From UNH's 2013-2014 CCOM/JHC Seminar Series: Dylan Mikesell, an NSF Postdoctoral Fellow in MIT's Earth Resources Laboratory, presents, "An Introduction to Seismic Interferometry and Imaging with Seismic Noise." This talk was recorded on March 21, 2014 in UNH's Jere A. Chase Ocean Engineering Laboratory.
Using ambient seismic noise for imaging subsurface structure dates back to the development of the spatial autocorrelation (SPAC) method in the 1950s. However, not until recently have numerical and laboratory experiments shown how crosscorrelation of noise recorded at two points provides an actual estimate of the impulse response between these points. This correlation technique has been termed Seismic Interferometry (SI) in the active-source seismology community. In this talk we will investigate how the crosscorrelation of seismic records yields the impulse response. Both active sources and ambient-noise sources will be discussed. Furthermore, I will discuss the links between the SPAC and SI methods, demonstrate how they work, and show examples of imaging and monitoring using seismic noise correlations.