Redoubt Reawakens - Code Yellow
Posted by JAC on 4/6/2010, 7:14 am
 The steam plume from the new dome on Redoubt, taken in January 2010. Image courtesy of USGS/AVO, taken by Dennis Anderson. News comes out of Alaska that a small earthquake swarm has begun under Redoubt. http://www.google.com/hostednews/ap/article/ALeqM5j8VGiRVV36COvlIWeZk4NOj06C2wD9ET3UR80 This is the second such swarm since the volcano's 2009 activity ceased. Most of the seismicity appears to be near the summit of the volcano, which would suggest that magma might be moving underneath the new dome that is still steaming. http://www.adn.com/2010/04/05/1212866/redoubt-rumbles-alert-level-raised.html AVO describes the unrest: "This morning, at roughly 01:44 AKDT (0944 UTC) a series of small repetitive earthquakes began occurring in the vicinity of the volcano's summit." If new magma is rising, we might expect to see some phreatic explosions, following by ash plumes and/or a collapse of the new dome producing pyroclastic flows. AVO has returned Redoubt to "Yellow" status, meaning the volcano is showing signs of unrest. http://www.adn.com/2010/04/05/1212866/redoubt-rumbles-alert-level-raised.html AVO raised the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY at Redoubt volcano this morning. A series of small repetitive earthquakes began at 01:44 AKDT (0944 UTC) this today in the vicinity of the volcano's summit. Activity is continuing this afternoon. See http://www.avo.alaska.edu/webicorders/Redoubt/RSO_EHZ_AV.php These earthquakes may be precursory to renewed eruptive activity at the volcano and increased instability of the lava dome. Whether this will result in explosive activity or failure of the lava dome is unknown at this time. However, there is a heightened possibility of volcanic activity that would produce a volcanic ash cloud, pyroclastic avalanches, and lahars and flooding down the Drift River.  |
98
In this thread:
- Re: Redoubt Reawakens - Code Yellow - Conclue, 4/6/2010, 7:17 pm
Post A Reply
This thread has been archived and can no longer receive replies.