Sea Floor Spreading And Subduction Animation

Trenches accretionary wedges prisms and volcanic or island arcs are key surface features produced by subduction.

Sea floor spreading and subduction animation.

Subduction is one of the two major processes of plate tectonics the other being seafloor spreading. Seafloor spreading and plate boundaries. The denser lithospheric material then melts back into the earth s mantle. Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor.

As upwelling of magma continues the plates continue to diverge a process known as seafloor spreading samples collected from the ocean floor show that the age of oceanic crust increases with distance from the spreading centre important evidence in favour of this process. Because of these processes the ocean floor is renewed about every 200 million years. Seafloor spreading is one of the two major processes of plate tectonics the other being subduction. The process of subduction and sea floor spreading can change the size and shape of the oceans.

I didn t know it would come to this. The rate at which new oceanic lithosphere is added to each tectonic plate on either side of a mid ocean ridge is the spreading half rate and is equal to half of the spreading rate. Subduction happens where tectonic plates crash into each other instead of spreading apart. This animation depicts a 100 000 year time span of seafloor spreading.

I m sorry you somehow found this. These age data also allow the rate of seafloor spreading to be determined and they show that rates. Spreading rate is the rate at which an ocean basin widens due to seafloor spreading. Spreading rates determine if the ridge is fast intermediate or slow.

It also shows the subduction of oceanic crust under continental crust and the resulting formation of magma and subsequent volcanism. This report describes how to build a model of the outer 300 km 180 miles of the earth that can be used to develop a better understanding of the principal features of plate tectonics including sea floor spreading the pattern of magnetic stripes frozen into the sea floor transform faulting thrust faulting subduction and volcanism. Seafloor spreading is just one part of plate tectonics. That is the time it takes for new rock to form at the mid ocean ridge move atoss the ocean and sink into a trench.

At subduction zones the edge of the denser plate subducts or slides beneath the less dense one.