Interpretation of a seismic refraction profile from the Richardson Mountains, Yukon territory
In March of 1987, the Geologic Survey of Canada conducted a major seismic refraction experiment in the Mackenzie Delta-Southern Beaufort Sea-Northern Yukon area. This study involves the analysis of a portion of the resulting data set. A 2D velocity profile through the Richardson Mountains of the nor...
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ftunivbritcolcir:oai:circle.library.ubc.ca:2429/29692 2023-05-15T15:40:38+02:00 Interpretation of a seismic refraction profile from the Richardson Mountains, Yukon territory O'Brien, Simon 1990 http://hdl.handle.net/2429/29692 eng eng University of British Columbia For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. Faults (Geology) -- Yukon Territory -- Richardson Mountains Seismic refraction method Text Thesis/Dissertation 1990 ftunivbritcolcir 2019-10-15T18:00:39Z In March of 1987, the Geologic Survey of Canada conducted a major seismic refraction experiment in the Mackenzie Delta-Southern Beaufort Sea-Northern Yukon area. This study involves the analysis of a portion of the resulting data set. A 2D velocity profile through the Richardson Mountains of the northern Yukon has been constructed using raytracing to model the travel-times and amplitudes. The line is approximately 320 km long, running from a shotpointon the Eagle Plains in the south to one 50 km offshore in Mackenzie Bay to the north, with an average receiver spacing of 3.5 km. An additional shotpoint is located at Shingle Point, on the shore of Mackenzie Bay. A series of four sedimentary basins separated by major structural highs produces a complex basement structure. Two distinct upper crustal layers were modelled, a 5.95 km/s layer overlying a 6.3 km/s layer, as well as a lower crustal layer with a velocity of 7.25 km/s. Crustal velocity gradients are low (≤ 0.005 s⁻¹). The 6.3 km/s layer pinches out beneath the Beaufort-Mackenzie Basin in the north, accompanied by a thinning of the lower crust from a thickness of 20 km in the south to less than 10 km beneath MB. This results in the crust as a whole thinning from a thickness of 50 km under the Richardson Mountains to only 40 km under the Beaufort-Mackenzie Basin. The velocity of the upper mantle is 7.95 km/s. The modelling of shear wave arrivals indicate Poisson's ratios of 0.23 ±0.02 in the upper crust and 0.25 + 0.02 in the lower crust. Science, Faculty of Earth, Ocean and Atmospheric Sciences, Department of Graduate Thesis Beaufort Sea Eagle Plains Mackenzie Basin Mackenzie Bay Mackenzie Delta Yukon University of British Columbia: cIRcle - UBC's Information Repository Canada Eagle Plains ENVELOPE(-136.741,-136.741,66.372,66.372) Mackenzie Bay ENVELOPE(70.583,70.583,-68.617,-68.617) Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Richardson Mountains ENVELOPE(-136.171,-136.171,67.000,67.000) Yukon |
institution |
Open Polar |
collection |
University of British Columbia: cIRcle - UBC's Information Repository |
op_collection_id |
ftunivbritcolcir |
language |
English |
topic |
Faults (Geology) -- Yukon Territory -- Richardson Mountains Seismic refraction method |
spellingShingle |
Faults (Geology) -- Yukon Territory -- Richardson Mountains Seismic refraction method O'Brien, Simon Interpretation of a seismic refraction profile from the Richardson Mountains, Yukon territory |
topic_facet |
Faults (Geology) -- Yukon Territory -- Richardson Mountains Seismic refraction method |
description |
In March of 1987, the Geologic Survey of Canada conducted a major seismic refraction experiment in the Mackenzie Delta-Southern Beaufort Sea-Northern Yukon area. This study involves the analysis of a portion of the resulting data set. A 2D velocity profile through the Richardson Mountains of the northern Yukon has been constructed using raytracing to model the travel-times and amplitudes. The line is approximately 320 km long, running from a shotpointon the Eagle Plains in the south to one 50 km offshore in Mackenzie Bay to the north, with an average receiver spacing of 3.5 km. An additional shotpoint is located at Shingle Point, on the shore of Mackenzie Bay. A series of four sedimentary basins separated by major structural highs produces a complex basement structure. Two distinct upper crustal layers were modelled, a 5.95 km/s layer overlying a 6.3 km/s layer, as well as a lower crustal layer with a velocity of 7.25 km/s. Crustal velocity gradients are low (≤ 0.005 s⁻¹). The 6.3 km/s layer pinches out beneath the Beaufort-Mackenzie Basin in the north, accompanied by a thinning of the lower crust from a thickness of 20 km in the south to less than 10 km beneath MB. This results in the crust as a whole thinning from a thickness of 50 km under the Richardson Mountains to only 40 km under the Beaufort-Mackenzie Basin. The velocity of the upper mantle is 7.95 km/s. The modelling of shear wave arrivals indicate Poisson's ratios of 0.23 ±0.02 in the upper crust and 0.25 + 0.02 in the lower crust. Science, Faculty of Earth, Ocean and Atmospheric Sciences, Department of Graduate |
format |
Thesis |
author |
O'Brien, Simon |
author_facet |
O'Brien, Simon |
author_sort |
O'Brien, Simon |
title |
Interpretation of a seismic refraction profile from the Richardson Mountains, Yukon territory |
title_short |
Interpretation of a seismic refraction profile from the Richardson Mountains, Yukon territory |
title_full |
Interpretation of a seismic refraction profile from the Richardson Mountains, Yukon territory |
title_fullStr |
Interpretation of a seismic refraction profile from the Richardson Mountains, Yukon territory |
title_full_unstemmed |
Interpretation of a seismic refraction profile from the Richardson Mountains, Yukon territory |
title_sort |
interpretation of a seismic refraction profile from the richardson mountains, yukon territory |
publisher |
University of British Columbia |
publishDate |
1990 |
url |
http://hdl.handle.net/2429/29692 |
long_lat |
ENVELOPE(-136.741,-136.741,66.372,66.372) ENVELOPE(70.583,70.583,-68.617,-68.617) ENVELOPE(-136.672,-136.672,68.833,68.833) ENVELOPE(-136.171,-136.171,67.000,67.000) |
geographic |
Canada Eagle Plains Mackenzie Bay Mackenzie Delta Richardson Mountains Yukon |
geographic_facet |
Canada Eagle Plains Mackenzie Bay Mackenzie Delta Richardson Mountains Yukon |
genre |
Beaufort Sea Eagle Plains Mackenzie Basin Mackenzie Bay Mackenzie Delta Yukon |
genre_facet |
Beaufort Sea Eagle Plains Mackenzie Basin Mackenzie Bay Mackenzie Delta Yukon |
op_rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
_version_ |
1766373325079052288 |