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| Titel |
P and S receiver functions observed at stations in Europe |
| VerfasserIn |
Ö. Çakir, A. Erduran, E. Kırkaya, Y. A. Kutlu, M. Erduran |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250059501
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| Zusammenfassung |
| We study the teleseismic P and S receiver functions at European seismic stations. From the
IRIS and ORFEUS databases, we visually select 3002 teleseismic, moderate-to-large
magnitude (i.e.Mw -¥ 5.7) events recorded by 255 broadband European stations with high
signal-to-noise ratio within the years 1990-2011. Corrected for the instrument response, the
observed seismograms are cut to a length of 100 s (30 s pre-event, 70 s post-event) in the case
of P receiver functions (PRF) and to a length of 100 s (70 s pre-event, 30 s post-event) in the
case of S receiver functions (SRF). We rotate the station/event reference frame (Z/R/T) into
the ray coordinate reference frame (L/Q/T or P/SV/SH) where the rotation angle is
estimated from a covariance analysis. We use a conventional technique to obtain the
receiver functions (Langston 1979; Vinnik 1977). All the components (L, Q and T)
are deconvolved by the L component (Q component) where the deconvolved Q
component (L component) produces PRF (SRF). The receiver function amplitudes are
normalized by the zero-lag time amplitude of the deconvolved Q component (L
component) of PRF (SRF) (Ammon 1991). We use a time domain deconvolution approach
(Menke 1984; Sheehan et al. 1995) to isolate the receiver function. In order to secure
the quality of measurements we suppress multiples from deep interfaces, remove
outliers and average over many measurements. The outlined analysis procedure yields
1701 L-component SRF and 2103 Q-component PRF. The azimuthal coverage of
both PRF and SRF waveforms binned at 20o backazimuth intervals is appropriate
to analyze the observed receiver functions in terms of both azimuthal and radial
anisotropy beneath most of the seismic stations. This work is supported by Turkish
Scientific and Technical Research Council (TUBITAK) (project number 109Y345). |
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