Moon Mt shakes on schedule. Why? *fixed*

Here are some seismograms that are a bit confusing to me:

www.abovetopsecret.com...
9/25 Between 8 and 9 am

www.abovetopsecret.com...
9/25 Between 2 and 3 pm, 9/26 Between 8 and 9 am

www.abovetopsecret.com...
9/27 Between 2 and 3 pm, 9/28 Between 2 and 3 pm

www.abovetopsecret.com...
9/28 Between 8 and 9 pm, 9/29 Between 8 and 9 am

They appear to be nearly identical earthquakes and are at unusual times. All of these small tremors are recorded between 9/25 and 9/29, 2004 on Moon Mt near Three Sisters Volcano complex.

Is this some sort of test to check their equipment?
Are they reusing the same data?
Is this a result of heavy equipment being operated near by?
Are they caused by wind?
Are they real earthquakes?
Is this evidence that someone has the technology to create small tremors?

This site discusses the possibility of naturally occuring identical earthquakes and says it is possible, but the earthquakes they site are 12 years apart.

This site reports earthquakes with a greater magnitude than the same quakes reported on PNSN. You can compare the two earthquake maps as well as see the full seismograph recordings the above samples were taken from here.

We have our own theories about what's going on here but would really like your opinions. We would also like to hear from any geologist types who may have a professional opinion.

*edit: there ya go, HarmoniousOne*

[edit on 17-10-2004 by Banshee]

[edit on 10/17/04 by HarmoniusOne]

[edit on 10/17/04 by HarmoniusOne]

Banshee Rocks!!!!

[edit on 10/17/04 by HarmoniusOne]

I have been wondering the same thing HarmoniousOne!! I hope someone can answer!!:

HarmoniusOne,
How close is Moon Mt to the Cascades?
From your USGS data it seems that graphs in blue are "Strong Motion Stations"
www.geophys.washington.edu...

I don't know but perhaps the blue blocks are due to a software upgrade, during which
the station is offline.
Just an idea,
Sanc'.

Originally posted by sanctum
How close is Moon Mt to the Cascades?
From your USGS data it seems that graphs in blue are "Strong Motion Stations"
www.geophys.washington.edu...

Sanc,
Moon Mtn and the rest of the Three Sisters Complex are in the Cascade Range in central Oregon.

These images are cropped from recordings at a short period station. The horizontal lines are different colors to differentiate between 10 minute segments on the webicorder images. I'm not sure why they chose to use the same colors for the lines in the graphs as they use to delineate types of readings. It can cause confusion.

I've been thinking about this. They can't be reusing the same data because the samples are not identical. They are VERY close, but not exact.

Its not likely the result of heavy equipment. Chances are if they were using heavy equipment up there it wouldn't be only for a minute at a time with very long periods in between.

So what is it?