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Insights on the upper mantle beneath the Eastern Alps.

Bianchi I, Miller MS, Bokelmann G - Earth Planet. Sci. Lett. (2014)

Bottom Line: Analyses of Ps and Sp receiver functions from datasets collected by permanent and temporary seismic stations, image a seismic discontinuity, due to a negative velocity contrast across the entire Eastern Alps.The receiver functions show the presence of the discontinuity within the upper mantle with a resolution of tens of kilometers laterally.Comparison with previous studies renders it likely that the observed discontinuity coincides with the lithosphere-asthenosphere boundary (LAB) east of 15°E longitude, while it could be associated with a low velocity zone west of 15°E.

View Article: PubMed Central - PubMed

Affiliation: Institut für Meteorologie und Geophysik, Universität Wien, Althanstraße 14 (UZA II), 1090 Vienna, Austria.

ABSTRACT

Analyses of Ps and Sp receiver functions from datasets collected by permanent and temporary seismic stations, image a seismic discontinuity, due to a negative velocity contrast across the entire Eastern Alps. The receiver functions show the presence of the discontinuity within the upper mantle with a resolution of tens of kilometers laterally. It is deeper (100-130 km) below the central portion of the Eastern Alps, and shallower (70-80 km) towards the Pannonian Basin and in the Central Alps. Comparison with previous studies renders it likely that the observed discontinuity coincides with the lithosphere-asthenosphere boundary (LAB) east of 15°E longitude, while it could be associated with a low velocity zone west of 15°E.

No MeSH data available.


Related in: MedlinePlus

PRF common-conversion-point (CCP) profiles migrated at 40 km depth along profiles AA′, BB′ and CC′ (see Fig. 1 for locations). “Spot” 4 and 8, as well as profiles crossings are marked. PRF are computed with a frequency cut off of 0.5 Hz. The most prominent converted phase (Psm) (occurring between 30 and 50 km depth on the three profiles) has been recognized as the Moho. Blue dashed line highlights the Psm along the profiles. Predicted arrival times of the Moho multiples are marked by a further blue dashed line (PpPsm phase) and by a red dashed line (for the negative PsPs + PpSs phase). Black dashed lines mark the arrival of a converted phase at a crustal interface, its multiples are marked by a further black line, and by a purple dashed line for the negative amplitude multiple. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
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fg0030: PRF common-conversion-point (CCP) profiles migrated at 40 km depth along profiles AA′, BB′ and CC′ (see Fig. 1 for locations). “Spot” 4 and 8, as well as profiles crossings are marked. PRF are computed with a frequency cut off of 0.5 Hz. The most prominent converted phase (Psm) (occurring between 30 and 50 km depth on the three profiles) has been recognized as the Moho. Blue dashed line highlights the Psm along the profiles. Predicted arrival times of the Moho multiples are marked by a further blue dashed line (PpPsm phase) and by a red dashed line (for the negative PsPs + PpSs phase). Black dashed lines mark the arrival of a converted phase at a crustal interface, its multiples are marked by a further black line, and by a purple dashed line for the negative amplitude multiple. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)

Mentions: In order to validate the quality of our data, we show the three profiles AA′, BB′ and CC′ migrated at 40 km depth (in Fig. 3). The most prominent Ps phase (occurring between 30 and 50 km depth on the three profiles) has been recognized as the Moho; at 200–240 km within profile AA′ and at 150–200 km within BB′, the phase marked by a black dashed line, does not correspond to the Moho estimates by Brückl et al. (2007) and Grad et al. (2009), this phase might therefore be due to an intracrustal conversion. The blue dashed line highlights the Moho phase along the profiles. Predicted arrival times for the Moho multiples are displayed in the figure and labeled as PpPs (for the earlier positive multiple) and PsPs + PpSs (for the later negative multiple).


Insights on the upper mantle beneath the Eastern Alps.

Bianchi I, Miller MS, Bokelmann G - Earth Planet. Sci. Lett. (2014)

PRF common-conversion-point (CCP) profiles migrated at 40 km depth along profiles AA′, BB′ and CC′ (see Fig. 1 for locations). “Spot” 4 and 8, as well as profiles crossings are marked. PRF are computed with a frequency cut off of 0.5 Hz. The most prominent converted phase (Psm) (occurring between 30 and 50 km depth on the three profiles) has been recognized as the Moho. Blue dashed line highlights the Psm along the profiles. Predicted arrival times of the Moho multiples are marked by a further blue dashed line (PpPsm phase) and by a red dashed line (for the negative PsPs + PpSs phase). Black dashed lines mark the arrival of a converted phase at a crustal interface, its multiples are marked by a further black line, and by a purple dashed line for the negative amplitude multiple. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4375711&req=5

fg0030: PRF common-conversion-point (CCP) profiles migrated at 40 km depth along profiles AA′, BB′ and CC′ (see Fig. 1 for locations). “Spot” 4 and 8, as well as profiles crossings are marked. PRF are computed with a frequency cut off of 0.5 Hz. The most prominent converted phase (Psm) (occurring between 30 and 50 km depth on the three profiles) has been recognized as the Moho. Blue dashed line highlights the Psm along the profiles. Predicted arrival times of the Moho multiples are marked by a further blue dashed line (PpPsm phase) and by a red dashed line (for the negative PsPs + PpSs phase). Black dashed lines mark the arrival of a converted phase at a crustal interface, its multiples are marked by a further black line, and by a purple dashed line for the negative amplitude multiple. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
Mentions: In order to validate the quality of our data, we show the three profiles AA′, BB′ and CC′ migrated at 40 km depth (in Fig. 3). The most prominent Ps phase (occurring between 30 and 50 km depth on the three profiles) has been recognized as the Moho; at 200–240 km within profile AA′ and at 150–200 km within BB′, the phase marked by a black dashed line, does not correspond to the Moho estimates by Brückl et al. (2007) and Grad et al. (2009), this phase might therefore be due to an intracrustal conversion. The blue dashed line highlights the Moho phase along the profiles. Predicted arrival times for the Moho multiples are displayed in the figure and labeled as PpPs (for the earlier positive multiple) and PsPs + PpSs (for the later negative multiple).

Bottom Line: Analyses of Ps and Sp receiver functions from datasets collected by permanent and temporary seismic stations, image a seismic discontinuity, due to a negative velocity contrast across the entire Eastern Alps.The receiver functions show the presence of the discontinuity within the upper mantle with a resolution of tens of kilometers laterally.Comparison with previous studies renders it likely that the observed discontinuity coincides with the lithosphere-asthenosphere boundary (LAB) east of 15°E longitude, while it could be associated with a low velocity zone west of 15°E.

View Article: PubMed Central - PubMed

Affiliation: Institut für Meteorologie und Geophysik, Universität Wien, Althanstraße 14 (UZA II), 1090 Vienna, Austria.

ABSTRACT

Analyses of Ps and Sp receiver functions from datasets collected by permanent and temporary seismic stations, image a seismic discontinuity, due to a negative velocity contrast across the entire Eastern Alps. The receiver functions show the presence of the discontinuity within the upper mantle with a resolution of tens of kilometers laterally. It is deeper (100-130 km) below the central portion of the Eastern Alps, and shallower (70-80 km) towards the Pannonian Basin and in the Central Alps. Comparison with previous studies renders it likely that the observed discontinuity coincides with the lithosphere-asthenosphere boundary (LAB) east of 15°E longitude, while it could be associated with a low velocity zone west of 15°E.

No MeSH data available.


Related in: MedlinePlus