why is it called the pacific ring of fire
The is a ring of volcanoes around the Pacific Ocean that result from subduction of oceanic plates beneath lighter continental plates. Subduction of oceanic. Most of the Earth's volcanoes are located around the Pacific Ring of Fire because that the location of most of the Earth's subduction zones. A subduction zone is a place where one plate of oceanic lithosphere (= the crust + uppermost
) is shoved under another plate. The downgoing plate is always the oceanic one. All while it was oceanic plate it collected water-saturated sediments and its uppermost few hundred meters got water saturated also. As it is shoved into the hotter mantle the plate heats up and all this water and other volatiles boil off and migrate upwards through the overlying plate. The addition of volatiles such as water to the hot overlying mantle causes partial melting and the production of. This magma rises up through the over-lying plate to erupt at the surface. If the overlying plate is a continent, you get a chain of volcanoes such as the Andes or Cascades. If the overlying plate is ocean you get a chain of volcanic islands such as the Marianas or Aleutians.
This is also where the Earth's deep ocean trenches are and where the Earth's deep earthquakes are. The trenches form because the downgoing plate is bent downward as it subducts. The earthquakes form as the two plates scrape against each other (earthquakes down to about 150 km) and then as the downgoing plate bends (earthquakes down to about 700 km). The earthquakes do a very good job of tracing the position of the downgoing plate. These zones of earthquakes are called Wadati-Benioff zones, after the two seismologists who first recognized them. The Ring of Fire is a long chain of volcanoes and other tectonically active structures that surround the Pacific Ocean. The chain runs up along the western coast of South and North America, crosses over the Aleutian Islands in Alaska, runs down the eastern coast of Asia past New Zealand and into the northern coast of Antarctica. The Ring of Fire is one of the most geologically active areas on Earth, and is a site for frequent earthquakes and powerful volcanic eruptions. There are more than 450 active and dormant volcanoes located within the Ring of Fire. Many of these volcanoes were created through the tectonic process of subduction whereby dense ocean plates collide with and slide under lighter continental plates.
The material from the ocean floor melts as it enters the Earthвs interior and then rises to the nearby surface as magma. Noteworthy volcanoes that dot the Ring of Fire include Mount St. Helens in the USA, Mount Fuji in Japan and Mount Pinatubo in the Philippines. Since 1850, of the 16 most powerful volcanic eruptions on Earth have occurred within the Pacific Ring of Fire. Deep ocean trenches are a common feature of the Ring of Fire. These trenches form along subduction zones where slabs of the ocean floor slide into the Earth. The deepest part of the ocean on Earth, the Mariana Trench, is located along the Ring of Fire in the western portion of the Pacific Ocean Basin. The majority of Earthвs earthquakes occur in the Ring of Fire, too. These earthquakes are caused by the sudden lateral or vertical movement of rock along plate margins. of the worldвs largest earthquakes have occurred along the Ring of Fire. The largest earthquake ever recorded on Earth was a 9. 5 magnitude earthquake that struck Chile on May 22, 1960.
Other noteworthy earthquakes that have occurred along the Ring of Fire include a 9. 2 magnitude earthquake that struck Prince William Sound, Alaska on March 28, 1964, a 9. 1 magnitude earthquake that struck off the coast of Sumatra on December 26, 2004 and a 9. 0 earthquake that struck near the coast of Honshu, Japan on March 11, 2011. Despite the high levels of volcanic and seismic activity, millions of people live among the breathtaking landscapes of the Ring of Fire. Scientists are currently working with government officials to help nations in the region improve their response to natural disasters and build their resiliency. Bottom line: The Ring of Fire is a long chain of volcanoes and other tectonically active structures such as ocean trenches and earthquake fault zones that surround the Pacific Ocean. Approximately 90% of the most powerful volcanic eruptions and about 81% of the worldвs largest earthquakes have occurred along the Ring of Fire. The Ring of Fire is home to millions of people who are working to improve their resiliency to natural disasters.
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