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The Ring of Fire does not extend across the southern Pacific Ocean from New Zealand to the Antarctic Peninsula or from New Zealand to the southern tip of South America [33] because the submarine plate boundaries in this part of the Pacific Ocean (the Pacific–Antarctic Ridge, the East Pacific Rise and the Chile Ridge) are divergent instead of ...
Relief map with the East Pacific Rise (shown in light blue), extending south from the Gulf of California. The East Pacific Rise (EPR) is a mid-ocean rise (usually termed an oceanic rise and not a mid-ocean ridge due to its higher rate of spreading that results in less elevation increase and more regular terrain), at a divergent tectonic plate boundary, located along the floor of the Pacific Ocean.
The Pacific Ring of Fire runs parallel to the line and is the world's foremost belt of explosive volcanism. The term andesite line predates the geologic understanding of plate tectonics . The term was first used in 1912 by New Zealand geologist Patrick Marshall to describe the distinct structural and volcanologic boundary extending from east of ...
The East Pacific Rise near Easter Island is the fastest spreading mid-ocean ridge, with a spreading rate of over 15 cm/yr. [2] The Pacific plate moves generally towards the northwest at between 7 and 11 cm/yr while the Juan De Fuca plate has an east-northeasterly movement of some 4 cm/yr. [3]
The south-eastern side is a divergent boundary with the Nazca plate forming the East Pacific Rise. [citation needed] The southern side is a divergent boundary with the Antarctic plate forming the Pacific–Antarctic Ridge. [citation needed] The western side is bounded by the Okhotsk microplate at the Kuril–Kamchatka Trench and the Japan Trench.
During the late Neogene period (23.03-2.58 million years ago), the Japan Trench underwent a period of plate convergence between the Pacific and Okhotsk plates. Based on the sediment sequence during this time, there appears to have been little net accretion of sediment onto the overlying plate as well as evidence of mild erosion at the base of the convergent margin.
Pacific-Antarctic Ridge – Tectonic plate boundary in the South Pacific Ocean; Philippine Mobile Belt – Tectonic boundary; Ring of Fire – Region around the rim of the Pacific Ocean where many volcanic eruptions and earthquakes occur; San Andreas Fault – Geologic feature in California
The trench is a result of a convergent plate boundary, where the eastern edge of the oceanic Nazca plate is being subducted beneath the continental South American plate. [1] The trench is also a part of the Chile triple junction , an unusual junction that consists of a mid-oceanic ridge and the Chile Rise being subducted under the South ...