Toroidal mantle flow beneath the NE termination of the Kuril–Kamchatka subduction zone from seismic anisotropy
International audience SUMMARY This study presents the findings of a splitting analysis conducted on core-refracted teleseismic shear waves (SKS, SKKS and PKS, called together as XKS) and local shear waves, obtained from a dense seismological network spanning the Kamchatka Peninsula. The objective o...
Published in: | Geophysical Journal International |
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2024
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Online Access: | https://hal.science/hal-04480322 https://hal.science/hal-04480322/document https://hal.science/hal-04480322/file/ggae047.pdf https://doi.org/10.1093/gji/ggae047 |
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ftinsu:oai:HAL:hal-04480322v1 2024-04-28T08:26:55+00:00 Toroidal mantle flow beneath the NE termination of the Kuril–Kamchatka subduction zone from seismic anisotropy Kaviani, Ayoub Rümpker, Georg Sens-Schönfelder, Christoph Komeazi, Abolfazl Shapiro, Nikolai Institut des Sciences de la Terre (ISTerre) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) 2024-04-02 https://hal.science/hal-04480322 https://hal.science/hal-04480322/document https://hal.science/hal-04480322/file/ggae047.pdf https://doi.org/10.1093/gji/ggae047 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggae047 hal-04480322 https://hal.science/hal-04480322 https://hal.science/hal-04480322/document https://hal.science/hal-04480322/file/ggae047.pdf doi:10.1093/gji/ggae047 info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.science/hal-04480322 Geophysical Journal International, 2024, 237 (1), pp.364-377. ⟨10.1093/gji/ggae047⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2024 ftinsu https://doi.org/10.1093/gji/ggae047 2024-04-05T00:27:06Z International audience SUMMARY This study presents the findings of a splitting analysis conducted on core-refracted teleseismic shear waves (SKS, SKKS and PKS, called together as XKS) and local shear waves, obtained from a dense seismological network spanning the Kamchatka Peninsula. The objective of the study is to examine the pattern of mantle flow beneath the study area through the investigation of seismic anisotropy. The peninsula is situated at the northeastern end of the Kuril–Kamchatka subduction zone, where the Kuril trench intersects with the western boundary of the Aleutian trench. The data set utilized in this study comprises waveform data from a dense network of seismic stations (99 broad-band and short-period stations for the local shear wave splitting analysis and 69 broad-band stations for the SKS splitting analysis). The seismograms were downloaded from publicly available data repositories including the IRIS Data Management Center and the GFZ Data Services (GEOFON program). The dense station coverage allows us to investigate the lateral variations in anisotropy, providing insights into the flow patterns within the mantle. The processing of the combined data sets of local shear wave and teleseismic XKS waves allowed us to partially decipher the source of anisotropy in the mantle. Small delay (splitting) times (∼0.35 s) observed from the local-S data suggest that anisotropy in the mantle wedge is relatively weak with lateral variations. Larger splitting times (∼1.1 s) observed for the XKS waves relative to local S suggest that the main part of splitting on the XKS waves occurs in the subslab mantle. On the other hand, the rotational pattern of seismic anisotropy observed by both the local S and XKS waves suggests the presence of a toroidal flow at the NE edge of the subducting slab, which affects both the mantle wedge and subslab mantle. For the regions away from the edge of the slab, the mantle flow seems to be governed mainly by the drag of the lithospheric plate over the underlying ... Article in Journal/Newspaper Kamchatka Kamchatka Peninsula Institut national des sciences de l'Univers: HAL-INSU Geophysical Journal International 237 1 364 377 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Kaviani, Ayoub Rümpker, Georg Sens-Schönfelder, Christoph Komeazi, Abolfazl Shapiro, Nikolai Toroidal mantle flow beneath the NE termination of the Kuril–Kamchatka subduction zone from seismic anisotropy |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience SUMMARY This study presents the findings of a splitting analysis conducted on core-refracted teleseismic shear waves (SKS, SKKS and PKS, called together as XKS) and local shear waves, obtained from a dense seismological network spanning the Kamchatka Peninsula. The objective of the study is to examine the pattern of mantle flow beneath the study area through the investigation of seismic anisotropy. The peninsula is situated at the northeastern end of the Kuril–Kamchatka subduction zone, where the Kuril trench intersects with the western boundary of the Aleutian trench. The data set utilized in this study comprises waveform data from a dense network of seismic stations (99 broad-band and short-period stations for the local shear wave splitting analysis and 69 broad-band stations for the SKS splitting analysis). The seismograms were downloaded from publicly available data repositories including the IRIS Data Management Center and the GFZ Data Services (GEOFON program). The dense station coverage allows us to investigate the lateral variations in anisotropy, providing insights into the flow patterns within the mantle. The processing of the combined data sets of local shear wave and teleseismic XKS waves allowed us to partially decipher the source of anisotropy in the mantle. Small delay (splitting) times (∼0.35 s) observed from the local-S data suggest that anisotropy in the mantle wedge is relatively weak with lateral variations. Larger splitting times (∼1.1 s) observed for the XKS waves relative to local S suggest that the main part of splitting on the XKS waves occurs in the subslab mantle. On the other hand, the rotational pattern of seismic anisotropy observed by both the local S and XKS waves suggests the presence of a toroidal flow at the NE edge of the subducting slab, which affects both the mantle wedge and subslab mantle. For the regions away from the edge of the slab, the mantle flow seems to be governed mainly by the drag of the lithospheric plate over the underlying ... |
author2 |
Institut des Sciences de la Terre (ISTerre) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Kaviani, Ayoub Rümpker, Georg Sens-Schönfelder, Christoph Komeazi, Abolfazl Shapiro, Nikolai |
author_facet |
Kaviani, Ayoub Rümpker, Georg Sens-Schönfelder, Christoph Komeazi, Abolfazl Shapiro, Nikolai |
author_sort |
Kaviani, Ayoub |
title |
Toroidal mantle flow beneath the NE termination of the Kuril–Kamchatka subduction zone from seismic anisotropy |
title_short |
Toroidal mantle flow beneath the NE termination of the Kuril–Kamchatka subduction zone from seismic anisotropy |
title_full |
Toroidal mantle flow beneath the NE termination of the Kuril–Kamchatka subduction zone from seismic anisotropy |
title_fullStr |
Toroidal mantle flow beneath the NE termination of the Kuril–Kamchatka subduction zone from seismic anisotropy |
title_full_unstemmed |
Toroidal mantle flow beneath the NE termination of the Kuril–Kamchatka subduction zone from seismic anisotropy |
title_sort |
toroidal mantle flow beneath the ne termination of the kuril–kamchatka subduction zone from seismic anisotropy |
publisher |
HAL CCSD |
publishDate |
2024 |
url |
https://hal.science/hal-04480322 https://hal.science/hal-04480322/document https://hal.science/hal-04480322/file/ggae047.pdf https://doi.org/10.1093/gji/ggae047 |
genre |
Kamchatka Kamchatka Peninsula |
genre_facet |
Kamchatka Kamchatka Peninsula |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.science/hal-04480322 Geophysical Journal International, 2024, 237 (1), pp.364-377. ⟨10.1093/gji/ggae047⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggae047 hal-04480322 https://hal.science/hal-04480322 https://hal.science/hal-04480322/document https://hal.science/hal-04480322/file/ggae047.pdf doi:10.1093/gji/ggae047 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggae047 |
container_title |
Geophysical Journal International |
container_volume |
237 |
container_issue |
1 |
container_start_page |
364 |
op_container_end_page |
377 |
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1797586105207357440 |