|Hunting for microseismic reflections using multiplets|
However, the stacked results have been far from perfect. Stacked reflections appear to be weaker than reflections in individual event windows. This has been attributed to the fact that a trace variable shift needs to be applied to the data before stacking that is different when warping the reflection arrival from the direct arrival. Moreover, fractional rather than integer shifts need to be introduced. When such enhancement in shift precision is introduced, we hope that event windows will better stack together, enhancing the S/N ratio and boosting reflections, especially the weak P ones.