GCB - Nadine Igonin - University of Calgary - Bilinear magnitude distributions from induced seismicity in Fox Creek, Alberta
Nadine Igonin - University of Calgary
Room G8, School of Earth Sciences, Wills Memorial Building
We are pleased to welcome Nadine Igonin from the University of Calgary who will be delivering the GCB seminar:-
Title: Bilinear magnitude distributions from induced seismicity in Fox Creek, Alberta
Induced seismicity due to hydraulic fracturing is an increasing concern in Alberta, with events over M 4.0 being recorded. The University of Calgary acquired a passive seismic dataset in Fox Creek, Alberta during a 4-well hydraulic fracturing operation with a dense surface array, recording over 2,000 events over M 0, with fifteen events over M 1.5 and as high as M 3.2. The results show a bilinear magnitude distribution with a change in slope from b ~ 1.6 for M < 1.0 to b ~ 0.6 for M > 1.0. Analysis of distinct clusters of events shows that the bilinear nature arises from superposition of distributions with spatially varying b-values. In addition, based on statistical tests, the presence of a few moderate events (M > 2.0) causes the distribution to deviate significantly from a power law. We invoke the characteristic earthquake hypothesis as a potential explanation for this unusual manifestation of induced seismicity.
All staff and students welcome.
For further information please contact Dr. David Schlaphorst.