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TitleAttenuation of ground-motion amplitudes from small-magnitude earthquakes in the Montney Play, northeastern British Columbia
AuthorBabaie Mahani, A; Kao, HORCID logo
SourceGeoscience BC Summary of activities 2017: energy; Geoscience BC, Report 2018-4, 2018 p. 15-21
LinksOnline - En ligne (pdf, 3.2 MB)
LinksGeoscience BC Summary of activities 2017: energy
Alt SeriesNatural Resources Canada, Contribution Series 20170243
PublisherGeoscience BC
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS93O/09; 93O/16; 93P/09; 93P/10; 93P/11; 93P/12; 93P/13; 93P/14; 93P/15; 93P/16; 94A/01; 94A/02; 94A/03; 94A/04; 94A/05; 94A/06; 94A/07; 94A/08; 94A/09; 94A/10; 94A/11; 94A/12; 94B/01; 94B/08; 94B/09
AreaSeptimus; Graham; Fort St. John; Dawson Creek
Lat/Long WENS-122.5000 -120.0000 56.7000 55.6000
Subjectsgeophysics; environmental geology; fossil fuels; seismology; earthquakes; seismicity; petroleum industry; hydrocarbon recovery; hydraulic fracturing; earthquake magnitudes; seismographs; seismic waves; attenuation; seismic velocities; strong motion seismology; amplitude spectra; seismic risk; earthquake risk; Montney Play; Canadian National Seismic Network; Infrastructures
Illustrationslocation maps; spectra; tables; graphs
ProgramEnvironmental Geoscience Shale Gas - induced seismicity
Released2018 01 01
The attenuation characteristics of ground motion from small-magnitude, potentially induced earthquakes in the Montney Play of northeast British Columbia are derived from a combined dataset consisting of waveforms recorded at both public and private seismograph stations. One unique advantage of this dataset is that it covers the close distance range of <45 km from epicenters in the magnitude range of 1.5¿3.8. Our results indicate that the ground motions are comparable between the Graham and Septimus areas with the exception of some frequencies at the magnitude bin of 2.5¿3.0. The geometrical spreading coefficients obtained with our combined dataset suggest higher decay in the amplitudes with distance than those obtained in Atkinson (2015). Furthermore, ground-motion amplitudes in the lower magnitude bin (M 1.5-2.5) attenuate faster than those with larger magnitudes (M =2.5). The difference between the geometrical spreading attenuation becomes minimal at higher frequencies (10 Hz), and this trend exists for PGV and PGA as well.
Summary(Plain Language Summary, not published)
We use a combined dataset consisting of seismic waveforms that were recorded at stations very close to injection sites (<45 km) in the Graham and Septimus areas of northeast British Columbia to investigate how the amplitude of seismic waves decays with distance (also known as seismic attenuation). We found that the attenuation is higher at this distance range than predicted by the previous model. Our results also suggest that the ground motion amplitude attenuates faster in the lower magnitude range (M 1.5-2.5) than the larger one (M=2.5).

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