Simultaneous rupture on conjugate faults during the 2018 Anchorage, Alaska, intraslab earthquake (MW 7.1) inverted from strong-motion waveforms
Abstract An MW 7.1 ~ 50-km-deep intraslab earthquake within the Pacific/Yakutat slab underlying the North American Plate struck Anchorage, southern Alaska, on November 30, 2018. The ground-motion records very close to the source region of the Anchorage earthquake provide an important opportunity to...
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ftdatacite:10.6084/m9.figshare.c.5217189.v1 2023-05-15T18:44:38+02:00 Simultaneous rupture on conjugate faults during the 2018 Anchorage, Alaska, intraslab earthquake (MW 7.1) inverted from strong-motion waveforms Yujia Guo Miyakoshi, Ken Tsurugi, Masato 2020 https://dx.doi.org/10.6084/m9.figshare.c.5217189.v1 https://springernature.figshare.com/collections/Simultaneous_rupture_on_conjugate_faults_during_the_2018_Anchorage_Alaska_intraslab_earthquake_MW_7_1_inverted_from_strong-motion_waveforms/5217189/1 unknown figshare https://dx.doi.org/10.1186/s40623-020-01315-x https://dx.doi.org/10.6084/m9.figshare.c.5217189 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Geophysics Collection article 2020 ftdatacite https://doi.org/10.6084/m9.figshare.c.5217189.v1 https://doi.org/10.1186/s40623-020-01315-x https://doi.org/10.6084/m9.figshare.c.5217189 2021-11-05T12:55:41Z Abstract An MW 7.1 ~ 50-km-deep intraslab earthquake within the Pacific/Yakutat slab underlying the North American Plate struck Anchorage, southern Alaska, on November 30, 2018. The ground-motion records very close to the source region of the Anchorage earthquake provide an important opportunity to better understand the source characteristics of intraslab earthquakes in this subduction zone. We estimated the kinematic rupture process during this earthquake using a series of strong-motion waveform (0.05–0.4 Hz) inversions. Our inversions clearly indicate that the Anchorage earthquake was a rare intraslab event with simultaneous rupture on two conjugate faults, which are recognized sometimes for shallow crustal earthquakes but rarely for deep intraslab earthquakes. Interestingly, one of the conjugate faults had low aftershock productivity. This fault extends to great depth and may reflect a deep oceanic Moho or a local low-velocity and high-VP/VS zone within the oceanic mantle. Even though the Anchorage earthquake was a rare event due to the conjugate faults, we found that its kinematic source parameters such as the slip amplitude and large slip area nearly equal the global averages derived from source scaling relationships for intraslab earthquakes. Because the source parameters comparable to the global averages were also found for another large intraslab earthquake in the subducting Pacific/Yakutat slab, these source parameters are likely an important source characteristic common to this subduction zone. Article in Journal/Newspaper Yakutat Alaska DataCite Metadata Store (German National Library of Science and Technology) Anchorage Pacific |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
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unknown |
topic |
Geology FOS Earth and related environmental sciences Geophysics |
spellingShingle |
Geology FOS Earth and related environmental sciences Geophysics Yujia Guo Miyakoshi, Ken Tsurugi, Masato Simultaneous rupture on conjugate faults during the 2018 Anchorage, Alaska, intraslab earthquake (MW 7.1) inverted from strong-motion waveforms |
topic_facet |
Geology FOS Earth and related environmental sciences Geophysics |
description |
Abstract An MW 7.1 ~ 50-km-deep intraslab earthquake within the Pacific/Yakutat slab underlying the North American Plate struck Anchorage, southern Alaska, on November 30, 2018. The ground-motion records very close to the source region of the Anchorage earthquake provide an important opportunity to better understand the source characteristics of intraslab earthquakes in this subduction zone. We estimated the kinematic rupture process during this earthquake using a series of strong-motion waveform (0.05–0.4 Hz) inversions. Our inversions clearly indicate that the Anchorage earthquake was a rare intraslab event with simultaneous rupture on two conjugate faults, which are recognized sometimes for shallow crustal earthquakes but rarely for deep intraslab earthquakes. Interestingly, one of the conjugate faults had low aftershock productivity. This fault extends to great depth and may reflect a deep oceanic Moho or a local low-velocity and high-VP/VS zone within the oceanic mantle. Even though the Anchorage earthquake was a rare event due to the conjugate faults, we found that its kinematic source parameters such as the slip amplitude and large slip area nearly equal the global averages derived from source scaling relationships for intraslab earthquakes. Because the source parameters comparable to the global averages were also found for another large intraslab earthquake in the subducting Pacific/Yakutat slab, these source parameters are likely an important source characteristic common to this subduction zone. |
format |
Article in Journal/Newspaper |
author |
Yujia Guo Miyakoshi, Ken Tsurugi, Masato |
author_facet |
Yujia Guo Miyakoshi, Ken Tsurugi, Masato |
author_sort |
Yujia Guo |
title |
Simultaneous rupture on conjugate faults during the 2018 Anchorage, Alaska, intraslab earthquake (MW 7.1) inverted from strong-motion waveforms |
title_short |
Simultaneous rupture on conjugate faults during the 2018 Anchorage, Alaska, intraslab earthquake (MW 7.1) inverted from strong-motion waveforms |
title_full |
Simultaneous rupture on conjugate faults during the 2018 Anchorage, Alaska, intraslab earthquake (MW 7.1) inverted from strong-motion waveforms |
title_fullStr |
Simultaneous rupture on conjugate faults during the 2018 Anchorage, Alaska, intraslab earthquake (MW 7.1) inverted from strong-motion waveforms |
title_full_unstemmed |
Simultaneous rupture on conjugate faults during the 2018 Anchorage, Alaska, intraslab earthquake (MW 7.1) inverted from strong-motion waveforms |
title_sort |
simultaneous rupture on conjugate faults during the 2018 anchorage, alaska, intraslab earthquake (mw 7.1) inverted from strong-motion waveforms |
publisher |
figshare |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5217189.v1 https://springernature.figshare.com/collections/Simultaneous_rupture_on_conjugate_faults_during_the_2018_Anchorage_Alaska_intraslab_earthquake_MW_7_1_inverted_from_strong-motion_waveforms/5217189/1 |
geographic |
Anchorage Pacific |
geographic_facet |
Anchorage Pacific |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_relation |
https://dx.doi.org/10.1186/s40623-020-01315-x https://dx.doi.org/10.6084/m9.figshare.c.5217189 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5217189.v1 https://doi.org/10.1186/s40623-020-01315-x https://doi.org/10.6084/m9.figshare.c.5217189 |
_version_ |
1766235422287986688 |