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- Title
Point Estimates of Crustal Thickness Using Receiver Function Stacking.
- Authors
Hobbs, Tiegan; Darbyshire, Fiona A.
- Abstract
Introduction: Through receiver function analysis, this study inquires into some of the most basic properties of the crust below Southern and Central Quebec. Methods: This is accomplished, using receiver function technique, by stacking waveforms from 277 teleseismic events magnitude 6.0 and larger to find the delay in arrival time for several phases of the P-wave coda, relative to the initial P-wave arrival. This information is used to establish a linear relationship between thickness and P- to S-wave velocity ratio, each of which is stacked for a given station to identify a best-fit estimate for depth to the Moho and Vp/Vs ratio. To determine their accuracy these results are compared with previous seismic studies, as well as synthetically generated receiver function P-wave arrivals based on simple 1D crustal models. Thickness calculations for the crust varied from 28 to 48 km; variation which was most likely the result of either complicated 3D structures or a shortage of available high-magnitude events for some stations. Most of the results fell within appropriate windows outlined by studies like LITHOPROBE. Discussion: Given that the 9 broadband stations used in this study compose an area from the Superior Province, Grenville Province and a selection of their subprovinces and intrusions, reliable evaluations of the crustal thicknesses below these seismic stations have broad relevance in understanding the crustal structure below Quebec.
- Subjects
ABITIBI (Quebec); QUEBEC (Province); CANADA; SEISMOLOGY; CONTINENTAL crust; SEISMOGRAMS; SEISMIC wave velocity; SEISMIC response
- Publication
McGill Science Undergraduate Research Journal, 2012, Vol 7, Issue 1, p21
- ISSN
1718-0775
- Publication type
Article
- DOI
10.26443/msurj.v7i1.99