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| Titel |
Group and phase velocities from deterministic and ambient sources measured during the AlpArray-EASI experiment |
| VerfasserIn |
Petr Kolínský, Dimitri Zigone, Florian Fuchs, Irene Bianchi, Ehsan Qorbani, Maria-Theresia Apoloner, Götz Bokelmann, AlpArray-EASI Working group |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250128214
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| Publikation (Nr.) |
 EGU/EGU2016-8180.pdf |
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| Zusammenfassung |
| The Eastern Alpine Seismic Investigation (EASI) was a complementary experiment
to the AlpArray project. EASI was composed of 55 broadband seismic stations
deployed in a winding swath of 540 km length along longitude 13.350 E from the
Czech-German border to the Adriatic Sea. Average north-south inter-station distance was
10 km, the distance of each station to either side of the central line was 6 km. Such a
dense linear network allows for surface wave dispersion measurements by both
deterministic and ambient noise sources along the same paths. During the experiment
(July 2014 – August 2015), three earthquakes ML = 2.6, 2.9 and 4.2 occurred
in Austria and Northern Italy only several kilometers off the swath. We measure
Rayleigh and Love wave group velocities between the source and a single station for
the recorded earthquakes, as well as phase velocities between selected pairs of
stations using the standard two-station method. We also calculate cross-correlations of
ambient noise between selected pairs of stations and we determine the corresponding
group velocity dispersion curves. We propose a comparison of phase velocities
between two stations measured from earthquakes with group velocities obtained from
cross-correlations for the same station pairs. We also compare group velocities measured
at single station using earthquakes, which occurred along the swath, with group
velocities measured from cross-correlations. That way we analyze velocities of both
deterministic and ambient noise reconstructed surface waves propagating along the
same path. We invert the resulting dispersion curves for 1D shear wave velocity
profiles with depth and we compile a quasi-2D velocity model along the EASI swath. |
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