Figure 2. Illustration
of the surface method of emission tomography. Movement on the fault causes a
seismic signal that is recorded on the surface array. The array is beam-steered
sequentially at each cell in the subsurface. The seismic energy recorded by
the array over a period of observation time is displayed as colors in the cube,
hotter colors representing higher energy levels. The areas of high energy will
delineate where dynamic activity is taking place.