000K  utf8
1100  $c2020
1500  eng
2050  urn:nbn:de:gbv:8:3-2021-00126-5
2051  10.1029/2020GC008993
3000  El-Sharkawy,  Amr
3010  Behrmann, Jan Hinrich
3010  Cristiano, Luigia
3010  Hamada, Mona
3010  Köhn, Daniel
3010  Lebedev, Sergei
3010  Meier, Thomas
3010  Weidle, Christian
4000  The Slab Puzzle of the Alpine-Mediterranean Region$dInsights from a new, High-Resolution, Shear-Wave Velocity Model of the Upper Mantle  [El-Sharkawy,  Amr]
4209  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.
4950  https://doi.org/10.1029/2020GC008993$xR$3Volltext$534
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00126-5$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/macau_mods_00000993
5051  550
5550  Mediterranean upper mantle
5550  Particle Swarm Optimization
5550  slab fragmentations
5550  slab gaps and tears
5550  surface wave tomography