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  The topography of the 660-km discontinuity beneath the Kuril-Kamchatka revealed by dense SdP observations and its geodynamic significance

Cui, Q., Zhou, Y., Liu, L., Gao, Y., Li, G., Zhang, S. (2023): The topography of the 660-km discontinuity beneath the Kuril-Kamchatka revealed by dense SdP observations and its geodynamic significance, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3706

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020837 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020837_1
Genre: Conference Paper

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Cui, Qinghui1, Author
Zhou, Yuanze1, Author
Liu, Lijun1, Author
Gao, Yuan1, Author
Li, Guohui1, Author
Zhang, Shengfeng1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The 660-km discontinuity (660) plays an important role in deep slab dynamics and mantle convection. Increasing numbers of seismic observations suggest controversial morphologies of the Pacific slab beneath the Kuril-Kamchatka located in the northwest rim of the Pacific Ocean, highlighting the poorly understood interaction of the slab and mantle discontinuities. Here we collect near-source SdP converted waves from a large dataset with several dense seismic networks and systematically image the new 660 topographic map around the Pacific slab beneath the Kuril-Kamchatka. We conduct detailed comparisons of the 660 depths and seismicity along some vertical cross sections. In comparison with the discontinuity depth in the IASP91 model, the 660 exhibits broad depressions up to 32–63 km with apparent downward deflections beneath the Kamchatka Peninsula and northern Kuril (region I), supporting slab penetration into the lower mantle; in contrast, the 660 depressions beneath southern Kuril (region II) are less than 21–28 km with a relatively flat configuration, implying a stagnating slab with possible hot entrained mantle materials and/or partial melts below it. We interpret these regional variations in the 660 topography as reflecting local low-temperature anomalies due to different slab morphologies associated with contrasting subduction modes. We suggest compound effects of pressure-driven mantle flow and trench retreat for inducing the inferred subduction mode change of the Pacific slab from region I to region II. Our results can provide direct seismic evidence for the 660 with slab-induced depressions and shed new light on the morphology and subduction dynamics of the northwestern Pacific slab.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Identifiers: DOI: 10.57757/IUGG23-3706
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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