Focal parameters of four Sverdrup Basin, Arctic Canada, earthquakes in November and December of 1972
Fault plane solutions are derived for the four largest magnitude (M s 5.1–5.7) earthquakes which occurred during the months of November and December, 1972, and which are part of the Byam Martin Channel earthquake swarm. The preferred fault plane solutions of all four have dextral strike-slip motion...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1977
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e77-215 http://www.nrcresearchpress.com/doi/pdf/10.1139/e77-215 |
id |
crcansciencepubl:10.1139/e77-215 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e77-215 2023-12-17T10:25:07+01:00 Focal parameters of four Sverdrup Basin, Arctic Canada, earthquakes in November and December of 1972 Hasegawa, H. S. 1977 http://dx.doi.org/10.1139/e77-215 http://www.nrcresearchpress.com/doi/pdf/10.1139/e77-215 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 14, issue 11, page 2481-2494 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1977 crcansciencepubl https://doi.org/10.1139/e77-215 2023-11-19T13:38:47Z Fault plane solutions are derived for the four largest magnitude (M s 5.1–5.7) earthquakes which occurred during the months of November and December, 1972, and which are part of the Byam Martin Channel earthquake swarm. The preferred fault plane solutions of all four have dextral strike-slip motion in a northeasterly direction on steeply dipping (approximately 80°) fault planes. For the December 27 earthquake, which has the largest M s (5.7), the fault motion is almost pure strike slip and the focal depth is shallow, being just below the base of the Sverdrup Basin. Forthe November 19, 21, and December 28 earthquakes which have smaller M s (5.1–5.2), the fault plane solutions have an appreciable dip-slip component (normal faulting) and the foci are at intermediate crustal depths. The two known active tectonic processes in the Arctic do not correlate with the fault plane solutions: active spreading at the Arctic mid-oceanic ridge (Gakkel or Nansen Ridge) cannot account for the orientation of the stress vectors from fault plane solutions; postglacial uplift predicts opposite dip-slip motion to what is derived from fault plane solutions. The proposed triggering mechanism for the earthquake swarm in the Byam Martin Channel is attributed to remanent stresses (predominantly horizontal and of unknown origin) acting upon a (heterogeneous) source region that is weakened by reactivated localized intrusions. Article in Journal/Newspaper Arctic sverdrup basin Canadian Science Publishing (via Crossref) Arctic Canada Byam Martin Channel ENVELOPE(-105.754,-105.754,76.252,76.252) Canadian Journal of Earth Sciences 14 11 2481 2494 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Hasegawa, H. S. Focal parameters of four Sverdrup Basin, Arctic Canada, earthquakes in November and December of 1972 |
topic_facet |
General Earth and Planetary Sciences |
description |
Fault plane solutions are derived for the four largest magnitude (M s 5.1–5.7) earthquakes which occurred during the months of November and December, 1972, and which are part of the Byam Martin Channel earthquake swarm. The preferred fault plane solutions of all four have dextral strike-slip motion in a northeasterly direction on steeply dipping (approximately 80°) fault planes. For the December 27 earthquake, which has the largest M s (5.7), the fault motion is almost pure strike slip and the focal depth is shallow, being just below the base of the Sverdrup Basin. Forthe November 19, 21, and December 28 earthquakes which have smaller M s (5.1–5.2), the fault plane solutions have an appreciable dip-slip component (normal faulting) and the foci are at intermediate crustal depths. The two known active tectonic processes in the Arctic do not correlate with the fault plane solutions: active spreading at the Arctic mid-oceanic ridge (Gakkel or Nansen Ridge) cannot account for the orientation of the stress vectors from fault plane solutions; postglacial uplift predicts opposite dip-slip motion to what is derived from fault plane solutions. The proposed triggering mechanism for the earthquake swarm in the Byam Martin Channel is attributed to remanent stresses (predominantly horizontal and of unknown origin) acting upon a (heterogeneous) source region that is weakened by reactivated localized intrusions. |
format |
Article in Journal/Newspaper |
author |
Hasegawa, H. S. |
author_facet |
Hasegawa, H. S. |
author_sort |
Hasegawa, H. S. |
title |
Focal parameters of four Sverdrup Basin, Arctic Canada, earthquakes in November and December of 1972 |
title_short |
Focal parameters of four Sverdrup Basin, Arctic Canada, earthquakes in November and December of 1972 |
title_full |
Focal parameters of four Sverdrup Basin, Arctic Canada, earthquakes in November and December of 1972 |
title_fullStr |
Focal parameters of four Sverdrup Basin, Arctic Canada, earthquakes in November and December of 1972 |
title_full_unstemmed |
Focal parameters of four Sverdrup Basin, Arctic Canada, earthquakes in November and December of 1972 |
title_sort |
focal parameters of four sverdrup basin, arctic canada, earthquakes in november and december of 1972 |
publisher |
Canadian Science Publishing |
publishDate |
1977 |
url |
http://dx.doi.org/10.1139/e77-215 http://www.nrcresearchpress.com/doi/pdf/10.1139/e77-215 |
long_lat |
ENVELOPE(-105.754,-105.754,76.252,76.252) |
geographic |
Arctic Canada Byam Martin Channel |
geographic_facet |
Arctic Canada Byam Martin Channel |
genre |
Arctic sverdrup basin |
genre_facet |
Arctic sverdrup basin |
op_source |
Canadian Journal of Earth Sciences volume 14, issue 11, page 2481-2494 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e77-215 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
14 |
container_issue |
11 |
container_start_page |
2481 |
op_container_end_page |
2494 |
_version_ |
1785573462698360832 |