Convergent Boundaries—Oceanic Continental

Date Activity Page

5/31 Convergent Boundaries—Oceanic Continental

Tuesday 5/31/11

Learn that convergent plate boundaries are where two plates are coming together.

Learn that subduction is when one plate goes under another plate.

Learn that earthquake, volcanoes and ocean trenches occur in a subduction zone.

You will either be Reading the textbook and making notes orListening the presentation and making notes.

Thinner and denser oceanic plate is forced under thicker and lighter continental crust—This is subduction

Oceanic plate begins to melt at about 100 miles into mantle

Melted plate is less dense so it expands towards the surface creating volcanoes

Notes: Convergent Oceanic-Continental Boundaries

Earthquakes Volcanoes Mountains Deep Ocean Trenches

Convergent Oceanic-Continental

Convergent: Oceanic Continental

Convergent Oceanic-Continental

http://www.iris.edu/hq/files/programs/education_and_outreach/retm/tm_110311_japan/Subduction_ElasticRebound_Tsunami_480.mov

This earthquake was the result of thrust faulting along or near the convergent plate boundary where the Pacific Plate subducts beneath Japan.

This map also shows the rate and direction of motion of the Pacific Plate with respect to the Eurasian Plate near the Japan Trench. The rate of convergence at this plate boundary is about 83 mm/yr (8 cm/year). This is a fairly high convergence rate and this subduction zone is very seismically active.

Magnitude 9.0 NEAR THE EAST COAST OF HONSHU, JAPANMagnitude 9.0 NEAR THE EAST COAST OF HONSHU, JAPANFriday, March 11, 2011 at 05:46:23 UTC Friday, March 11, 2011 at 05:46:23 UTC

Japan Trench