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Explain what will happen in 10 million years' time

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Explain what will happen in 10 million years' time

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The Pacific Plate is subducting under the Eurasian Plate and the Philippine Plate at a rate of 90 mm/yr. The high concentration of sea mounts off the west coast of Japan may slow down subduction or cause pressure to build up at the subduction interface. It is therefore predicted that the Pacific plate will move the Australian continent toward Japan.

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How does our interpretation of subduction relate to surface features (and what these are)

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How does our interpretation of subduction relate to surface features (and what these are)

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As the subducting slab of the Pacific Plate is subducted, a trench forms between the Pacific and the Philippine Sea/North American Plates. The deepest point of the trench (and on Earth) is the Mariana Trench, at 11km depth. Although the plate dips slowly on the surface, tectonic forces cause the plate to make a near-vertical dive to cause the deep trench.

We see island arcs chains forming in areas of ocean-ocean collision
Back arc basins and spreading ridges (esp. near Guam)

We have a plug where the Pacific plate meets the Eurasian Plate

https://maps.ngdc.noaa.gov/viewers/bathymetry/

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Determine the slab dip and draw a cross-section through two portions of it

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Determine the slab dip and draw a cross-section through two portions of it

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Structure of the subduction zone and where is it active?

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Structure of the subduction zone and where is it active?

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o   The structure of the Mariana Trench, changes from steeply dipping areas to the North and South of Japan. Underneath Japan, it dips shallowly with the Earthquakes only reaching a depth of 70 km over a 328 km span.

The trench itself involves three main plates, these are the Pacific plate, the Philippine plate and the North American plate. The pacific plate decends under both plates, however the Philippine plate also subducts under the North American plate creating a triple point.

There are three main areas seen which are possible areas of locking within the trench, these are at North Japan at Hokkaido, Okhotsk Valley, just South of Russia and half way between Japan and Guam. These areas where they are locked are most likely due to large island formations causing the subduction zone to lock.

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Google Earth Movie portraying the subduction slab around Mariana Arc

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Google Earth Movie portraying the subduction slab around Mariana Arc

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Video attached below: