Observations of SKS splitting beneath the Central and Southern External Dinarides in the Adria-Eurasia convergence zone

Subašić, Senad; Prevolnik, Snježan; Herak, Davorka; Herak, Marijan

doi:10.1016/j.tecto.2017.03.027

Cited by 13 publications

(17 citation statements)

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“…The SKS data show a more complex pattern around the Central Apennines, in correspondence to the slab window and the predicted mantle flow around it (Figure c). Recent SKS data show trench‐perpendicular directions along the Northern to Central Dinarides (Subašić et al, ). This pattern has been interpreted as the result of the mantle outflow from below the Adria plate toward the Pannonian Basin.…”

Section: Discussionmentioning

confidence: 99%

“…(c) Azimuthal anisotropy from shear wave splitting superimposed on uppermost mantle seismic tomography. The SKS splitting measurements compiled by Faccenna, Becker, Auer, et al () and augmented with data from Subašić et al (). The orientation of the segments representing the fast axes while the color coding refers to the delay time.…”

Section: The Adria Microplatementioning

confidence: 99%

“…Figure c shows a compilation of shear wave splitting (i.e., SKS anisotropy) measurements, illustrating a preferential trend of NW‐SE (i.e., trench parallel) beneath the Apennines belt which is turning to a more N‐S orientation beneath the Apennines foreland, and progressively turning to SE‐NW near the Dinarides (compilation based on Faccenna, Becker, Auer, et al, , from, e.g., Baccheschi et al, ; Civello & Margheriti, ; Lucente & Margheriti, ; Lucente et al, ; Margheriti et al, ; Plomerová et al, ; Subašić et al, ). To the south, beneath Sicily, the SKS pattern has been interpreted as a signal of toroidal flow around the Calabria slab (Civello & Margheriti, ; Faccenna et al, , , ; Jolivet et al, ), while at the northernmost part of the Apennines, the SKS pattern was interpreted as a coupled return flow pattern between the Alps and the Apennines (Jolivet et al, ; Salimbeni et al, ).…”

Section: The Adria Microplatementioning

confidence: 99%

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Subduction Zones Interaction Around the Adria Microplate and the Origin of the Apenninic Arc

2018

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The study of slab-slab interactions has come to the front of geodynamics researches to explain geological and geophysical observations from tectonically complex areas. Here we aim to better understand the geodynamics of the Central Mediterranean, where the Adria plate subducts on its two opposite sides. Additionally, the slab below the Central South Apennines has been progressively breaking off during the last 3 Myr. The role of a slab window in a single slab or in an outward dipping double-sided subduction system is addressed by analog models at the scale of the upper mantle, realized using glucose syrup and silicone putty, to model the interaction between the Earth's mantle and the lithosphere. Our results show that the presence of a slab window modifies the pattern of mantle circulation, as well as the trench geometry and kinematics. In particular, the opening of the slab window induces the formation of two arcs flanking the window, while the mantle flows through it and turns toward the arcs, creating a small-scale toroidal flow. The effect of a slab window is more pronounced on double subduction systems, as the outflow through the window is amplified, while internal deformation is induced in the plate by the opposite slab pull force. These experimental results suggest that the origin of the Apenninic and the Calabrian arcs is the result of the formation of a slab window, providing a new interpretation of the surface deformation and the SKS shear wave splitting pattern of the Adria microplate. Plain Language SummaryThe Adria microplate in the Central Mediterranean is an important part of the tectonic puzzle between the converging Africa and Eurasia plates. The heavy lithosphere sinks into the underlying mantle on two sides of the Adria plate, under the Apennines in the west and under the Dinarides in the east. During the most recent few millions of years, the lithosphere started to detach from the surface in the Central South Apennines while sinking into the mantle. This opened a slab window, an additional escape route for the mantle, which is squeezed by the two subducting lithospheres. We scaled down and simplified this setting in order to model and investigate the role of the dual subduction and the opening slab window in the evolution of the Central Mediterranean by means of analog models. Our results show that the two opposite subduction zones have a regional tectonics effect via the complex subduction-induced mantle circulation. Furthermore, the detaching lithosphere modifies the geometry of the subduction zone, which results in a double-arc geometry resembling the Northern Apennines and Calabria.

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Section: Discussionmentioning

confidence: 99%

Section: The Adria Microplatementioning

confidence: 99%

Section: The Adria Microplatementioning

confidence: 99%

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Subduction Zones Interaction Around the Adria Microplate and the Origin of the Apenninic Arc

2018

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“…Tomographic images available in the recent studies do not allow for a unique interpretation due to poor ray coverage. The recent SKS-splitting analyses of Subašić et al (2017) suggest that -unlike the situation in e.g. the Alps -the fast axis orientation in the mantle beneath the central and southern Dinarides is perpendicular to the mountain chain of the Dinarides.…”

Section: Introductionmentioning

confidence: 91%

“…2008Salimbeni at el. , 2013Subašić et al, 2017), attenuation measurements (e.g. Dasović et al, 2013Dasović et al, , 2015Majstorović et al, 2017), high-precision earthquake location (e.g.…”

Section: Scientific Aimsmentioning

confidence: 99%

Investigation of the Central Adriatic lithosphere structure with the AlpArray-CASE seismic experiment

et al. 2019

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The AlpArray Seismic Network: A Large-Scale European Experiment to Image the Alpine Orogen

et al. 2018

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The AlpArray programme is a multinational, European consortium to advance our understanding of orogenesis and its relationship to mantle dynamics, plate reorganizations, surface processes and seismic hazard in the Alps-Apennines-Carpathians-Dinarides orogenic system. The AlpArray Seismic Network has been deployed with contributions from 36 institutions from 11 countries to map physical properties of the lithosphere and asthenosphere in 3D and thus to obtain new, high-resolution geophysical images of structures from the surface down to the base of the mantle transition zone. With over 600 broadband stations Electronic supplementary material The online version of this article (https ://doi.org/10.1007/s1071 2-018-9472-4) contains supplementary material, which is available to authorized users. operated for 2 years, this seismic experiment is one of the largest simultaneously operated seismological networks in the academic domain, employing hexagonal coverage with station spacing at less than 52 km. This dense and regularly spaced experiment is made possible by the coordinated coeval deployment of temporary stations from numerous national pools, including ocean-bottom seismometers, which were funded by different national agencies. They combine with permanent networks, which also required the cooperation of many different operators. Together these stations ultimately fill coverage gaps. Following a short overview of previous large-scale seismological experiments in the Alpine region, we here present the goals, construction, deployment, characteristics and data management of the AlpArray Seismic Network, which will provide data that is expected to be unprecedented in quality to image the complex Alpine mountains at depth.

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Observations of SKS splitting beneath the Central and Southern External Dinarides in the Adria-Eurasia convergence zone

Cited by 13 publications

References 60 publications

Subduction Zones Interaction Around the Adria Microplate and the Origin of the Apenninic Arc

Subduction Zones Interaction Around the Adria Microplate and the Origin of the Apenninic Arc

Investigation of the Central Adriatic lithosphere structure with the AlpArray-CASE seismic experiment

The AlpArray Seismic Network: A Large-Scale European Experiment to Image the Alpine Orogen

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