reply to post by questioningall
Hate to say this but there's a lot of information and opinion about your query within this thread.
But to be fair, as reading back through what
amounts to a long novel would take a few days, I can suggest that if you click on the "thread" tag at the bottom of my post, you'll be able to see
all my posts on this thread and among the more recent ones you'll find a lot, including links to other posters who have been involved in the
discussions.
You can use the same method to selectively read the posts of any member, of course.
Meanwhile, a short summary of possible causes for the lake's increasing outflow above the mean would include:
Above-normal inflow into the lake. This does not appear to be supported by posts that give links to readings for other watercourses in the region.
A possible heat source within the lake that is melting surface ice. This is unconfirmed to date but cannot be excluded.
A source or sources of water in the lake, such as hydrothermal vents, that is/are spewing out more water than usual. It is known that there are vents
in the lake but what they are doing right now is unknown to us.
A rise in part of the lake bed. This is possible as there are known to be "domed" areas in the northern part of the lake where the first swarm
occurred.
A drop in the ground level by the lake's outflow region. There is scientific evidence that this is possible. A change in gradient of the river bed
near the outflow is also known to occur in relation to an increase in the height of the main caldera dome, and I've given a reference to a fairly
recent scientific research document (2003 I think) that states this unequivocally.
Normal variation. Studies of the past twenty years of graphs for outflow do show some periods of upward trending from the mean at this time of year.
However, none of them appear to show such large, very short-term variations in outflow, as we are seeing right now.
A tilting of the entire lake region. Only a very small "tilt" of that area of land would be needed to cause increased (or decreased) outflow,
depending on the direction of tilt. However, in that case, the outflow change would be presumably pretty constant; even if increasing it would be a
steady trend. The hour-by-hour swings in flow are quite large and would seem to deny this possibility as a base cause. (But it could be a
contributor.)
I think that's most of them. Other members can add extra ones.
Edit to add: water tables are also important to consider, but the problem is we have very little information about the actual water table
configuration in that region and what, if any changes may have occurred recently. It is of course quite feasible that a quake or series of quakes
could fracture an aquifer and lead to more water finding its way into the lake from even a non-hydrothermal source. If there has been such a
"diversion" we might be made aware of it if nearby towns report losses of water supply drawn from normally reliable aquifers. (Drop in well levels,
changes in water quality, etc.)
Regards,
Mike
[edit on 14/1/09 by JustMike]