Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume
Abstract We conduct waveform inversion to infer the three-dimensional (3-D) S-velocity structure in the lowermost 400 km of the mantle (the D′′ region) beneath the Northern Pacific region. Our dataset consists of about 20,000 transverse component broadband body-wave seismograms observed at North Ame...
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.3597902 https://figshare.com/collections/Waveform_inversion_for_3-D_S-velocity_structure_of_D_beneath_the_Northern_Pacific_possible_evidence_for_a_remnant_slab_and_a_passive_plume/3597902 |
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ftdatacite:10.6084/m9.figshare.c.3597902 2023-05-15T16:59:13+02:00 Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume Suzuki, Yuki Kawai, Kenji Geller, Robert Borgeaud, Anselme Konishi, Kensuke 2016 https://dx.doi.org/10.6084/m9.figshare.c.3597902 https://figshare.com/collections/Waveform_inversion_for_3-D_S-velocity_structure_of_D_beneath_the_Northern_Pacific_possible_evidence_for_a_remnant_slab_and_a_passive_plume/3597902 unknown Figshare https://dx.doi.org/10.1186/s40623-016-0576-0 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY 29999 Physical Sciences not elsewhere classified FOS Physical sciences Medicine Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 80699 Information Systems not elsewhere classified FOS Computer and information sciences Inorganic Chemistry FOS Chemical sciences Hematology 110309 Infectious Diseases FOS Health sciences Collection article 2016 ftdatacite https://doi.org/10.6084/m9.figshare.c.3597902 https://doi.org/10.1186/s40623-016-0576-0 2021-11-05T12:55:41Z Abstract We conduct waveform inversion to infer the three-dimensional (3-D) S-velocity structure in the lowermost 400 km of the mantle (the D′′ region) beneath the Northern Pacific region. Our dataset consists of about 20,000 transverse component broadband body-wave seismograms observed at North American stations for 131 intermediate and deep earthquakes which occurred beneath the western Pacific subduction region. We use S, ScS, and other phases that arrive between them. Resolution tests indicate that our methods and dataset can resolve the velocity structure in the target region with a horizontal scale of about 150 km and a vertical scale of about 50 km. The 3-D S-velocity model obtained in this study shows three prominent features: (1) prominent sheet-like lateral high-velocity anomalies up to $$\sim$$ ∼ 3% faster than the Preliminary Reference Earth Model (PREM) with a thickness of $$\sim$$ ∼ 200 km, whose lower boundary is $$\sim$$ ∼ 150 km above the core–mantle boundary (CMB). (2) A prominent low-velocity anomaly block located to the west of the Kamchatka peninsula, which is $$\sim$$ ∼ 2.5% slower than PREM, immediately above the CMB beneath the high-velocity anomalies. (3) A relatively thin ( $$\sim$$ ∼ 300 km) low-velocity structure continuous from the low-velocity anomaly “(2)” to at least 400 km above the CMB. We also detect a continuous low-velocity anomaly from the east of the Kamchatka peninsula at an altitude of 50 km above the CMB to the far east of the Kuril islands at an altitude of 400 km above the CMB. We interpret these features respectively as: (1) remnants of slab material where the bridgmanite to Mg-post-perovskite phase transition may have occurred within the slab, (2, 3) large amounts of hot and less dense materials beneath the cold Kula or Pacific slab remnants just above the CMB which ascend and form a passive plume upwelling at the edge of the slab remnants. Graphical Abstract . Article in Journal/Newspaper Kamchatka Kamchatka Peninsula DataCite Metadata Store (German National Library of Science and Technology) Pacific Kamchatka Peninsula ENVELOPE(160.000,160.000,56.000,56.000) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
29999 Physical Sciences not elsewhere classified FOS Physical sciences Medicine Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 80699 Information Systems not elsewhere classified FOS Computer and information sciences Inorganic Chemistry FOS Chemical sciences Hematology 110309 Infectious Diseases FOS Health sciences |
spellingShingle |
