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A new model for the crust in the vicinity of Vancouver Island

University of British Columbia

Seismic explosion data obtained by the Dominion Observatory in the Vancouver Island region from 1953 to 1963 have been restudied by both the travel-time and the time-term methods. From the first method, a new four layer model crust was constructed: In addition to the sedimentary, a granitic, and basaltic layers, suggested by White (1962), an ultrabasic layer of more than 22 km in thickness and Vp = 7.1 km/sec was recognized. From the time-term method, this layer structure was supported and the possibility of a major structural feature running across the island is suggested by the faults on each side and the gravity anomaly extending between them. The Mohorovicic discontinuity was not observed. A possibility interpretation of the abnormal character is given, and the complementary gravity and geomagnetic depth sounding evidence presented.

Text

2011-07-15

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http://hdl.handle.net/2429/36016

Geophysics

University of British Columbia

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