@Article{macau_mods_00000993, author = {El-Sharkawy, Amr and Meier, Thomas and Lebedev, Sergei and Behrmann, Jan Hinrich and Hamada, Mona and Cristiano, Luigia and Weidle, Christian and K{\"o}hn, Daniel}, title = {The Slab Puzzle of the Alpine-Mediterranean Region: Insights from a new, High-Resolution, Shear-Wave Velocity Model of the Upper Mantle}, journal = {Geochemistry, Geophysics, Geosystems}, year = {2020}, publisher = {American Geophysical Union (AGU)}, address = {Hoboken, NJ; Washington, DC}, keywords = {surface wave tomography; Particle Swarm Optimization; Mediterranean upper mantle; slab fragmentations; slab gaps and tears}, abstract = {Mediterranean tectonics since the Lower Cretaceous has been characterized by a multiphase subduction and collision history with temporally and spatially variable, small ‐ scale plate con fi gurations. A new shear wave velocity model of the Mediterranean upper mantle (MeRE2020), constrained by a very large set of over 200,000 broadband (8 -- 350 s), interstation, Rayleigh wave, phase velocity curves, illuminates the complex structure and fragmentation of the subducting slabs. Phase velocity maps computed using these measurements were inverted for depth ‐ dependent, shear wave velocities using a stochastic particle ‐ swarm ‐ optimization (PSO) algorithm. The resulting three ‐ dimensional (3 ‐ D) model makes possible an inventory of slab segments across the Mediterranean. Fourteen slab segments of 200 -- 800 km length along ‐ strike are identi fi ed. We distinguish three categories of subducted slabs: attached slabs reaching down to the bottom of the model; shallow slabs of shorter length in downdip direction, terminating shallower than 300 km depth; and detached slab segments. The location of slab segments are consistent with and validated by the intermediate ‐ depth seismicity, where it is present. The new high ‐ resolution tomography demonstrates the intricate relationships between slab fragmentation and the evolution of the relatively small and highly curved subduction zones and collisional orogens characteristic of the Mediterranean realm.}, issn = {1525-2027}, doi = {10.1029/2020GC008993}, url = {https://macau.uni-kiel.de/receive/macau_mods_00000993}, url = {https://doi.org/10.1029/2020GC008993}, file = {:https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002044/2020GC008993.pdf:PDF}, language = {en} }