Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, M.P. Doukas, U.S. Geological Survey. |
In early October, 1992, a period of intense tremor-like seismicity sent AVO to Level of Concern Color Code RED, the highest level of concern. Although no eruption ensued, this robust plume of magmatic gas and steam was startlingly visible from Anchorage. The activity was later interpreted to be related to vigorous degassing of the hydrothermal system beneath Crater Peak. In early November, an earthquake swarm probably related to shallow intrusion of magma was recorded at shallow levels beneath Crater Peak. Although seismicity slowly declined, AVO scientists continued to measure detectable amounts of sulfur dioxide and carbon dioxide over Crater Peak into the early part of 1993. This probably reflects the continued degassing of unerupted magma stored beneath the vent. Image Credit: M.P. Doukas. U.S. Geological Survey Photo Date: October 2, 1992 June 27, 1992 Mount Spurr USA volcano Following 39 years of inactivity, Crater Peak vent on the south flank of Mount Spurr volcano burst into eruption at 7:04 a.m. Alaska daylight time (ADT) on June 27, 1992. The Municipality of Anchorage reported nearly $2 million in damage, office closures, and cleanup costs from the August eruption. In addition, there were numerous, small-scale losses incurred by businesses. No loss of life resulted directly from the eruptions. However, two heart attacks, one fatal, from shoveling ashfall were reported in Anchorage. Event Data:
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