There is Plenty of Signal in the Noise

Friday, April 26, 2002 - 11:00am - 12:00pm
Keller 3-180
John Scales (Colorado School of Mines)
The concept of noise is a subjective one. A practical definition of noise might be that it consists of that portion of the data which one has no interest in explaining or which one is unable to explain. In geophysics, by far the largest component of uncertainty in the data is unmodeled physics. In exploration seismology, for example, surface waves, mode-converted waves, multiply-scattered waves, are all frequently treated as noise. Indeed concerted effort to suppress multiply-reflected waves is one of the most important practical problems in seismic exploration. Whereas in global seismology, surface waves and mode-converted waves are prime tools for imaging the earth's interior. Using examples from a variety of scientificolor=#FF0000c disciplines, we will see how data once regarded as noise, can be exploited as signal to make useful inferences. Indeed there is a lot of signal lurking in our noise.