Propagation of the seismic wave Propagation of the seismic wave
Propagation of the seismic wave Propagation of the seismic wave
Propagation of the seismic wave Propagation of the seismic wave
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4- Diffraction:<br />
it takes place when <strong>the</strong> <strong>seismic</strong> <strong>wave</strong> hits:<br />
1- Irregularity<br />
2- Abrupt discontinuity<br />
3- Faults<br />
In this case <strong>the</strong> irregular feature act as point source for radiating <strong>wave</strong>s in all<br />
directions.<br />
Source<br />
Surface<br />
V1<br />
V2<br />
Faults<br />
5- Multiple:<br />
They are signals undergone more than one reflection, and <strong>the</strong>y are <strong>of</strong><br />
small energy<br />
There are two types <strong>of</strong> multiples:<br />
1-Short path multiples : They are almost arrived with useful signals and form a tail to<br />
<strong>the</strong>m, such as<br />
A- Ghost<br />
B- Near-surface multiples<br />
C- Peg-leg Multiples
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