Sea Floor Feature Cascadia Subduction Zone Deep Sea Trench

There are some unusual features at the cascade subduction zone where the juan de fuca plate sinks beneath the north american plate there is no deep trench seismicity earthquakes is less than expected and there is evidence of a decline in volcanic activity over the past few million years.

Sea floor feature cascadia subduction zone deep sea trench.

The result is a topographic depression where the oceanic plate comes. The deepest of these is the mariana trench at over 36 000 feet below sea level. Deep sea trenches generally lie seaward of and parallel to adjacent island arcs or mountain ranges of the continental margins they are closely associated with and found in subduction zones that is locations where a lithospheric plate bearing oceanic crust slides down into the upper mantle under the force of gravity. The process of subduction.

What are deep sea trenches. Features rising up from the ocean floor include seamounts volcanic islands and the mid oceanic ridges and rises. Below the ocean floor there are a few small deeper areas called ocean trenches. Cascadia subduction zone in the pacific northwest of the united states.

The pacific northwest is an exciting place to observe geologic processes in action. Deep sea trenches are the topographic expressions of a subduction zone. The ocean floor is called the abyssal plain. Where the subducting slab bends downward a deep sea trench forms.

Trenches capture a lot of sediment from nearby land masses much of which is carried down along with the slab. As subduction occurs crust closer to a mid. It separates the juan de fuca and north america plates. Deep sea trench a narrow elongated depression of the deep ocean floor parallel to the trend of a volcanic arc.

Oceanic trenches are topographic depressions of the sea floor relatively narrow in width but very long. Oceanic trenches are a distinctive morphological feature of convergent plate boundaries along which lithospheric plates move towards each other at rates that vary from a few millimeters to over ten centimeters per year. Where is the cascadia subduction zone and what happens there what are deep sea trenches a narrow elongated depression of the deep ocean floor parallel to the trend of a volcano arc. Cross section through cascadia subduction zone showing subdivision into a zone of stable sliding closest to the trench the locked zone subject to great earthquakes the zone of episodic tremor and slip possibly related to high fluid pressure epicenters in fig.

These oceanographic features are the deepest parts of the ocean floor. National park service sites in the coastal ranges of washington oregon and northern california contain rugged mountains of rocks that were manufactured in the ocean then scraped off the plate and lifted out of the sea. 4 25 and deep zone of stable sliding extending beneath the volcanic arc. The probable explanation lies in the rate of convergence between the juan de fuca and north american.

Features of the ocean include the continental shelf slope and rise.