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Lassen Peak ( / ˈlæsən / LASS-ən ), [ 3] commonly referred to as Mount Lassen, is a 10,457 ft (3,187 m) lava dome volcano in Lassen Volcanic National Park in Northern California. Located in the Shasta Cascade region above the northern Sacramento Valley, it is the southernmost active volcano in the Cascade Range of the Western United States ...
Map of eruption deposits. On March 27, 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States. A series of phreatic blasts occurred from the summit and escalated until a major explosive eruption took place on May 18, 1980, at 8:32 am. The eruption, which had a volcanic ...
Types of volcanic eruptions. Some of the eruptive structures formed during volcanic activity (counterclockwise): a Plinian eruption column, Hawaiian pahoehoe flows, and a lava arc from a Strombolian eruption. Several types of volcanic eruptions —during which material is expelled from a volcanic vent or fissure —have been distinguished by ...
Location of the volcano on the island and risk to population. An explosive eruption occurred at 8:41 a.m. AST (12:41 UTC) on 9 April 2021, with an ash plume reaching approximately 10,000 m (32,000 ft) and drifting eastward towards the Atlantic Ocean. [16] [17] Approximately 16,000 people were told to evacuate the area surrounding the volcano.
A high volcanic cone with a single central vent formed before the 1815 eruption, which follows a stratovolcano shape. [16] The diameter at the base is 60 kilometres (37 mi). [6] The volcano frequently erupted lava, which descended over steep slopes. [16] Tambora has produced trachybasalt and trachyandesite rocks which are rich in potassium.
About 33.9 million ago, the Oligocene epoch of the Paleogene period begins. The Mid-Tertiary ignimbrite flare-up begins 40 million years ago and lasts until 25 million years ago. Bennett Lake Volcanic Complex erupts 50 million years ago with a VEI 7 850 cubic kilometers (204 cu mi) of tephra.
Mount Tambora is a volcano on the island of Sumbawa in present-day Indonesia, then part of the Dutch East Indies, [ 2] and its 1815 eruption was the most powerful volcanic eruption in recorded human history. This volcanic explosivity index (VEI) 7 eruption ejected 37–45 km 3 (8.9–10.8 cubic miles) of dense-rock equivalent (DRE) material ...
Satellite measurements recorded an eruption column of at least 30,000 m (98,000 ft) into the atmosphere. [17] The explosion was hundreds times more powerful than the atomic bomb dropped on Hiroshima, [18] and was heard as far as Fairbanks, Alaska, nearly 10,000 km away. Fluctuations in air pressure were recorded all over the world as the ...