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The Subduction Structure Beneath the New Britain Island Arc and the Adjacent Region from Double-Difference Tomography

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Abstract

We applied double-difference tomography to relocate seismic events and determine the lithospheric velocity structure beneath the New Britain Island arc and the South Bismarck Sea Basin, based on the local P wave arrival time dataset collected by the International Seismological Centre. Results of the seismic relocation and velocity inversion show that the subduction of Solomon Sea Plate along the New Britain Trench is spatially different above 150 km, and the subduction angle of the slab on the west side is higher than that on the east side. The relocated earthquakes also show that there are double seismic zones at the depths of about 30–90 km beneath the New Britain Island Arc. The velocity structure shows that the dehydration of the subducting slab caused the low-velocity anomalies in mantle wedge above the slab, which are associated with the magmatic activities around the New Guinea-New Britain Island arc. Moreover, it shows that there is another low-velocity anomaly zone beneath the Bismarck mid-oceanic ridge with spatial variation. Beneath the west of the Bismarck mid-oceanic ridge, the low-velocity anomaly is weakly connected to the subducted Solomon Sea slab. Conversely, the low-velocity anomaly beneath the Manus Sea Basin is highly intertwined to the subducting slab and its mantle wedge, indicating that the subduction of the Solomon Sea Plate might be a key deep dynamic factor that drives the spreading of the Manus Sea Basin and the separation of the Bismarck Plate.

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Acknowledgements

We thank Wessel & Smith (https://www.soest.hawaii.edu/gmt/) for the free use of GMT software to produce most figures in this work. We are grateful for the codes of double-difference tomography shared by Prof. Haijiang Zhang at the University of Science and Technology of China. This work was supported by the National Natural Science Foundation of China (Nos. 41906048 and 91858215).

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Authors and Affiliations

  1. Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China

    Hao Zhang, Wei Gong, Junhui Xing & Chong Xu

  2. Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266237, China

    Wei Gong & Junhui Xing

  3. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Chaoyang Li

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  1. Hao Zhang
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Correspondence to Chaoyang Li.

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Zhang, H., Gong, W., Xing, J. et al. The Subduction Structure Beneath the New Britain Island Arc and the Adjacent Region from Double-Difference Tomography. J. Ocean Univ. China 22, 107–118 (2023). https://doi.org/10.1007/s11802-023-5282-5

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  • DOI: https://doi.org/10.1007/s11802-023-5282-5

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