A Refraction Survey across the Canadian Cordillera at 54 °N

摘要: Record sections from partially reversed refraction lines in northern British Columbia show that the amplitudes of upper mantle arrivals vary smoothly with distance, while pattern crustal arrival is not smooth. Normalization seismograms to remove effects varying shot size and instrument response Pn are largely site-independent.Models derived ray theory indicate a crust which thins about 40 km Omineca Crystalline Belt 25 km Insular Trough. The average velocity 8.06 km s−1, 6.4 km s−1. secondary energy indicates models greatly simplified.A time–term profile between Coast Mountains suggests Mohorovicic transition characterized by two significant topographic wavelengths. shorter (200 km) wavelength correlates roughly Cordilleran structural elements Wheeler Gabrielse (1972). larger (800 km) wavelen...