[Amath-seminars] Boeing Seminar - Thursday Feb. 4 - George Papanicolaou

Eli Shlizerman shlizee at uw.edu
Sun Jan 31 22:17:17 PST 2010

Dear All,

The second Boeing Distinguished Lecture of the winter quarter will take
place this Thursday, Feb. 4, at 4:00 pm at *Sieg Hall 134*. Notice the
change in the location.

Please join us for a reception afterwards on the 4th floor of Guggenheim.

Boeing Distinguished Lecture Series

"Imaging with noise"

George Papanicolaou,
Mathematics Department,
Stanford University

Time & Location:
Thursday, Feb. 4, at 4:00 pm at Sieg Hall 134

It is somewhat surprising at first that it is possible to locate a network
of sensors from cross correlations of noise signals that they record. This
is assuming that the speed of propagation in the ambient environment
is known and that the noise sources are sufficiently diverse. If the
sensor locations are known and the propagation speed is not known
then it can be estimated from cross correlation information. Although
a basic understanding of these possibilities had been available for some
time, it is the success of recent applications in seismology that have
revealed the great potential of correlation methods, passive sensors and
the constructive use of ambient noise in imaging. I will introduce these
ideas in an interdisciplinary, mathematical way and show that a great
deal can be done with them. Things become more complicated, and
a mathematically more interesting, when the ambient medium is also
strongly scattering. I will end with a review of what is known so far
in this case, and what might be expected.
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