Lithospheric structure of the southern French Alps inferred from broadband analysis

Details Lithospheric structure of the southern French Alps inferred from broadband analysis Lithospheric structure of the southern French Alps inferred from broadband analysis

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..122...79b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 122, Issue 1-2, p. 79-102.

Physics

6

Scientific paper

Broadband receiver functions analysis is commonly used to evaluate the fine-scale S-velocity structure of the lithosphere. We analyse teleseismic P-waves and their coda from 30 selected teleseismic events recorded at three seismological stations of to the French TGRS network in the Alpes Maritimes. Receiver functions are computed in the time domain using an SVD matrix inversion method. Dipping Moho and lateral heterogeneities beneath the array are inferred from the amplitude, arrival time and polarity of locally-generated PS phases. We propose that the Moho dips /11° towards /25°+/-10°N below station CALF, in the outer part of the Alpine belt. At this station, we determine a Moho depth of about /20+/-2km; the same depth is suggested below SAOF station also located in the fold-trust belt. Beneath station STET located in the inner part of the Alpine belt, the Moho depth increases to 30km and dips towards the N-NW. Moreover, 1D-modelling of summed receiver function from STET station constrains a crustal structure significantly different from that observed at stations located in the outer part of the Alps. Indeed, beneath CALF and SAOF stations we need a 2km thick shallow low velocity layer to fit best the observed receiver functions whereas this layer seems not to be present beneath STET station. Because recent P-coda studies have shown that near-receiver scattering can dominate teleseismic P-wave recordings in tectonically complicated areas, we account for effect of scattering energy in our records from array measurements. As the array aperture is wide relative to the heterogeneity scale length in the area, the array analysis produces only smooth imaging of scatterers beneath the stations.

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