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The David A. Johnston Cascades Volcano Observatory (CVO) is a volcano observatory in the US that monitors volcanoes in the northern Cascade Range. It was established in the summer of 1980, after the eruption of Mount St. Helens . [ 2 ]
The Cascade volcanoes have had more than 100 eruptions over the past few thousand years, many of them explosive eruptions. [21] However, certain Cascade volcanoes can be dormant for hundreds or thousands of years between eruptions, and therefore the great risk caused by volcanic activity in the regions is not always readily apparent.
United States Geological Survey images (122 F) L. Landsat program (14 P) P. ... Cascades Volcano Observatory; Core Research Center; D. USGS DEM; Digital line graph;
This is a list of Cascade volcanoes, i.e. volcanoes formed as a result of subduction along the Cascadia subduction zone in the Pacific Northwest of North America. The volcanoes are listed from north to south, by province or state: British Columbia , Washington , Oregon , and California .
It is monitored by the Pacific Northwest Seismic Network and the Cascades Volcano Observatory via a seismic station on the southwest flank of the mountain. [47] During the month of September of 2024, the U.S. Geological Survey Cascades Volcano Observatory recorded six earthquakes ranging in magnitudes 0.9 to 2.0. With a normal rate of one ...
Sign showing the full and official name of the David A. Johnston Cascades Volcano Observatory (CVO) Early acts of commemoration included two trees that were planted in Tel Aviv, Israel, [8] and the renaming of a community center in Johnston's hometown as the "Johnston Center". These actions were reported in newspapers during the first ...
Rhyolite from the Quaternary can also be found at Jefferson, though it is not commonly found within the major volcanic centers of the Oregon Cascades. [41] The volcano constitutes a small stratovolcano within the Cascades, with a current volume of 3.4 cubic miles (14 km 3), though prior to erosion and other alterations over time, it may have ...
Anonymous, (2006) CVO Photo Archives: Hydrology and Hydrologic Monitoring Images. Cascades Volcano Observatory, United States Geological Survey, Vancouver, Washington. Glicken, HX, W Meyer, and MA Sabol, (1989) Geology and ground-water hydrology of Spirit Lake blockage, Mount St. Helens, Washington, with implications for lake retention.