BY GEORGE F. BECKER. 



(Presented before the Society August 16, 1892.) 

 CONTEXTS. 



Page. 



Phenomena and Plan of Discussion 14 



Evidences of Movement 14 



Scope of the Inquiry 15 



Finite rotational Strain K> 



Limitations of the Problem 16 



Displacements 17 



General Conditions 17 



Strain Ellipse IS 



Rotation 19 



Lines of constant Direction 20 



Simple Strains 21 



Pure Rotation 21 



Dilation 21 



Shear 22 



Compound Strains . . Z I 



How treated 23 



Pure Deformation 23 



Shearing Motion or Scission 2-1 



Two Shears in the same Plane 25 



Plane undilational Strain 26 



St rain due to Pressure 29 



Elongation 30 



Planes of maximum tangential Strain 30 



Position of undistorted Planes 30 



Planes of maximum Strain '■'< 1 



Angular Range of undistorted Planes .".1 



Case of tri-dimensional Strain :;:; 



Numerical Example of Strain 34 



Finite Stress 35 



Relation of Stress and Strain 35 



Stresses in a Shear 36 



Simple Pressure 37 



III-Bull. Geol. Soc. Am., \'..i,. -i, 1892. (13) 



