Lecture 8 (September 23)

Lecture 8 (September 23) - Dip-Slip faults o Faults with a...

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Dip-Slip faults o Faults with a vertical component of slip (hanging wall moves up or down) Normal faults and reverse faults Strike-Slip faults o Horizontal motion on (usually vertical flats) Right lateral ex. San Andreas fault, North Anatolian fault Left lateral o ex. Garlock fault 3 principal stresses o Sigma 1 = maximum compressive stress (b/c it’s in the earth with rocks overhead) o Sigma 2 = intermediate compressive stress o Sigma 3 = minimum compressive stress India and Asia continental collision o North-South, horizontal = Sigma 1 stress o East-West = Sigma 2 stress o Vertical = Sigma 3 stress Nature is always seeking the easiest mechanical solution Anderson’s Theory of Faulting o Sigma 1 is vertical = Normal fault o Sigma 2 is vertical = Strike-Slip fault o Sigma 3 is vertical = Thrust fault Cascadia Subduction zone o Pacific-North-America plate boundary, north of the north end of SAF at Cape Mendocino in N. Ca o Juan de Fuca plate creates the Cascadia Subduction zone
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Lecture 8 (September 23) - Dip-Slip faults o Faults with a...

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