A recent report on volcanoes here in the US has people questioning a lot of things. When it comes to assessing volcanic threat I am sure no one expected this.
Researchers from the USGS have made it clear the threat level coming forth from good ole Yellowstone is much higher than most are led to believe. Since this report is the first to reassess things since 2006, it brings forth a sense of terror like nothing else. In this report, these researchers list eighteen volcanoes as being ‘high threats.’ Interesting enough, eleven of those eighteen are located Washington, Oregon, or California.
When it comes to rankings Yellowstone was only number 21st and the most dangerous few are said to be located in Alaska. In order to come up with this researchers combed through a list of things. They looked at what kind of volcanoes they were going over, the risks of an eruption, seismic activity in the area and so forth.
When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U.S. Geological Survey and its partners. This update of the volcano threat assessment of Ewert and others (2005) considers new research in order to determine which volcanic systems should be added or removed from the list of potentially active volcanoes, updates the scoring of active volcanoes, and updates the 24-factor hazard and exposure matrix used to create the threat ranking. The threat assessment places volcanoes into five threat categories: very low, low, moderate, high, and very high. Within all five threat categories there are changes in relative rankings of volcanoes, and in a few cases, volcanoes moved between categories owing to changes in our understanding of their hazard, unrest, and exposure factors. Scorings of hazard factors were updated for some volcanoes where new research has identified Holocene eruptive activity or clarified our understanding of Holocene eruptive history and the occurrence of particular hazards such as tephra fall or pyroclastic density currents. The most numerous scoring changes made in the threat matrix since 2005 have been made among the hazard factors, particularly those accounting for observed eruptive activity or unrest.
The very low threat category underwent the greatest amount of change, dropping from 32 to 21 volcanoes, owing to better knowledge of the eruptive histories of those volcanoes. The list of 18 very high threat volcanoes determined by Ewert and others (2005) remains the same; 11 of the 18 volcanoes are located in Washington, Oregon, or California, where explosive and often snow- and ice-covered edifices can project hazards long distances to densely populated and highly developed areas. Five of the 18 very high threat volcanoes are in Alaska near important population centers, economic infrastructure, or below busy air traffic corridors. The remaining two very high threat volcanoes are on the Island of Hawaiʻi, where densely populated and highly developed areas now exist on the flanks of highly active volcanoes. The high- and moderate-threat categories are dominated by Alaskan volcanoes. In these categories, the generally more active and more explosive volcanoes in Alaska can have a substantial effect on national and international aviation, and large eruptions from any of the moderate- to very-high-threat volcanoes could cause regional or national-scale disasters. This revised threat assessment includes 18 very high threat, 39 high threat, 49 moderate threat, 34 low threat, and 21 very low threat volcanoes. The total of 161 volcanoes is a decrease of 8 from the total reported by Ewert and others (2005).
Sure, Yellowstone might not erupt anytime soon but it’s threat levels are much more intense than we had assumed. This Super-volcano and other volcanos here in the US need to be looked into more closely. Many of the high risk volcanoes on this list are nowhere near as monitored as properly as they should be. For more information on this topic please check out the video below.