UNUSUAL EARTHQUAKES IN THE GULF OF ALASKA AND FRAGMENTATION OF THE PACIFIC PLATE
Abstract. Two recent M s 7.6 strike-slip which ruptured in an M s 7.9 event in 1958. West of earthquakes in the northern Gulf of Alaska rup- longitude 144øW, motion is accommodated by under-tured a composite 250-km-long north-striking zone thrusting and subduction along the Aleutian mega-in the Paci...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.554.9326 2023-05-15T18:44:38+02:00 UNUSUAL EARTHQUAKES IN THE GULF OF ALASKA AND FRAGMENTATION OF THE PACIFIC PLATE J. C. Lahr C. D. Stephens D. H. Christensen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.9326 http://www.iris.edu/seismo/quakes/1987-1988gulfofalaska/Lahr_et_al_1988.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.9326 http://www.iris.edu/seismo/quakes/1987-1988gulfofalaska/Lahr_et_al_1988.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.iris.edu/seismo/quakes/1987-1988gulfofalaska/Lahr_et_al_1988.pdf text ftciteseerx 2016-01-08T11:44:09Z Abstract. Two recent M s 7.6 strike-slip which ruptured in an M s 7.9 event in 1958. West of earthquakes in the northern Gulf of Alaska rup- longitude 144øW, motion is accommodated by under-tured a composite 250-km-long north-striking zone thrusting and subduction along the Aleutian mega-in the Pacific plate. These shocks are attributed thrust, which last slipped in the 1964 earthquake. to a combination of enhanced tensional stress in In the intervening region, which has been iden-the Pacific plate seaward of and following the tified as a seismic gap (Tobin and Sykes, 1968; great (M w 9.2) Alaska earthquake of 1964, and Kelleher, 1970; Sykes, 1971), the tectonics are compressional stress resulting from collision of complicated by the collision of the Yakutat ter-the Yakutat terrane with North America. The rane, which moves with nearly the Pacific plate occurrence of these shocks reflects fragmentation velocity (Plafker et al., 1978; Lahr and Plafker, of the northeast corner of the Pacific plate, 1980; Perez and Jacob, 1980; Bruns, 1983; Plafker, possibly the initial step in establishing a new 1987). Although no great earthquake has occurred plate boundary seaward of the current boundary. within the Yakataga seismic gap since the turn of the century (McCann et al., 1980), two sequences Introduction with low-angle thrusting have occurred there since Text Yakutat Alaska Unknown Bruns ENVELOPE(-64.383,-64.383,-84.483,-84.483) Gulf of Alaska McCann ENVELOPE(-77.617,-77.617,-73.567,-73.567) Pacific Perez ENVELOPE(-69.117,-69.117,-68.517,-68.517) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Abstract. Two recent M s 7.6 strike-slip which ruptured in an M s 7.9 event in 1958. West of earthquakes in the northern Gulf of Alaska rup- longitude 144øW, motion is accommodated by under-tured a composite 250-km-long north-striking zone thrusting and subduction along the Aleutian mega-in the Pacific plate. These shocks are attributed thrust, which last slipped in the 1964 earthquake. to a combination of enhanced tensional stress in In the intervening region, which has been iden-the Pacific plate seaward of and following the tified as a seismic gap (Tobin and Sykes, 1968; great (M w 9.2) Alaska earthquake of 1964, and Kelleher, 1970; Sykes, 1971), the tectonics are compressional stress resulting from collision of complicated by the collision of the Yakutat ter-the Yakutat terrane with North America. The rane, which moves with nearly the Pacific plate occurrence of these shocks reflects fragmentation velocity (Plafker et al., 1978; Lahr and Plafker, of the northeast corner of the Pacific plate, 1980; Perez and Jacob, 1980; Bruns, 1983; Plafker, possibly the initial step in establishing a new 1987). Although no great earthquake has occurred plate boundary seaward of the current boundary. within the Yakataga seismic gap since the turn of the century (McCann et al., 1980), two sequences Introduction with low-angle thrusting have occurred there since |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
J. C. Lahr C. D. Stephens D. H. Christensen |
spellingShingle |
J. C. Lahr C. D. Stephens D. H. Christensen UNUSUAL EARTHQUAKES IN THE GULF OF ALASKA AND FRAGMENTATION OF THE PACIFIC PLATE |
author_facet |
J. C. Lahr C. D. Stephens D. H. Christensen |
author_sort |
J. C. Lahr |
title |
UNUSUAL EARTHQUAKES IN THE GULF OF ALASKA AND FRAGMENTATION OF THE PACIFIC PLATE |
title_short |
UNUSUAL EARTHQUAKES IN THE GULF OF ALASKA AND FRAGMENTATION OF THE PACIFIC PLATE |
title_full |
UNUSUAL EARTHQUAKES IN THE GULF OF ALASKA AND FRAGMENTATION OF THE PACIFIC PLATE |
title_fullStr |
UNUSUAL EARTHQUAKES IN THE GULF OF ALASKA AND FRAGMENTATION OF THE PACIFIC PLATE |
title_full_unstemmed |
UNUSUAL EARTHQUAKES IN THE GULF OF ALASKA AND FRAGMENTATION OF THE PACIFIC PLATE |
title_sort |
unusual earthquakes in the gulf of alaska and fragmentation of the pacific plate |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.9326 http://www.iris.edu/seismo/quakes/1987-1988gulfofalaska/Lahr_et_al_1988.pdf |
long_lat |
ENVELOPE(-64.383,-64.383,-84.483,-84.483) ENVELOPE(-77.617,-77.617,-73.567,-73.567) ENVELOPE(-69.117,-69.117,-68.517,-68.517) |
geographic |
Bruns Gulf of Alaska McCann Pacific Perez |
geographic_facet |
Bruns Gulf of Alaska McCann Pacific Perez |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_source |
http://www.iris.edu/seismo/quakes/1987-1988gulfofalaska/Lahr_et_al_1988.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.9326 http://www.iris.edu/seismo/quakes/1987-1988gulfofalaska/Lahr_et_al_1988.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766235416869994496 |