29999 Physical Sciences not elsewhere classified FOS Physical sciences Medicine Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 80699 Information Systems not elsewhere classified FOS Computer and information sciences Inorganic Chemistry FOS Chemical sciences Hematology 110309 Infectious Diseases FOS Health sciences Suzuki, Yuki Kawai, Kenji Geller, Robert Borgeaud, Anselme Konishi, Kensuke Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume |
topic_facet |
29999 Physical Sciences not elsewhere classified FOS Physical sciences Medicine Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 80699 Information Systems not elsewhere classified FOS Computer and information sciences Inorganic Chemistry FOS Chemical sciences Hematology 110309 Infectious Diseases FOS Health sciences |
description |
Abstract We conduct waveform inversion to infer the three-dimensional (3-D) S-velocity structure in the lowermost 400 km of the mantle (the D′′ region) beneath the Northern Pacific region. Our dataset consists of about 20,000 transverse component broadband body-wave seismograms observed at North American stations for 131 intermediate and deep earthquakes which occurred beneath the western Pacific subduction region. We use S, ScS, and other phases that arrive between them. Resolution tests indicate that our methods and dataset can resolve the velocity structure in the target region with a horizontal scale of about 150 km and a vertical scale of about 50 km. The 3-D S-velocity model obtained in this study shows three prominent features: (1) prominent sheet-like lateral high-velocity anomalies up to $$\sim$$ ∼ 3% faster than the Preliminary Reference Earth Model (PREM) with a thickness of $$\sim$$ ∼ 200 km, whose lower boundary is $$\sim$$ ∼ 150 km above the core–mantle boundary (CMB). (2) A prominent low-velocity anomaly block located to the west of the Kamchatka peninsula, which is $$\sim$$ ∼ 2.5% slower than PREM, immediately above the CMB beneath the high-velocity anomalies. (3) A relatively thin ( $$\sim$$ ∼ 300 km) low-velocity structure continuous from the low-velocity anomaly “(2)” to at least 400 km above the CMB. We also detect a continuous low-velocity anomaly from the east of the Kamchatka peninsula at an altitude of 50 km above the CMB to the far east of the Kuril islands at an altitude of 400 km above the CMB. We interpret these features respectively as: (1) remnants of slab material where the bridgmanite to Mg-post-perovskite phase transition may have occurred within the slab, (2, 3) large amounts of hot and less dense materials beneath the cold Kula or Pacific slab remnants just above the CMB which ascend and form a passive plume upwelling at the edge of the slab remnants. Graphical Abstract . |
format |
Article in Journal/Newspaper |
author |
Suzuki, Yuki Kawai, Kenji Geller, Robert Borgeaud, Anselme Konishi, Kensuke |
author_facet |
Suzuki, Yuki Kawai, Kenji Geller, Robert Borgeaud, Anselme Konishi, Kensuke |
author_sort |
Suzuki, Yuki |
title |
Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume |
title_short |
Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume |
title_full |
Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume |
title_fullStr |
Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume |
title_full_unstemmed |
Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume |
title_sort |
waveform inversion for 3-d s-velocity structure of d′′ beneath the northern pacific: possible evidence for a remnant slab and a passive plume |
publisher |
Figshare |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3597902 https://figshare.com/collections/Waveform_inversion_for_3-D_S-velocity_structure_of_D_beneath_the_Northern_Pacific_possible_evidence_for_a_remnant_slab_and_a_passive_plume/3597902 |
long_lat |
ENVELOPE(160.000,160.000,56.000,56.000) |
geographic |
Pacific Kamchatka Peninsula |
geographic_facet |
Pacific Kamchatka Peninsula |
genre |
Kamchatka Kamchatka Peninsula |
genre_facet |
Kamchatka Kamchatka Peninsula |
op_relation |
https://dx.doi.org/10.1186/s40623-016-0576-0 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3597902 https://doi.org/10.1186/s40623-016-0576-0 |
_version_ |
1766051428782047232 |