Uppermost Mantle Pn Velocity and Anisotropy Structures Beneath the Sakhalin–Kuril–Kamchatka Region

Author:

Lü Yan123ORCID,He Yuhui123,Li Juan123ORCID,Pei Shunping45ORCID,Chen Qi‐Fu123ORCID,Wu Qingju67ORCID

Affiliation:

1. Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

2. University of Chinese Academy of Sciences Beijing China

3. Heilongjiang Mohe Observatory of Geophysics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

4. School of Earth Sciences Yunnan University Kunming China

5. State Key Laboratory of Tibetan Plateau Earth System Environment and Resources Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China

6. Institute of Geophysics Chinese Earthquake Administration Beijing China

7. Key Laboratory of Earthquake Source Physics China Earthquake Administration Beijing China

Abstract

AbstractIn this study, we used the Pn tomography method to obtain detailed velocity and anisotropy structures of the uppermost mantle beneath Sakhalin–Kuril–Kamchatka region for improving the understanding of plate subduction, arc–arc collision, and volcanism. We found low Pn velocities beneath volcanoes and areas characterized by pronounced tectonic activity and high Pn velocities with strong anisotropy in the subducting plate. Low Pn velocity anomalies beneath southern Sakhalin connected the low‐velocity anomalies in the mantle and crust, indicating the ascent of fluid or melt, and may provide a magmatic source for the rear‐arc Rishiri volcano. In the absence of plate subduction, low‐velocity anomalies and north–south Pn anisotropy manifested beneath northern Kamchatka, revealing the lateral propagation of mantle flow beneath this northern region. We suggest that the eastern boundary of the slab window at the Kamchatka–Aleutian junction is likely to be located near the Komandorsky Islands.

Funder

National Natural Science Foundation of China

Publisher

American Geophysical Union (AGU)

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