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Plate Margins on a flat planet

Plate Margins on a flat planet. Transform LL. Constructive. Convergent. Transform RL. http://www.gasd.k12.pa.us/~dpompa/Mini%20Lecture.html. Plattenränder: a) Konstruktiv (mittelozeanischer Rücken), Spreizungsrate 2cm/yr c) Destruktiv (Subduktionszone), Subduktionsrate 10cm/yr

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Plate Margins on a flat planet

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  1. Plate Margins on a flat planet Transform LL Constructive Convergent Transform RL

  2. http://www.gasd.k12.pa.us/~dpompa/Mini%20Lecture.html

  3. Plattenränder: a) Konstruktiv (mittelozeanischer Rücken), Spreizungsrate 2cm/yr c) Destruktiv (Subduktionszone), Subduktionsrate 10cm/yr e) Konservativ (Transformstörung), Relativbewegung 6cm/yr b) Relativbewegung A/B = 4cm/yr d) Ibid 10cm/yr f) Ibid 6cm/yr

  4. 6 Arten dextraler (rechtshändiger) Transform-Störungen: a) Rücken/Rücken (die häufigste Transform Störung in ozeanischen Becken) b)/c) Rücken/Subduktion d)/e)/f) Subduktion/Subduktion ( häufige Transformstörung auf Kontinenten) z.B. San Andreas (Es gibt ebenso 6 sinistrale (linkshändige) Transform Störungen.)

  5. Rogers, 2008

  6. Hot spot www.gasd.k12.pa.us/~dpompa/Mini%20Lecture.html www.tulane.edu/.../geol204/volclandforms.htm www.geophysik.uni-frankfurt.de/~schmelin/

  7. Hot spot www.gasd.k12.pa.us/~dpompa/Mini%20Lecture.html www.tulane.edu/.../geol204/volclandforms.htm www.geophysik.uni-frankfurt.de/~schmelin/

  8. Hotspots Dataset from Smithsonian (not all point are real hotsp

  9. Inverting for the plates Euler pole Rigid plate rotation: V = Ω x P V·n = Vn V·e = Ve Rogers, 2008

  10. Example AF EU motion at Gibraltar Eulerian pole : Ω = (-0.1728, 0.1327,-0.1059) deg/Myr)

  11. Coordinates Gibraltar 36N 6W (-6E)

  12. Inverting for the plates Euler pole Rigid plate rotation: V = Ω x r V·n = Vn V·e = Ve · = Vn = n ·(Ω x r) = (r x n) ·Ω Ve = e ·(Ω x r) = (r x e) ·Ω (r x n)x (r x n)y (r x n)zΩx Vn (r x e)x (r x e)y (r x e)zΩy Ve Ωz Invert for Ω that minimizes residual (Vcomputed - Vobserved)

  13. Problem 3: Do CO and NZ have a subduction?

  14. Problem 3: Do CO and NZ have a subduction? CO NZ pole: 4.8N 124.3W 1.36 deg/Myr V @ 7.5N 82W: 67.8 mm/yr N359E

  15. Rogers, 2008

  16. Beispiel: Mittelatlanik Relativbewegung Afrika, Südamerika wird durch einen Pol nahe des Nordpols beschrieben. Dieser lässt sich aus der Orientierung der Transformstörungen im mittleren Atlantik bestimmen. Die Relativbewegung Amerika/Afrika ist in diesem Segment besonders groß, bedingt durch den fast 90 Grad Abstand zum Rotationspol

  17. How fast plates move ???

  18. Processed GPS data for Pacific plate in IGSb00 reference frame

  19. 63.69° S 110.77° E 0.679+0.002 Stable Pacific plate reference frame Residual motion of GPS stations w.r.t. Pacfic plate Euler vector

  20. Transform fault??? Only for constructive margines!

  21. Velocity Of EU wrt AF

  22. Where do Eqs occur? Earthquake are release of elastic strain accumulated due to deformation. If plate are rigid must be at plate boundaries! In subduction zone the thermal advection play a big role on location of earthquakes. Marshak, 2005

  23. How many plates??? Seismicity from USGS Volcanoes from Smithsonian institute

  24. How many plates???

  25. Problem 2: Why boundary NA EU is not clear? NA EU pole: 62N 135E

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