effect of erosion on mountain building
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Effect of erosion on mountain building. Background on work budget Background on erosion Erosion exercise Data analysis. whatever. Do fault systems evolve in order to minimize the total work?. Is the Earth Lazy?. Evidence of lazy Earth.

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effect of erosion on mountain building

Effect of erosion on mountain building

Background on work budget

Background on erosion

Erosion exercise

Data analysis

is the earth lazy
whatever

Do fault systems evolve in order to minimize the total work?

Is the Earth Lazy?

evidence of lazy earth
Evidence of lazy Earth

Geometry of spreading centers [Sleep, 1979] and mudcracks reflects work minimization

  • Faults become more smooth with greater slip
    • Strike-slip traces [e.g. Wesnousky, 1988], extensional fault traces [Gupta et al., 1998], and lab [Scholz, 1990].
underthrust accretion cycle
Underthrust-Accretion Cycle
  • Accretion: new forethrust
  • Underthrusting
  • Accretion: new forethrust
  • Underthrusting
sandbox experiments
Sandbox experiments
  • Adams et al. 2001, JSG
  • Particle Integrated Velocity records the development of accreting forethrust within10 cm of contraction
model set up
ForethrustModel Set-Up
  • Simulate 0.5 cm of contraction
conclusions thus far
Conclusions thus far…
  • Sandboxes are lazy!
  • The Earth might be lazy.

?

equilibrium
Equilibrium
  • At equilibrium the ratio of wedge thickness to wedge length is constant.
  • Erosion can disrupt this equilibrium
erosion
Erosion
  • Iceland
implications
Implications
  • After erosion the wedge thickens rather than lengthening. Can accommodate contraction efficiently along the old faults
  • On the non-erosion side, wedge must constantly lengthen because the old faults are buried under heavy sand.
  • Fault system adjusts to slip along the most efficient path <- earth is lazy!
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