Subduction or delamination beneath the Apennines? Evidence from regional tomography

Koulakov, Ivan; Jakovlev, Andrey; Zabelina, I.; Roure, François; Cloetingh, S.A.P.L.; Khrepy, Sami El; Al-Arifi, Nassir

doi:10.5194/se-6-669-2015

Cited by 11 publications

(21 citation statements)

References 46 publications

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“…It also brought Corsica and Sardinia from the Iberian Peninsula to their current locations and resulted in the steeply dipping Tyrrhenian subduction zone (e.g. Spakman and Wortel, 2004;Koulakov et al, 2015). The central/eastern Mediterranean, on the other hand, consists mainly of old African oceanic lithosphere -with the exception of the Aegean Sea, where current subduction beneath the Hellenic arc and slab rollback towards the southwest and south have resulted in a young extensional basin (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

“…Most of the tectonic activity is in the north of the model domain, so in order to obtain a coverage that is as homogeneous as possible, events are initially selected manually from the Incorporated Research Institutions for Seismology (IRIS) Searchable Product Depository (SPUD) moment tensor catalogue (http: //ds.iris.edu/spud/momenttensor, last access: July 2019). Additional events are then obtained using automatic event selection from the Large-scale Seismic Inversion Framework package (LASIF; Krischer et al, 2015, http://lasif.net, last access: March 2020.…”

Section: Data Selectionmentioning

confidence: 99%

“…Classical ray tomography has been applied numerous times to study this area, both using body and surface waves (e.g. Spakman et al, 1988;Morelli, 1997, 2003;Amaru, 2007;Biryol et al, 2011;Koulakov et al, 2015;Portner et al, 2018;Snieder, 1988;Zielhuis and Nolet, 1994;Marone et al, 2004;Schivardi and Morelli, 2009;Salaün et al, 2012;Legendre et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Seismic waveform tomography of the central and eastern Mediterranean upper mantle

Blom

Gokhberg²,

Fichtner³

2020

Solid Earth

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Abstract. We present a seismic waveform tomography of the upper mantle beneath the central and eastern Mediterranean down to the mantle transition zone. Our methodology incorporates in a consistent manner the information from body and multimode surface waves, source effects, frequency dependence, wavefront healing, anisotropy and attenuation. This allows us to jointly image multiple parameters of the crust and upper mantle. Based on the data from ∼ 17 000 unique source–receiver pairs, gathered from 80 earthquakes, we image radially anisotropic S velocity, P velocity and density. We use a multi-scale approach in which the longest periods (100–150 s) are inverted first, broadening to a period band of 28–150 s. Thanks to a strategy that combines long-period signals and a separation of body and surface wave signals, we are able to image down to the mantle transition zone in most of the model domain. Our model shows considerable detail in especially the northern part of the domain, where data coverage is very dense, and displays a number of clear and coherent high-velocity structures across the domain that can be linked to episodes of current and past subduction. These include the Hellenic subduction zone, the Cyprus subduction zone and high-velocity anomalies beneath the Italian peninsula and the Dinarides. This model is able to explain data from new events that were not included in the inversion.

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Section: Geological Settingmentioning

confidence: 99%

Section: Data Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic waveform tomography of the central and eastern Mediterranean upper mantle

Blom

Gokhberg²,

Fichtner³

2020

Solid Earth

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“…It also brought Corsica and Sardinia from Iberia to their current locations and resulted in the steeply dipping Tyrrhenian subduction zone (e.g. Spakman and Wortel, 2004;Koulakov et al, 2015). The Central/Eastern Mediterranean, on the other hand, consists mainly of old African oceanic lithosphere -with the exception of the Aegean Sea, where current subduction beneath the Hellenic Arc and trench roll-back towards the south-west and south have resulted in a young extensional basin (e.g.…”

Section: Objective and Outlinementioning

confidence: 99%

Seismic waveform tomography of the Central and Eastern Mediterranean upper mantle

Blom¹,

Gokhberg²,

Fichtner³

2019

Preprint

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Abstract. We present a seismic waveform tomography of the upper mantle beneath the Central and Eastern Mediterranean down to the mantle transition zone. Our methodology incorporates in a consistent manner the information from body and multimode surface waves, source effects, frequency dependence, wavefront healing, anisotropy and attenuation. This allows us to jointly image multiple parameters of the crust and upper mantle. Based on the data from ~ 17 000 unique source-receiver pairs, gathered from 80 earthquakes, we image radially anisotropic S velocity, P velocity and density. We use a multi-scale approach in which the longest periods (100–150 s) are inverted first, broadening to a period band of 28–150 s. Thanks to a strategy that combines long-period signals and a separation of body and surface wave signals, we are able to image down to the transition zone in most of the model domain. Our model shows considerable detail in especially the northern part of the domain, where data coverage is very dense, and displays a number of clear and coherent high-velocity structures across the domain that can be linked to episodes of current and past subduction. These include the Hellenic subduction zone, the Cyprus subduction zone and high-velocity anomalies beneath the Italian peninsula and the Dinarides. This model is able to explain data from new events that were not included in the inversion.

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“…The inversion of the P-and S-waves arrival times were performed to obtain 3D velocity models and the locations of the events by using the nonlinear local earthquake tomography code LOTOS (Local Tomography Software) [42]. This code has been used to study various collision zones with similar data distribution geometries, such as the Tien Shan [43,44], the Caucasus [24], India [45], Calabria [46], and others.…”

Section: Methodsmentioning

confidence: 99%

Crustal Structure of the Eastern Anatolia Region (Turkey) Based on Seismic Tomography

2021

Self Cite

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Here, we investigated the crustal structure beneath eastern Anatolia, an area of high seismicity and critical significance for earthquake hazards in Turkey. The study was based on the local tomography method using data from earthquakes that occurred in the study area provided by the Turkiye Cumhuriyeti Ministry of Interior Disaster and Emergency Management Directorate Earthquake Department Directorate of Turkey. The dataset used for tomography included the travel times of 54,713 P-waves and 38,863 S-waves from 6355 seismic events. The distributions of the resulting seismic velocities (Vp, Vs) down to a depth of 60 km demonstrate significant anomalies associated with the major geologic and tectonic features of the region. The Arabian plate was revealed as a high-velocity anomaly, and the low-velocity patterns north of the Bitlis suture are mostly associated with eastern Anatolia. The upper crust of eastern Anatolia was associated with a ~10 km thick high-velocity anomaly; the lower crust is revealed as a wedge-shaped low-velocity anomaly. This kind of seismic structure under eastern Anatolia corresponded to the hypothesized existence of a lithospheric window beneath this collision zone, through which hot material of the asthenosphere rises. Thus, the presented results help to clarify the deep structure under eastern Anatolia.

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Subduction or delamination beneath the Apennines? Evidence from regional tomography

Cited by 11 publications

References 46 publications

Seismic waveform tomography of the central and eastern Mediterranean upper mantle

Seismic waveform tomography of the central and eastern Mediterranean upper mantle

Seismic waveform tomography of the Central and Eastern Mediterranean upper mantle

Crustal Structure of the Eastern Anatolia Region (Turkey) Based on Seismic Tomography

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