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Active volcanoes such as Stromboli, ... Hawaii hotspot, Meiji Seamount is the oldest extant seamount in the Hawaiian-Emperor seamount chain, ...
The oldest identified caldera remnant straddles the border near McDermitt, Nevada–Oregon, although there are volcaniclastic piles and arcuate faults that define caldera complexes more than 60 km (37 mi) in diameter in the Carmacks Group of southwest-central Yukon, Canada, which are interpreted to have been formed 70 million years ago by the ...
This article contains a list of volcanoes in the United States and its territories. Alaska. Name Elevation Location Last eruption meters feet Coordinates; Mount ...
The second part of the chain is composed of the Northwestern Hawaiian Islands, collectively referred to as the Leeward isles, the constituents of which are between 7.2 and 27.7 million years old. [3] Erosion has long since overtaken volcanic activity at these islands, and most of them are atolls, atoll islands, and extinct islands.
Kohala is the oldest of five volcanoes that make up the island of Hawaii.Kohala is an estimated one million years old—so old that it experienced, and recorded, the reversal of Earth's magnetic field 780,000 years ago.
The main shield-building stage of volcanism ended about 470,000 years ago. The summit of the shield volcano was once 800 feet (250 m) above sea level, but subsided below sea level between 435,000 and 365,000 years ago. [1] Māhukona is the oldest volcano to build Hawaiʻi island, older than Kohala and Mauna Kea. [2]
Younger volcanoes that erupted after passing over the hotspot covered the plain with young basalt lava flows in places, including Craters of the Moon National Monument and Preserve. The central Snake River plain is similar to the eastern plain, but differs by having thick sections of interbedded lacustrine (lake) and fluvial (stream) sediments ...
The volcano formed during the Pleistocene in two stages, named Llullaillaco I and Llullaillaco II. The oldest rocks are about 1.5 million years old. About 150,000 years ago, the volcano's southeastern flank collapsed, generating a debris avalanche that reached as far as 25 km from the summit.