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Originally posted by Thought Provoker
reply to post by onthelookout
Timeframes, people, timeframes. Look again at the image Roald posted (I have it on my site too, for reference; www.isthisthingon.org... ). See the time range at the bottom? It clearly shows between 15 and 20 peaks in 10 seconds. Frequency (peaks per second) is the reciprocal of wavelength (seconds per peak); therefore, the frequency of the harmonic tremors in that image is 1.5 to 2.0 Hz.
Now look at the 1/25 image everyone's freaking out about. Each vertical grey line is a full minute, and I estimate there are about about 12 peaks per minute. That works out to 0.2Hz for the frequency, much too slow to be harmonic tremors; those are always at least 1 Hz (see this and this and Google if you don't believe me). Whatever's on the YSB trace, it is not harmonic tremors. Notice how on this USGS page, that sample image has absolutely no time range shown on the X axis? Unforgiveably negligent of them. Very unscientific, and very misleading. We should all demand a refund from the IRS for such misspent tax dollars.
In brief, don't just look at the shape of a waveform to determine what it is. That isn't enough to go on.
My apologies if anyone else already clarified this. One day it was at page 666; the next time I looked, there were 11 new pages. I'm a bit pressed for time right now. Work sucks.
Regarding frequency, have you considered the effect of how an event recorded on a broad-band seismograph, might appear on a narrow-band machine?
YOu might be interested to know that the snippet from the USGS "Harmonic Tremor" definition is taken from this larger seismogram:
Originally posted by Thought Provoker
reply to post by Trip3
Regarding frequency, have you considered the effect of how an event recorded on a broad-band seismograph, might appear on a narrow-band machine?
There are seismometers that can't capture events in the 1 to 10 Hz range? There are seismometers that filter out those frequencies? I'd think such a device would be useless in the extreme. But what do I know. Also, what is a "narrow-band machine"? What kind of machine, if not the seismo itself?
Originally posted by kennylee
reply to post by herenow
Thank you so much my friend! I have my E-Quake back after almost a year! Very much appreciated!
@Robin.
Is there a map of all the fracking wells around Yellowstone? It would be interesting to see...