posted on Sep, 30 2004 @ 06:30 PM
Well, Rainier is just getting jickier:
It does appear to be picking up MSH's because the events coincide, but there's something that bothers me. (By the way the MSH webicorder below is
the new June Lake webicorder...it has a bit more delineation between events that helps to do a comparison.)
If you get both of these open in separate windows and lined up at the same time you see that the events at Rainier are coincident with the events at
MSH. But here's what bothers me:
Look at the event on the MSH webicorder at say time 16:00. See how it has a long-period portion that has an extremely small magnitude. Now, flip
over to the Rainier webicorder and look at the event at 16:00. It also has the long-period portion of the event and at a not appreciably diminished
The problem this could reflect (IMHO) is that there is a wave traveling through a magmatic channel (i.e. same big pot of magma). Now, if MHS were to
blow significant enough to have a large resultant magma flow, there could be the chance that a "draw" on Rainier could occur.
Now, in this post that I made many moon ago, I speculated on the thixotropy and gel strength that could possibly come into play in magma columns:
Basically, if you take into account a magma column being "capped" by a thixotropic layer of magma, then what you're looking at is a stopper on top
of a pressurized column of fluid. Now, the magma capping this isn't necessarily solid, but has achieved a sufficient gel strength to act semi-solid
(read the above post). If a draw-down were to occur below this cap (i.e. some of the molten magma column were to be drawn toward MSH), then a dynamic
flow situation would ensue below the cap. The evacuated region would cause an insufficient hydraulic head to maintain the pressurized column below.
So...if the ELP traces we are seeing are indications of communication between MSH and Rainier, I think it's worth keeping an eye on!
[edit on 9-30-2004 by Valhall]