Plate Margins on a flat planet ConstructiveConvergent Transform LL Transform RL.

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

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Transcript of Plate Margins on a flat planet ConstructiveConvergent Transform LL Transform RL.

Page 1: Plate Margins on a flat planet ConstructiveConvergent Transform LL Transform RL.

Plate Margins on a flat planet

Constructive Convergent

Transform LL

Transform RL

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

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Plattenränder:a) Konstruktiv (mittelozeanischer Rücken), Spreizungsrate 2cm/yrc) Destruktiv (Subduktionszone), Subduktionsrate 10cm/yre) Konservativ (Transformstörung), Relativbewegung 6cm/yrb) Relativbewegung A/B = 4cm/yrd) Ibid 10cm/yrf) Ibid 6cm/yr

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6 Arten dextraler (rechtshändiger) Transform-Störungen:

a) Rücken/Rücken (die häufigste Transform Störung in ozeanischen Becken)b)/c) Rücken/Subduktiond)/e)/f) Subduktion/Subduktion ( häufige Transformstörung auf Kontinenten)

z.B. San Andreas

(Es gibt ebenso 6 sinistrale (linkshändige) Transform Störungen.)

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Rogers, 2008

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Hot spot

www.tulane.edu/.../geol204/volclandforms.htm www.gasd.k12.pa.us/~dpompa/Mini%20Lecture.html

www.geophysik.uni-frankfurt.de/~schmelin/

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Hot spot

www.tulane.edu/.../geol204/volclandforms.htm www.gasd.k12.pa.us/~dpompa/Mini%20Lecture.html

www.geophysik.uni-frankfurt.de/~schmelin/

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Hotspots

Dataset from Smithsonian (not all point are real hotsp

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Inverting for the plates Euler pole

Rigid plate rotation: V = Ω x P

V·n = Vn

V·e = Ve

Rogers, 2008

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Example AF EU motion at GibraltarEulerian pole :

Ω = (-0.1728, 0.1327,-0.1059) deg/Myr)

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Coordinates Gibraltar 36N 6W (-6E)

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Vn = n ·(Ω x r) = (r x n) ·ΩVe = e ·(Ω x r) = (r x e) ·Ω

(r x n)x (r x n)y (r x n)z Ωx Vn(r x e)x (r x e)y (r x e)z Ωy Ve

Ωz

Invert for Ω that minimizes residual (Vcomputed - Vobserved)

Inverting for the plates Euler pole

Rigid plate rotation: V = Ω x r

V·n = Vn

V·e = Ve

· =

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CO NZ pole:4.8N 124.3W 1.36 deg/Myr

V @ 7.5N 82W:

67.8 mm/yr

N359E

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Rogers, 2008

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

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How fast plates move ???

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Processed GPS data for Pacific plate in IGSb00 reference frame

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Stable Pacific plate reference frame

Residual motion of GPS stations w.r.t. Pacfic plate Euler vector

63.69° S110.77° E

0.679+0.002

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Transform fault???Only for constructive margines!

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Velocity Of EU wrt AF

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Marshak, 2005

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.

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How many plates???

Seismicity from USGS Volcanoes from Smithsonian institute

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How many plates???

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NA EU pole:62N 135E


Shear margins: Continent-ocean transform and - Bird Geophysical

Shear margins: Continent-ocean transform and - Bird Geophysical

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Operating Margins

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Adjusting Margins

Adjusting Margins

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Culture-CenteredProcessesof …wwcare/wp-content/uploads/2020/...everyday organizing for radical democracy in communities at the margins to transform the unhealthy structures and generate

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NOMINATED RL LIST2201528586GUNPAL RL\827 2406502093RIYASAT ALI RL\828 2405010222JITENDRA KUMAR SHARMA RL\831 2405519571TILAK CHOUDHARY RL\832 2201007005BALWAN SINGH RL\834 2405500408TARACHAND

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Contiental Margins

Contiental Margins