Geodynamics: Brittle Deformation and Faulting Lecture 11.1 - Rock Deformation
Geodynamics: Brittle Deformation and Faulting Lecture 11.1 - Rock Deformation
Geodynamics: Brittle Deformation and Faulting Lecture 11.1 - Rock Deformation
Geodynamics www.helsinki.fi/yliopisto 1
Goals of this lecture
2
Terminology, clarified
• Brittle
• Ductile
• Elastic
• Plastic
• Viscous
3
Terminology, clarified
• Brittle
Deformation ‘types’
• Ductile
• Elastic
4
Terminology, clarified
• ‘Type’ of deformation
6
Elasticity
7
Elasticity
Twiss and Moores, 2007
n or s
n or s
E or 2G
/"
• Stress is proportional to
strain "n or "s
• If stress → 0, strain → 0
(recoverable)
xx = E"xx
8
Let’s see what you’ve learned…
• Reference(s):
Twiss, R. J., & Moores, E. M. (2007). Structural Geology, 2nd Edition. W.H. Freeman Co.