Here Are All The Volcanoes In The US - And How Dangerous They Are

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Here Are All The Volcanoes In The US — And How Dangerous They Are
Business Insider
By Ajai Raj 6 hours ago

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Crater Lake volcano in Oregon, part of the Cascade Range

NASA Marshall Space Flight Center/Flickr

Oregon's Crater Lake volcano, part of the Cascade Range, is among the very high threat volcanos identified by the USGS.

If the recent volcanic eruption in Iceland has got you wondering which volcanoes you should be worrying about, and exactly how much to worry about them, you're in luck.

The United States Geological Surveys Volcano Hazards Program has all the volcano maps and charts you need to make an informed decision about your level of volcano-induced anxiety.

There are 55 dangerous volcanoes in the US. A caveat: this is not a ranking of the volcanoes by their danger level.

As Wendy Stovall, a geologist with USGS, told Business Insider in an e-mail:

There are many volcanoes that are threatening due to factors such as tectonic setting, population density, eruption frequency, and potential to erupt again. The variations in these factors make each of the NVEWS [National Volcano Early Warning System]-designated 'high threat' volcanoes uniquely dangerous.

For a full list of volcanoes by threat level, and a thorough description of how they're monitored, check out pages 20 and 21 of this 2005 volcano report from the USGS. More up-to-date information on individual volcanoes is available on the website for the USGS Volcano Hazards Program.

The volcanoes designated as "Very High Threat" are near large population centers and have the potential to erupt explosively and to trigger lahars — swift, massive landslides of water, mud, and debris that rush downstream after an eruption.

Many of the "High Threat" volcanoes are near smaller population centers and power or transportation infrastructure throughout Alaska. Some of these erupt more frequently, posing significant threats to aviation.

United States Geological Survey

These are the most threatening volcanos in the United States.

Our lack of comprehensive, up-to-date monitoring raises cause for concern. Ashfall from volcanic eruptions can interfere with electronics, make air travel impossible, and endanger human health. Real-time monitoring can save money as well as lives, by enabling local authorities to predict the impact of a given eruption and respond appropriately.

Here's the full map of volcanoes in the U.S., from the USGS. This map shows all of the active volcanoes in the US by their alert level. White triangles mark volcanoes with no ground-based monitoring; green triangles mean there's no imminent cause for concern. The yellow and orange triangles indicate volcanoes that are currently erupting or are likely to erupt soon:


United States Geological Survey

You can see the Aleutian islands (a relatively uninhabited area of Alaska in the Pacific Ocean) is home to a lot of them — 5 "Very High Threat" and 26 "High Threat" volcanoes, as designated in the report. While not located near large populations, eruptions at these volcanoes could significantly disrupt air travel:


Aleutian island chain volcanoes

United States Geological Survey

In the continental US, most of the volcanoes are concentrated along the West Coast, particularly in the Cascades mountain range, part of the Ring of Fire in the Pacific Ocean. This area is home to most of the active volcanoes in the continental US, including nine "Very High Threat" volcanoes.

United States Geological Survey

Here are all the maps and images ,  and the link below !!!!

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http://www.thunting.com/smf/index.php/topic,57756.msg281566.html#msg281566

Back in the day it was pretty cool living close to St. Helens, that was where we elk hunted each year until 80. We were camping at Goose lake that sunday morning, 15 miles as the crow flies south east of St. Helens when it blew. We woke to shaking and what sounded like rocks landing on the motor home and once we all got up and realized what was going on we couldn't get outta there fast enough. I think my dad almost crashed that motorhome a half dozen times on the way down out of the mountains. We hit the wind river Hyw and it started to sputter, it had sucked in a ton of ash and we limped it all the way to Washougal,Wa before it crapped out. We ended up with around 2 inches of ash where we lived in Vancouver at the time. That crap was a mess for a long long time and really screwed up our hunting area in the pine creek, lahar and ape canyon area.

Since then I have climbed St. Helens 4 times, Adams once and Rainier once. It still is an amazing view from atop St. Helens and to this day I'll never forget the power that a volcano can produce especially after witnessing the aftermath.

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