Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak
Three destructive earthquakes along the Alaska subduction zone sourced transoceanic tsunamis during the past 70 years. Since it is reasoned that past rupture areas might again source tsunamis in the future, we studied potential asperities and barriers in the subduction zone by examining Quaternary G...
Published in: | Geosphere |
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GSA (Geological Society of America)
2012
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Online Access: | https://oceanrep.geomar.de/id/eprint/14079/ https://oceanrep.geomar.de/id/eprint/14079/1/von_Huene_et_al.,_Alaska_margin_EQ_Normark_Vol.pdf http://geosphere.gsapubs.org/cgi/content/abstract/GES00715.1v1 https://doi.org/10.1130/GES00715.1 |
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ftoceanrep:oai:oceanrep.geomar.de:14079 2023-10-09T21:44:21+02:00 Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak von Huene, Roland Miller, John J. Weinrebe, Wilhelm 2012 text https://oceanrep.geomar.de/id/eprint/14079/ https://oceanrep.geomar.de/id/eprint/14079/1/von_Huene_et_al.,_Alaska_margin_EQ_Normark_Vol.pdf http://geosphere.gsapubs.org/cgi/content/abstract/GES00715.1v1 https://doi.org/10.1130/GES00715.1 en eng GSA (Geological Society of America) https://oceanrep.geomar.de/id/eprint/14079/1/von_Huene_et_al.,_Alaska_margin_EQ_Normark_Vol.pdf von Huene, R., Miller, J. J. and Weinrebe, W. (2012) Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak. Open Access Geosphere, 8 (3). pp. 628-644. DOI 10.1130/GES00715.1 <https://doi.org/10.1130/GES00715.1>. doi:10.1130/GES00715.1 info:eu-repo/semantics/openAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1130/GES00715.1 2023-09-24T23:21:40Z Three destructive earthquakes along the Alaska subduction zone sourced transoceanic tsunamis during the past 70 years. Since it is reasoned that past rupture areas might again source tsunamis in the future, we studied potential asperities and barriers in the subduction zone by examining Quaternary Gulf of Alaska plate history, geophysical data, and morphology. We relate the aftershock areas to subducting lower plate relief and dissimilar materials in the seismogenic zone in the 1964 Kodiak and adjacent 1938 Semidi Islands earthquake segments. In the 1946 Unimak earthquake segment, the exposed lower plate seafloor lacks major relief that might organize great earthquake rupture. However, the upper plate contains a deep transverse-trending basin and basement ridges associated with the Eocene continental Alaska convergent margin transition to the Aleutian island arc. These upper plate features are sufficiently large to have affected rupture propagation. In addition, massive slope failure in the Unimak area may explain the local 42-m-high 1946 tsunami runup. Although Quaternary geologic and tectonic processes included accretion to form a frontal prism, the study of seismic images, samples, and continental slope physiography shows a previous history of tectonic erosion. Implied asperities and barriers in the seismogenic zone could organize future great earthquake rupture. Article in Journal/Newspaper Aleutian Island Kodiak Alaska OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Gulf of Alaska Geosphere 8 3 628 644 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Three destructive earthquakes along the Alaska subduction zone sourced transoceanic tsunamis during the past 70 years. Since it is reasoned that past rupture areas might again source tsunamis in the future, we studied potential asperities and barriers in the subduction zone by examining Quaternary Gulf of Alaska plate history, geophysical data, and morphology. We relate the aftershock areas to subducting lower plate relief and dissimilar materials in the seismogenic zone in the 1964 Kodiak and adjacent 1938 Semidi Islands earthquake segments. In the 1946 Unimak earthquake segment, the exposed lower plate seafloor lacks major relief that might organize great earthquake rupture. However, the upper plate contains a deep transverse-trending basin and basement ridges associated with the Eocene continental Alaska convergent margin transition to the Aleutian island arc. These upper plate features are sufficiently large to have affected rupture propagation. In addition, massive slope failure in the Unimak area may explain the local 42-m-high 1946 tsunami runup. Although Quaternary geologic and tectonic processes included accretion to form a frontal prism, the study of seismic images, samples, and continental slope physiography shows a previous history of tectonic erosion. Implied asperities and barriers in the seismogenic zone could organize future great earthquake rupture. |
format |
Article in Journal/Newspaper |
author |
von Huene, Roland Miller, John J. Weinrebe, Wilhelm |
spellingShingle |
von Huene, Roland Miller, John J. Weinrebe, Wilhelm Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak |
author_facet |
von Huene, Roland Miller, John J. Weinrebe, Wilhelm |
author_sort |
von Huene, Roland |
title |
Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak |
title_short |
Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak |
title_full |
Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak |
title_fullStr |
Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak |
title_full_unstemmed |
Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak |
title_sort |
subducting plate geology in three great earthquake ruptures of the western alaska margin, kodiak to unimak |
publisher |
GSA (Geological Society of America) |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/14079/ https://oceanrep.geomar.de/id/eprint/14079/1/von_Huene_et_al.,_Alaska_margin_EQ_Normark_Vol.pdf http://geosphere.gsapubs.org/cgi/content/abstract/GES00715.1v1 https://doi.org/10.1130/GES00715.1 |
geographic |
Gulf of Alaska |
geographic_facet |
Gulf of Alaska |
genre |
Aleutian Island Kodiak Alaska |
genre_facet |
Aleutian Island Kodiak Alaska |
op_relation |
https://oceanrep.geomar.de/id/eprint/14079/1/von_Huene_et_al.,_Alaska_margin_EQ_Normark_Vol.pdf von Huene, R., Miller, J. J. and Weinrebe, W. (2012) Subducting plate geology in three great earthquake ruptures of the western Alaska margin, Kodiak to Unimak. Open Access Geosphere, 8 (3). pp. 628-644. DOI 10.1130/GES00715.1 <https://doi.org/10.1130/GES00715.1>. doi:10.1130/GES00715.1 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1130/GES00715.1 |
container_title |
Geosphere |
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8 |
container_issue |
3 |
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628 |
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644 |
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1779309505431994368 |