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Two of these moving plates meet in western California; the boundary between them is the San Andreas fault. The Pacific Plate (on the west) moves northwestward relative to the North American Plate (on the east), causing earthquakes along the fault.
As one of the Earth’s original continents, the North American Plate started forming some three billion years ago when the planet was much hotter and mantle convection much more vigorous. Roughly two billions years ago, the Earth cooled and these old floating pieces of the lithosphere, called cratons, stopped growing.
The Pacific Plate is being moved north west due to sea floor spreading from the East Pacific Rise (divergent margin) in the Gulf of California. The North American Plate is being pushed west and north west due to sea floor spreading from the Mid Atlantic Ridge (divergent margin).
The North American Plate has a transform boundary with the Pacific Plate, dividing California at the San Andreas Fault. … Near Alaska, the North American Plate meets the Pacific Plate in a convergent boundary, meaning the plates are coming together.
In areas where the plates come together, sometimes volcanoes will form. Volcanoes can also form in the middle of a plate, where magma rises upward until it erupts on the seafloor, at what is called a “hot spot.” The Hawaiian Islands were formed by such a hot spot occurring in the middle of the Pacific Plate.
In the Cretaceous Period, the paleo-Pacific Plate subducted northward under the Asian continent, forming numerous extensional (left-lateral strike-slip) basins in the southern part of the peninsula and the Yellow Sea.
A sharp bend in the chain indicates that the motion of the Pacific Plate abruptly changed about 43 million years ago, as it took a more westerly turn from its earlier northerly direction.
Between the Philippine Sea Plate and the Eurasian Plate is the Philippine Trench, the East Luzon Trench, and the Manila Trench.
When two oceanic plates converge, the denser plate will end up sinking below the less dense plate, leading to the formation of an oceanic subduction zone. … Whenever a subduction zone is formed, the subducted plate will end up being partially melted by the earth’s internal magma and molten.
Geologically speaking, the Philippine archipelago was formed by volcanic eruptions from under the sea and the buckling of the earth’s crust when two tectonic plates collided about 65 million years ago. … A number of the archipelago’s islands continued to grow and rose up from the depths of the ocean floor.
At divergent boundaries, plates separate, forming a narrow rift valley. Here, geysers spurt super-heated water, and magma, or molten rock, rises from the mantle and solidifies into basalt, forming new crust. Thus, at divergent boundaries, oceanic crust is created.
At DIVERGENT boundaries the plates move apart allowing molten magma to rise and form new crust in the form of ridges, valleys and volcanoes. Landforms created by divergent plates include the Mid Atlantic Ridge and the Great African Rift Valley.
The Pacific plate was involved in the 1906 San Francisco earthquake this is because the Pacific Plate “slides horizontally northwestward relative to the North American Plate on the east”( USGS, 2015), causing earthquakes along the San Andreas and associated faults.