Register for an account

X

Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.

X

Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.

The Sciences

Redoubt back to Yellow Alert

Rocky Planet iconRocky PlanetBy Erik KlemettiMarch 18, 2009 11:24 AM

Newsletter

Sign up for our email newsletter for the latest science news

placeholder

Image from AVO Hut webcam for Redoubt

After an exciting few days ... well, OK ... after an exciting few hours on Sunday, AVO has decided to lower the alert level at Redoubt in Alaska to Yellow/Advisory. The alert level was lowered last week after seismicity at the volcano returned to normal after weeks of rumbling (at Orange/Watch status), but then we are all caught by surprise when a phreatic explosion occurred (and AVO returned the volcano to Orange). However, this didn't lead to a new period of heightened seismicity, so back to Yellow we go (even with elevated gas emissions and a nice steam plume - above).

The lowering of the status was support the idea that Sunday's explosion was merely caused by water violently flashing to steam and that none of the ash seen on the snow near the 1989-1990 dome was juvenile (new magma). Of course, now we should expect that there could be more phreatic explosions like these, so as with any active volcano, never get too comfortable.

3 Free Articles Left

Want it all? Get unlimited access when you subscribe.

Subscribe

Already a subscriber? Register or Log In

Want unlimited access?

Subscribe today and save 70%

Subscribe

Already a subscriber? Register or Log In