Crustal structures in the central-eastern Alpine sector: A revision of the available DSS data

Scarascia, S.; Cassinis, R.

doi:10.1016/s0040-1951(96)00206-5

Cited by 64 publications

(58 citation statements)

References 12 publications

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“…We hypothesize that the amplitude decay observed in the distance range of 0-30 km is due to the attenuation characteristics of the upper crust. To explore the depth of influence on this distance range we made raytracing estimates using two velocity models based on deep seismic sounding results reported by SCARASCIA and CASSINIS (1997). The first consists of a three-layer average velocity model used by INGV for routine earthquake location (see Table 2) and the second one is a 6-layer velocity model with a total crustal thickness of 40 km (model 2 in Table 2) reported by SCARASCIA and CASSINIS (1997).…”

Section: A Two-layer Q Modelmentioning

confidence: 99%

“…To explain the attenuation observed at this distance range, we consider a two-layer Q model, the first layer, representing the upper crust, with a thickness of approximately 30 km and a second layer that includes the lower crust and the most upper mantle. Based on the seismic profiles reported by SCARASCIA and CASSINIS (1997) for the Lombardian Southern Alps, near the region of Garda, the Moho discontinuity is at a depth varying between 38 and 50 km. Their resulting velocity models show that for recording distances of 35-90 km the deeper raypaths correspond to waves refracted on the Moho.…”

Section: A Two-layer Q Modelmentioning

confidence: 99%

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Body-wave Attenuation in the Region of Garda, Italy

Castro

Massa

Augliera

et al. 2008

Pure appl. geophys.

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We analyzed the spectral amplitude decay with hypocentral distance of P and S waves generated by 76 small magnitude earthquakes (M L 0.9-3.8) located in the Garda region, Central-Eastern Alps, Italy. These events were recorded by 18 stations with velocity sensors, in a distance range between 8 and 120 km. We calculated nonparametric attenuation functions (NAF) and estimated the quality factor Q of both body waves at 17 different frequencies between 2 and 25 Hz. Assuming a homogeneous model we found that the Q frequency dependence of P and S can be approximated with the functions Q P = 65 f 0.9 and Q S = 160 f 0.6 , respectively. At 2 Hz the Q S /Q P ratio reaches the highest value of 2.8. At higher frequencies Q S /Q P varies between 0.7 and 1.7, suggesting that for this frequency band scattering may be an important attenuation mechanism in the region of Garda. To explore the variation of Q in depth, we estimated Q at short (r B 30 km) and intermediate (35-90 km) distance paths. We found that in the shallow crust P waves attenuate more than S (1.3 < Q S /Q P < 2.5). Moreover, P waves traveling along paths in the lower crust (depths approximately greater than 30 km) attenuate more than S waves. To quantify the observed variability of Q in depth we considered a three-layer model and inverted the NAF to estimate Q in each layer. We found that in the crust Q increases with depth. However, in the upper mantle (*40-50 km depth) Q decreases and in particular the high frequency Q S (f > 9 Hz) has values similar to those estimated for the shallow layer of the crust.

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Section: A Two-layer Q Modelmentioning

confidence: 99%

Section: A Two-layer Q Modelmentioning

confidence: 99%

Body-wave Attenuation in the Region of Garda, Italy

Castro

Massa

Augliera

et al. 2008

Pure appl. geophys.

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“…Thickening of the crust is observed in the region of the Tauern Window and Friuli, North East Italy, consistently with the isostatic compensation of the topography. Beneath that domain the lithosphere forms a root reaching a depth of 220 km (Scarascia and Cassinis, 1997). In contrast, the crust and lithosphere of the Pannonian Basin is thin and warm.…”

Section: Crustmentioning

confidence: 99%

Geokinematics of Central Europe: New insights from the CERGOP-2/Environment Project

Aichhorn

Becker

Feješ³

et al. 2008

Journal of Geodynamics

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The Central European Geodynamics Project CERGOP-2, funded by the European Union from 2003 to 2006 under the 5th Framework Programme, benefited from repeated measurements of the coordinates of epoch and permanent GPS stations of the Central European GPS Reference Network (CEGRN), starting in 1994. Here we report on the results of the systematic processing of available data up to 2005. The analysis has yielded velocities for some 60 sites, covering a variety of Central European tectonic provinces, from the Adria Indenter to the Tauern Window, the Dinarides, the Pannonian Basin, the Vrancea Seismic Zone and the Carpathian Mountains. The estimated velocities define kinematical patterns which outline, with varying spatial resolution depending on the station density and history, the present-day surface kinematics in Central Europe. Horizontal velocities are analyzed after removal from the ITRF2000 estimated velocities of a rigid rotation accounting for the mean motion of Europe: a ∼2.3 mm/year north-south oriented convergence rate between Adria and the Southern Alps that can be considered to be the present-day velocity of the Adria Indenter relative to the European Foreland. An eastward extrusion zone initiates at the Tauern Window. The lateral eastward flow towards the Pannonian Basin exhibits a gentle gradient from 1 to 1.5 mm/year immediately east of the Tauern Window to zero in the Pannonian Basin. This kinematic continuity implies that the Pannonian plate fragment recently suggested by seismic data does not require a specific Eulerian pole. On the southeastern boundary of the Adria microplate, we report a velocity drop from 4 to 4.5 mm/year motion near Matera to ∼1 mm/year north of the Dinarides, in the southwestern part of the Pannonian Basin. A positive velocity gradient as one moves south from West Ukraine across Rumania and Bulgaria is estimated to be 2 mm/year on a scale of 600-800 km, as if the crust were dragged by the counterclockwise rotation along

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“…The Alpine longitudinal profile (ALP'75) extended along the axis of the Western and Eastern Alps to the Pannonian basin (e.g., Yan and Mechie, 1989;Scarascia and Cassinis, 1997). WAR/R as well as steep angle reflection profiles were also measured in the Bohemian Massif, the Pannonian Basin, and the Dinarides (e.g., Beránek and Zátopek, 1981;Posgay et al, 1981;Joksović and Andrić, 1983).…”

Section: Seismic Profiles Through the Crustmentioning

confidence: 99%

Lithospheric Structure and Tectonics of the Eastern Alps – Evidence from New Seismic Data

Brückl¹

2011

Tectonics

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Crustal structures in the central-eastern Alpine sector: A revision of the available DSS data

Cited by 64 publications

References 12 publications

Body-wave Attenuation in the Region of Garda, Italy

Body-wave Attenuation in the Region of Garda, Italy

Geokinematics of Central Europe: New insights from the CERGOP-2/Environment Project

Lithospheric Structure and Tectonics of the Eastern Alps – Evidence from New Seismic Data

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