New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion
[1] Rayleigh wave phase and amplitude data are analyzed to provide new insight into the velocity structure of the upper mantle beneath the Slave craton, in the northwestern Canadian Shield. We invert for phase velocities at periods between 20 s–142 s (with greatest sensitivity at depths of 28–200 km...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.532.7949 2023-05-15T18:45:43+02:00 New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.7949 http://www-eaps.mit.edu/faculty/rondenay/pdf/Chen_etal_GRL_2007.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.7949 http://www-eaps.mit.edu/faculty/rondenay/pdf/Chen_etal_GRL_2007.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www-eaps.mit.edu/faculty/rondenay/pdf/Chen_etal_GRL_2007.pdf text ftciteseerx 2016-01-08T10:41:14Z [1] Rayleigh wave phase and amplitude data are analyzed to provide new insight into the velocity structure of the upper mantle beneath the Slave craton, in the northwestern Canadian Shield. We invert for phase velocities at periods between 20 s–142 s (with greatest sensitivity at depths of 28–200 km) using crossing ray paths from events recorded by the POLARIS broadband seismic network and the Yellowknife array. Phase velocities obtained for the Slave province are comparable to those from other cratons at shorter periods, but exceed the global average by 2 % at periods above 60 s, suggesting that the Slave craton may be an end member in terms of its high degree of mantle depletion. The one-dimensional inversion of phase velocities yields high upper-mantle S-wave velocities of 4.7 ± 0.2 km/s that persist to 220 ± 65 km depth and thus define the cratonic lithosphere. Azimuthal anisotropy is well resolved at all periods with a dominant fast direction of N59E ± 20, suggesting that upper mantle anisotropy beneath the Slave craton is influenced by both lithospheric fabric and sub- Text Yellowknife Unknown Yellowknife |
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[1] Rayleigh wave phase and amplitude data are analyzed to provide new insight into the velocity structure of the upper mantle beneath the Slave craton, in the northwestern Canadian Shield. We invert for phase velocities at periods between 20 s–142 s (with greatest sensitivity at depths of 28–200 km) using crossing ray paths from events recorded by the POLARIS broadband seismic network and the Yellowknife array. Phase velocities obtained for the Slave province are comparable to those from other cratons at shorter periods, but exceed the global average by 2 % at periods above 60 s, suggesting that the Slave craton may be an end member in terms of its high degree of mantle depletion. The one-dimensional inversion of phase velocities yields high upper-mantle S-wave velocities of 4.7 ± 0.2 km/s that persist to 220 ± 65 km depth and thus define the cratonic lithosphere. Azimuthal anisotropy is well resolved at all periods with a dominant fast direction of N59E ± 20, suggesting that upper mantle anisotropy beneath the Slave craton is influenced by both lithospheric fabric and sub- |
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title |
New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion |
spellingShingle |
New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion |
title_short |
New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion |
title_full |
New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion |
title_fullStr |
New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion |
title_full_unstemmed |
New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion |
title_sort |
new constraints on the upper mantle structure of the slave craton from rayleigh wave inversion |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.7949 http://www-eaps.mit.edu/faculty/rondenay/pdf/Chen_etal_GRL_2007.pdf |
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http://www-eaps.mit.edu/faculty/rondenay/pdf/Chen_etal_GRL_2007.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.7949 http://www-eaps.mit.edu/faculty/rondenay/pdf/Chen_etal_GRL_2007.pdf |
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1766236843920064512 |