Seismic velocity structure of the crust and upper mantle beneath northwestern Canada


Using cross-correlation to measure the travel-times of Rayleigh waves generated by 110 global earthquakes with magnitude larger than 6.0 that occurred in 2004 and 2005, this research aims to map the variations of seismic velocity in the crust and mantle of northwestern Canada at six different periods (200 s, 100 s, 66.7 s, 50 s, 40 s, 33.3 s). Data used in this study are limited to lag times for interstation paths within 5° of azimuth difference with more than 10 measurements and standard deviation of less than 0.6.The study area is divided into 231 grid cells, each measuring 1° by 1°. Matrix inversion is used in order to determine the wave velocity in each grid cell. In addition to confirming the west-to-east transition from lower to higher velocity region found in a previous study (Ekström, 2011), results of this study also provide a higher-resolution velocity structure of the region.


Citra, Tiffany, "Seismic velocity structure of the crust and upper mantle beneath northwestern Canada" (2014). Summer Research Symposium. Brown Digital Repository. Brown University Library.



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