The topography of the 660-km discontinuity beneath the Kuril-Kamchatka revealed by dense SdP observations and its geodynamic significance ...
<!--!introduction!--> 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 Oc...
| Main Authors: | , , , , , |
|---|---|
| Format: | Conference Object |
| Language: | unknown |
| Published: |
GFZ German Research Centre for Geosciences
2023
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.57757/iugg23-3706 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020837 |
| Summary: | <!--!introduction!--> 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 ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
|---|