Aligning microseismic reflections for imaging |

We used our running window cross-correlation program to cross-correlate direct P arrivals with whole seismograms with the hope of finding P-reflections. Results of such an approach can be seen on Figure 4(b). We can see in this figure that on the original seismogram, the P reflection seen at around 2.2s was not apparent and was actually brought up by the cross-correlation of the direct P with the whole seismogram. It turns out that the stronger the P arrival we use in cross correlations, the more likely we are to find an arrival that can be a P-reflection.

Bonner0209,B0209-p
a) seismogram with P-reflection not
strong enough to be seen
b) cross-correlation result with direct P-wave, with a possible reflection appearing at about
0.23s.
Figure 4. |
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Aligning microseismic reflections for imaging |

2012-10-29