Crustal Shear-Wave Velocity Models Retrieved from Rayleigh-Wave Dispersion Data in Northern Canada
Abstract Baffin Island is one of the several seismically active regions in the far north of Canada. In 1933, a strong earthquake withMw 7.3 occurred in the region. On 7 July 2009, a relatively strong earthquake with Mw 6.0 occurred in the same area. This earthquake was very well recorded by many mod...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1000.1279 2023-05-15T15:35:27+02:00 Crustal Shear-Wave Velocity Models Retrieved from Rayleigh-Wave Dispersion Data in Northern Canada Dariush Motazedian Shutian Ma The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1000.1279 http://bssa.geoscienceworld.org/content/ssabull/104/4/1976.full.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1000.1279 http://bssa.geoscienceworld.org/content/ssabull/104/4/1976.full.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://bssa.geoscienceworld.org/content/ssabull/104/4/1976.full.pdf text ftciteseerx 2016-10-23T00:18:30Z Abstract Baffin Island is one of the several seismically active regions in the far north of Canada. In 1933, a strong earthquake withMw 7.3 occurred in the region. On 7 July 2009, a relatively strong earthquake with Mw 6.0 occurred in the same area. This earthquake was very well recorded by many modern seismic stations. We sys-tematically organized the Rayleigh-wave displacement records, measured Rayleigh-wave dispersion data at 28 stations surrounding the epicenter, and retrieved the S-wave velocity models. We used a previous model for the Western Quebec seismic zone as the initial model in our analyses and found that the velocities of all models at the shallow depths (<15 km) were obviously slower than those of the initial model. In the middle crust, the velocities in most models were close to those of the initial model. In the directions of azimuths 171 ° ∼ 218 ° and 241°, the velocities in the middle crust were faster than those of the initial model. In the directions of 263 ° ∼ 279°, the veloc-ities in the middle crust were slower than those of the initial model. The slowest S-wave velocities in the top layers occurred in the directions of azimuths 90 ° and 218°. These findings indicate differences in the existing crustal structures. Text Baffin Island Baffin Unknown Baffin Island Canada |
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ftciteseerx |
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English |
description |
Abstract Baffin Island is one of the several seismically active regions in the far north of Canada. In 1933, a strong earthquake withMw 7.3 occurred in the region. On 7 July 2009, a relatively strong earthquake with Mw 6.0 occurred in the same area. This earthquake was very well recorded by many modern seismic stations. We sys-tematically organized the Rayleigh-wave displacement records, measured Rayleigh-wave dispersion data at 28 stations surrounding the epicenter, and retrieved the S-wave velocity models. We used a previous model for the Western Quebec seismic zone as the initial model in our analyses and found that the velocities of all models at the shallow depths (<15 km) were obviously slower than those of the initial model. In the middle crust, the velocities in most models were close to those of the initial model. In the directions of azimuths 171 ° ∼ 218 ° and 241°, the velocities in the middle crust were faster than those of the initial model. In the directions of 263 ° ∼ 279°, the veloc-ities in the middle crust were slower than those of the initial model. The slowest S-wave velocities in the top layers occurred in the directions of azimuths 90 ° and 218°. These findings indicate differences in the existing crustal structures. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Dariush Motazedian Shutian Ma |
spellingShingle |
Dariush Motazedian Shutian Ma Crustal Shear-Wave Velocity Models Retrieved from Rayleigh-Wave Dispersion Data in Northern Canada |
author_facet |
Dariush Motazedian Shutian Ma |
author_sort |
Dariush Motazedian |
title |
Crustal Shear-Wave Velocity Models Retrieved from Rayleigh-Wave Dispersion Data in Northern Canada |
title_short |
Crustal Shear-Wave Velocity Models Retrieved from Rayleigh-Wave Dispersion Data in Northern Canada |
title_full |
Crustal Shear-Wave Velocity Models Retrieved from Rayleigh-Wave Dispersion Data in Northern Canada |
title_fullStr |
Crustal Shear-Wave Velocity Models Retrieved from Rayleigh-Wave Dispersion Data in Northern Canada |
title_full_unstemmed |
Crustal Shear-Wave Velocity Models Retrieved from Rayleigh-Wave Dispersion Data in Northern Canada |
title_sort |
crustal shear-wave velocity models retrieved from rayleigh-wave dispersion data in northern canada |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1000.1279 http://bssa.geoscienceworld.org/content/ssabull/104/4/1976.full.pdf |
geographic |
Baffin Island Canada |
geographic_facet |
Baffin Island Canada |
genre |
Baffin Island Baffin |
genre_facet |
Baffin Island Baffin |
op_source |
http://bssa.geoscienceworld.org/content/ssabull/104/4/1976.full.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1000.1279 http://bssa.geoscienceworld.org/content/ssabull/104/4/1976.full.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766365781791080448 |