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Transcript 
Plate Boundaries
Chapter 8
Pages 228-245
Earthquake Locations
•
http://earth.geol.ksu.edu/sgao/g100/plots/0916_global_seismicity.jpg
Tectonic Plate Map
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_08_plates.jpg
Three types of plate boundaries
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_3boundaries.jpg
Diverving plate summary
Diverging
Plates
Icelandic
Rift
http://earth.geol.ksu.edu/sgao/g100/plo
ts/0829_09_iceland.jpg
Three
types of
convergent
margins
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_10_convergent.jpg
Peru-Chile Trench
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_10_convergent.jpg
Ocean-Continent Convergence
Ocean-Ocean Convergence
Japan Trench
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_10_convergent.jpg
Location of Pacific Trenches
India-Asia before collision
Himalayas as a result of collision
Continent-Continent Convergence
Indian Plate
Movement
Himalayan Suture
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_10_convergent.jpg
Summary of
convergent
plates
Transform
Boundary
Transform Faults
Transform Fault Boundary
San Andreas
Transform
Fault
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_11_saf_photo.jpg
Juan de Fuca
Plate
Sea-Floor Spreading and
Plate Boundaries
Dynamo that
creates
magnetic field
•
http://www.nasa.gov/vision/earth/lookingatearth/29dec_
magneticfield.html
Movement of
Magnetic
North
•
http://www.nasa.gov/vision/earth/lookingatearth/29dec_
magneticfield.html
Movement of
Magnetic
pole since
1600s
•
http://www.geolab.nrcan.gc.ca/geomag/long_mvt_nmp2_e.shtml
Apparent
Polar
wandering
for North
America
and
Eurasia
Pole
location
with
moving
continents
Magnetic Reversals in
volcanic stratigraphy
Magnetic
Reversal
Age Scale
Lava Magnetized in Normal Field
Lava Magnetized in reversed field
Later Lava Magnetized in Normal
Field
Sea floor spreading
documented by magnetic
reversals
Age of Sea Floor
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_04_age_of_ocean_floor.jpg
Earthquake Locations
Japan Trench earthquakes
JOIDES Resolution
Age of Emperor Seamount Chain
Velocities of Plates
Radio Telescope
200 million years ago
150 million years ago
100 million years ago
50 million years ago
Present day location of
continents on tectonic plates
Convection
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_12_convection.jpg
Two-layer Model of
Circulation of Mantle
Single Layer Model of Mantle
Convection
Lava Lamp Model of Mantle
Convection
• Two layer model
matches chemical
differences in mid-ocean
ridge and hotspot basalt
• Single layer model
matches seismic
information about mantle
• At present, the ‘lava
lamp’ model fits the
available data
Three
mantle
convection
models
compared
Mantle Convection
Plates
Relationship of crust,
lithosphere and asthenosphere
•
http://earth.geol.ksu.edu/sgao/g100/plots/0829_12_litho.jpg
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