By John A. Scales
Seismic imaging tools are presently used to supply pictures of the Earth's subsurface homes at diversified size scales, from high-resolution, near-surface environmental experiences for oil and gasoline exploration to long-period photos of the complete planet. This publication provides the actual and mathematical foundation of imaging algorithms within the context of controlled-source mirrored image seismology. The process taken is prompted by way of actual optics and theoretical seismology. the idea is continually placed into perform through a graded series of laptop routines utilizing the generally to be had SU (Seismic Unix) software program package deal.
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Additional info for Theory of Seismic Imaging
Horizontal resolution is usually measured in terms of the Fresnel zone. Imagine a spherical wave striking the center of a hole punched in an in nite plate. How wide would the hole have to be to allow the sphere to penetrate to one half of its wavelength ? Answer: by de nition, one Fresnel zone. 15). This concept goes back to the Huygens-Fresnel principle previously discussed. Picture a point source in an in nite homogeneous medium. As we will see later, the spatial part of the solution of the wave equation in this case is eikr =r where r is the distance from the origin of the disturbance to the wavefront and k is the reciprocal wavelength.
Consider the limiting case of re ections from a vertical layer (90 degree dip). Since CHAPTER 1. 11: 10 common source gathers for a 5 layer constant velocity model (left). Stacking velocity analysis for these gathers (right). 12: 10 common source gathers for a 5 layer model with a constant v(z) gradient (left). Stacking velocity analysis for these gathers (right). 7. 13: Unless the re ector is horizontal, the apparent dip on the time section is always less than the true dip in the earth. the re ections must propagate along the surface, the zero-o set section will have a linear moveout whose slope is inversely proportional to the velocity.
Amps=a1,a2,... ,0. trapezoid-like bandpass filter Examples of filters: Bandpass: sufilter