Data Services Products: EMC-MeRE2020 The Slab Puzzle of the Alpine‐Mediterranean Region: Insights from a new, High‐Resolution, Shear‐Wave Velocity Model of the Upper Mantle

Summary

MeRE2020 is a high-resolution Shear‐wave velocity model of the Mediterranean upper mantle down to about 300 km, constrained by a very large set of over 200,000 broadband (8‐350 s), inter‐station, Rayleigh‐wave, phase‐velocity curves.

Description

Name MeRE2020
Title The Slab Puzzle of the Alpine‐Mediterranean Region: Insights from a new, High‐Resolution, Shear‐Wave Velocity Model of the Upper Mantle.
Type 3-D Surface Wave Tomography Earth Model
Sub Type S-wave velocity(km/s)
Year 2020
Data Revision r.0.0 (revision history)
 
Short Description   High-resolution Shear‐wave velocity model of the Mediterranean upper mantle down to about 300 km, constrained by a very large set of over 200,000 broadband (8‐350 s), inter‐station, Rayleigh‐wave, phase‐velocity curves. Phase‐velocity maps computed using these measurements were inverted for depth‐dependent, shear‐wave velocities using a new implementation of the stochastic particle‐swarm‐optimization algorithm (PSO). 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 identified. We distinguish three categories of subducted slabs: attached slabs reaching down to the bottom of the model; shallow slabs of shorter length in down‐dip direction, terminating shallower than 300 km depth; and detached slab segments. 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.
 
Authors: Amr El-Sharkawy:
Institute of Geosciences, Christian‐Albrechts‐Universität zu Kiel, Kiel, Germany
National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt

Thomas Meier, Christian Weidle, and Daniel Köhn:
Institute of Geosciences, Christian‐Albrechts‐Universität zu Kiel, Kiel, Germany

Sergei Lebedev:
School of Cosmic Physics, Geophysics Section, Dublin Institute for Advanced Studies, Dublin, Ireland

Jan Behrmann:
GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany

Mona Hamada:
National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt

Luigia Cristiano:
Deutsches GeoForschungsZentrum (GFZ), Potsdam, Germany
 
Previous Model None
Reference Model None
Model Download El-Sharkawy-etal-G3.2020-MeRE2020-Mediterranean-0.0.nc (see metadata ), is the netCDF file for the model
Model Homepage https://www.seismologie.ifg.uni-kiel.de/
Depth Coverage Upper mantle depths (~ 60 to ~ 300 km)
Area The Alpine-Mediterranean domain (latitudes: 30°N/50°N, longitudes: -10°E/45°E)
 
Data Set Description 200.000 fundamental-mode, Rayleigh-wave, inter-station, earthquake-based phase-velocity dispersion curves. More than 3900 earthquakes recorded by around 4500 publically available seismic station provided by IRIS and WebDC in the time range 1990-2015 are used in this study. This is combined with restricted data from about 25 stations of the Egyption National Seismological Network.
Supplemental Information

orizontal map views of the 3‐D shear wave velocity model
[El‐Sharkawy et al., 2020] Horizontal map views of the 3‐D shear wave velocity model (MeRE2020) at depths of 75 and 100 km. Shear wave velocity perturbations are shown with respect to a 1‐D depth‐dependent average velocity model (Figure 8). Aeg: Aegean Slab, Ant: Antalya Slab, CA: Central Alpine Slab, CAG: Central Apenninc Gap, Cl: Calabrian Slab, Di: Dinaridic Slab, EEC: East European Craton, EMOML: Eastern Mediterranean Oceanic Mantle Lithosphere, Gib: Gibraltar Slab, He: Hellenides Slab, NA: Northern Apenninic Slab, and WECML: Western European Continental Mantle Lithosphere.

Citations and DOIs

To cite the original work behind this Earth model:

  • El‐Sharkawy, A., Meier, T., Lebedev, S., Behrmann, J. H., Hamada, M., Cristiano, L., et al. (2020). The slab puzzle of the Alpine‐Mediterranean region: Insights from a new, high‐resolution, shear wave velocity model of the upper mantle. Geochemistry, Geophysics, Geosystems, 21, e2020GC008993. https://doi.org/10.1029/2020GC008993

To cite IRIS DMC Data Products effort:

  • Trabant, C., A. R. Hutko, M. Bahavar, R. Karstens, T. Ahern, and R. Aster (2012), Data Products at the IRIS DMC: Stepping Stones for Research and Other Applications, Seismological Research Letters, 83(5), 846–854, https://doi.org/10.1785/0220120032.

DOI for this EMC webpage: https://doi.org/10.17611/dp/emc.2020.meresvelsh.1

Credits

  • V.1.0 model provided by Amr El-Sharkawy.

Revision History

revision r.0.0: uploaded September 29, 2020.

Timeline

2020-09-29
online

Categories

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