Crustal structure of the northern Dinarides and southwestern part of the Pannonian basin inferred from local earthquake tomography

Kapuralić, Josipa; Šumanovac, Franjo; Markušić, Snježana

doi:10.1007/s00015-018-0335-2

Cited by 12 publications

(31 citation statements)

References 45 publications

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“…Characterizing the depth to the Mohorovičić discontinuity is essential in reconstructing the tectonic past of an area. Compared to the close neighbors, such as the Alps and the Apennines, the Dinarides are comparatively poorly researched and only a handful of seismological studies have only recently started to deal with deep crust and transition to mantle here using data from rapidly growing local seismic networks (e.g., Stipčević et al, ; Šumanovac & Dudjak, ; Šumanovac et al, ; Subašić et al, ; Belinić et al, ; Kapuralić et al, ). In particular, no concentrated effort has been made to update the only map of the Moho topography in the greater Dinarides area by Aljinović et al () and Skoko et al () (see below) published over 32 years ago.…”

Section: Introductionmentioning

confidence: 99%

Crustal Thickness Beneath the Dinarides and Surrounding Areas From Receiver Functions

et al. 2020

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Knowledge about the crustal thickness is one of the key elements in the reconstruction of the regional tectonic history. The Dinaric mountain belt is one of the most enigmatic segments of the Alpine-Mediterranean collision zone, characterized by large variations in crustal thickness and not studied sufficiently. We present a new Moho depth map for the wider Dinarides region which was created using teleseismic earthquake recordings from 87 permanent and temporary seismic stations in the region. Teleseismic data were analyzed using the receiver function method to extract converted P to S waves. The resulting Moho topography fits well within a structural framework comprising a thicker crust under the Dinarides, which gradually becomes thinner toward the Pannonian and Adriatic domains. The profiles crossing the northwestern Dinarides are marked by a relatively sharp decrease in crustal thickness north of the main thrust front. This transition is followed by significant crustal thinning toward the Pannonian basin. The Mohorovičić discontinuity lies the deepest in the central and southern Dinarides, at depths of over 55 km. Here similarly to the northwestern segment we observe a jump in the crustal thickness when transitioning toward the Internal Dinarides, which hints at possible underthrusting (or subduction) of the Adria plate in this region. Moho depths in the transition zone toward the Pannonian basin and in the Pannonian basin proper vary between 25 and 35 km. In the Adriatic domain, we find crustal thickness ranging from 30 km to more than 45 km around the Central Adriatic islands.

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Section: Introductionmentioning

confidence: 99%

Crustal Thickness Beneath the Dinarides and Surrounding Areas From Receiver Functions

et al. 2020

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“…6) shows that the upper crust is adequately sampled. This was made possible by the modernization of the SNRS (Jesenko & Živčić, 2018) and with the deployment of additional seismic stations in Croatia within the VELEBIT project and the AlpArray project (Molinari et al, 2016). Considering the results of the 485 stability tests and the convergence of the final regional models (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Crustal thickness in the NW Dinarides, has been recently constrained by many different studies (Brückl et al, 2007;Behm et al, 2007;Šumanovac, 2010;Stipčević et al, 2011;Guidarelli et al, 2017, Kapuralić et al, 2019Stipčević et al, 2020). It varies from about 38 to 45 km under the External Dinarides, slightly thickening towards the Alps and thinning to about 30 km in the Adriatic foreland and 25 km in the Pannonian basin.…”

Section: Tectonic Setting and Crustal Structurementioning

confidence: 99%

“…The arrival times were picked mainly at seismic stations of the Seismic Network of the Republic of Slovenia (Slovenian Environment Agency, 2001) together with seismic stations belonging to other seismic networks and temporary seismic arrays in the region (Zentralanstalt Für Meteorologie Und Geodynamik, 1987;MedNet Project Partner Institutions, 1990;University of Zagreb, 2001;OGS, 2002;INGV Seismological Data Centre, 2006;AlpArray Seismic Network, 2015;OGS, 2016). The Seismic Network of the Republic of Slovenia (SNRS) was gradually modernised between 2001 and 2008 and currently consists of 26 permanent stations (Vidrih et al, 2006;Jesenko & Živčić, 2018). During the last 16 years, many temporary stations have been in operation in Slovenia.…”

Section: Datamentioning

confidence: 99%

“…Compared to today's situation, the results of these studies were obtained with a relatively small amount of data. Seismic station coverage in the area improved significantly with the gradual modernization of the Seismic network of the Republic of Slovenia (SNRS) between (Jesenko & Živčić, 2018 and the deployment of additional seismic stations in Croatia within the VELEBIT project (2015VELEBIT project ( -2019, and during 2015 and 2016 as part of the AlpArray project (Molinari et al, 2016). With better station coverage and smaller epicentral distances, we are now able to sample the upper crustal structure more densely, and therefore calculate more accurate upper-crustal velocity models.…”

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1-D velocity structure modelling of the Earth's Crust in the NW Dinarides

Rajh

Stipčević

Živčić

et al. 2021

Preprint

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Abstract. The investigated area of the NW Dinarides is located at the NE corner of the Adriatic microplate and is bordered by the Adriatic foreland, the Southern Alps, and the Pannonian basin. Its complex crustal structure is the result of interactions among different tectonic units, mainly the Eurasian plate and the Adriatic microplate. Despite numerous seismic studies in this tectonically complex area, there is still a need for a detailed, small scale study focusing mainly on the upper, brittle part of the crust. We investigated the crustal velocity structure with 1-D simultaneous hypocenter-velocity inversion using routinely picked P wave arrival times. Most of the computed models converged to a stable solution in the depth range between 0 and 26 km. We further evaluated the inversion results with hypocenter shift tests, high and low velocity tests, and relocations. This helped us to select two best performing velocity models for the whole study area. Based on these results and the seismicity distribution, we further divided the study area into three parts, redefined the earthquake-station geometry, and performed inversion for each part separately to gain better insight into the crustal structure of each subregion. Median velocities in the upper 20 km of the crust in the eastern subregion are lower compared to the regional median and the median of the other two subregions. The northwestern and southwestern subregions are very similar in terms of crustal structure between about 8 and 23 km depth. The largest difference between them is observed in the upper 8 km, with higher median velocities in the southwestern subregion. Compared to the model currently used at Slovenian Environment Agency to locate earthquakes, the velocity models obtained show higher velocities in the upper 30 km depth and agree very well with some of the previous studies. In addition to general structural implications and a potential for improving seismic tomography results, the new 1-D velocity models can also be used for fast routine earthquake location and for detecting systematic travel time errors in seismological bulletins.

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3D physics-based seismic shaking scenarios for city of Zagreb, Capital of Croatia

Latečki

Molinari

Stipčević

2021

Bull Earthquake Eng

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Crustal structure of the northern Dinarides and southwestern part of the Pannonian basin inferred from local earthquake tomography

Cited by 12 publications

References 45 publications

Crustal Thickness Beneath the Dinarides and Surrounding Areas From Receiver Functions

Crustal Thickness Beneath the Dinarides and Surrounding Areas From Receiver Functions

1-D velocity structure modelling of the Earth's Crust in the NW Dinarides

3D physics-based seismic shaking scenarios for city of Zagreb, Capital of Croatia

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