―136―Daniel Pastor-Galán (Creative Interdisciplinary Research Division/Advanced basic science) My2023 research focused on the Philippine Sea Plate tectonics to understand subduction initiation processes and the paleogeography of the Paleo-Pacific ocean. Previous studies interpreted clockwise rotations of up to 90° since the Eocene. Our studies demonstrate that with currently available data, rotations of the PSP may be permitted, but are not required. Plate motion is currently better reconstructed from geological constraints contained in circum-PSP orogenic belts. In addition, I have also worked on modeling subduction initiation, a pivotal process in plate tectonics. Models of subduction initiation include the collapse of passive margins, oceanic transform faults, inversion of oceanic core complexes, and ridge failure but have ignored the potential effects of continental crust relicts within the oceanic crust. I have explored the role of microcontinents on subduction initiation through two-dimensional thermo-mechanical numerical modeling. These numerical models add a new hypothetical scenario for subduction initiation, especially for those places where a young and buoyant plate subducts beneath an older and denser oceanic plate. The modeling results can help resolve the contested subduction initiation settings in the West Philippine Basin part of the Philippine Sea plate. References -van de Lagemaat, S.H., Pastor-Galán, D., Zanderink, B.B., Villareal, M.J., Jenson, J.W., Dekkers, M.J. and van Hinsbergen, D.J., (2023). A critical reappraisal of paleomagnetic evidence for Philippine Sea Plate rotation. Tectonophysics, 863, p.230010. -Zhu, M., Yan, Z., Pastor-Galán, D., Chen, L., Miao, L., Zhang, F., Li, S. and Yang, S., (2023). Do microcontinents nucleate subduction initiation? Geology, 51 (7): 668–672 2023□□□□□□□□□□□□□□□ (topological defect) □□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□ □□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□AOBA□□□□□□□□□□□□□□ [2]□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□NANOGrav□□□□□□□□□□□□□□□□□□ [1]□ □□□□□[1] Naoya Kitajima, Kazunori Nakayama, Physics Letters B 846 138213-138213 [2] Naoya Kitajima, Kazunori Nakayama, Journal of High Energy Physics 2023(8) Simulation of the early universe / □□□□□□□□□□□□□ □□□□□□□□□□□□□□□□□□□□□□ Tectonics of the Panthalassa Pacific system
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