reply to post by PuterMan
Yeah, duck. Quack, even.
I was just trying to figure out if I could make out distinct P and S waves, by zooming way in on the waveforms in GEE, and I believe I can see them. I
see what appear to be separate P and S waves for most quakes. And that puts a +1 in the seismic column for me as opposed to ice.
As to the frequency content discussion, maybe I am not being quite clear enough with the point I am attempting to make. The issue is not with
filtering or attenuation. The issue was with the sound source creating 3-4 Hz. But apparently, as I posted before, they are saying ice can produce
frequencies lower than quakes. So now my next question becomes this: Are the frequencies being produced in this series comparable to the center
frequencies of other volcanic type quakes?
My own answer to that question if someone asked me, would be- from what I have seen of volcanic type quakes, the frequencies of these are a touch
lower. But that might easily be explained by the sheer size of this beast. Mt. Rainier is huge. And therefore resonant frequencies are going to be
inherently lower than a smaller volcano like St. Helens. And therefore the 3-4 Hz we see now as opposed to the 4-6 Hz centers we see at smaller
volcanoes could be because of that.
That would be one argument towards seismic.
Another argument against ice is the time of year these are occurring. Ice quakes tend to happen more in the warmer months as melt creates a layer of
water which then acts as a lubricator allowing the ice to move. And the ice does move. Of that there is no question.
Problem is, we've been in Winter for a couple weeks. And ice quakes can also happen in the winter, but those winter ice movements are usually more
associated with larger bodies of water.
Unusual to see PM so adamant about it being quakes.
Kinda neat. Almost always it's never a quake, just an error or man made activity. So yeah, at
this point though the pro experts may say otherwise, there are more indicators of seismicity than ice.
If Rainier blows up in their face all of a sudden, there is going to be hell to pay. Cause the warning signs were there. That was an excellent
comparison btw wc, to the Helens webicorders. Scarily similar.
Ok, so maybe this thread ain't dead yet. Thanks PM, wc, and everyone, and a very personal Happy New Year to you all and Family.