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Around 6,600 years ago, a series of discrete events culminated in the largest tephra-producing eruption in postglacial time at Mount Baker. This is the last episode of undoubted magmatic activity preserved in the geologic record. [5]
5 lis 2023 · The eruptive history of the Mount Baker volcanic field is virtually continuous from 1.3 million years ago to the present, and it includes at least 25 discrete eruptive vents and >100 intruded dikes.
The most recent major eruption of Mount Baker, about 6,700 years ago, began with flank collapse events that resulted in lahars that moved down the Middle Fork and Nooksack Rivers as well as down the east flank (damming Baker River and creating Baker Lake) and ended with a widespread tephra fall.
30 paź 2023 · Future magmatic eruptions at Mount Baker are likely to be preceded by changes at the volcano that could be detected by modern volcano-monitoring techniques. Magma moving up into a volcanic edifice causes rock fracturing, deforms the ground surface, and releases magmatic gases.
1 cze 2003 · Mount Baker, a steaming, ice-mantled, andesitic stratovolcano, is the most conspicuous component of a multivent Quaternary volcanic field active almost continuously since 1.3 Ma. More than 70 packages of lava flows and ∼110 dikes have been mapped, ∼500 samples chemically analyzed, and ∼80 K-Ar and 40 Ar/ 39 Ar ages determined.
The 1980 Mount St. Helens eruption, with its dramatic edifice collapse, extraordinary pyroclastic density current, and catastrophic lahars, invigorated the scientific community into studying these then little-known processes.
From about 900,000 years ago to the present, numerous andesitic volcanic centers in the area have come and gone, eroded by glaciers. The largest is the Black Buttes edifice, active between 400,000 and 300,000 years ago and formerly bigger than today's Mount Baker.
