Schardong, L; Chevrot, S; Garcia, RF; Calvet, M; (2011) A new approach to obtain improved P and S receiver functions globally: determination of crustal structure below seismic stations in the prospect of global tomography. [Lecture]. Presented at: American Geophysical Union Fall Meeting, San Francisco, USA.

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Abstract

Classical receiver functions allow us to determine average crustal parameters beneath a seismological station, such as crustal thickness or Poisson ratio. We present a new way to compute receiver functions, by deconvolving seismic records by the source time function of each individual earthquake, determined by waveform inversion of seismological records distributed globally. This waveform inversion is performed with a simulated annealing approach. Our method allows us to detect P-to-S conversions and crustal multiples on radial components, like in classical receiver function approaches. However, it also allows us to detect P reflections from the top of the Moho on vertical components, opening the way to apply seismic reflection techniques on teleseismic P wave records. We present results for several seismological stations, located in various tectonic environments. From the resulting simplified average crustal models, crustal corrections relative to ak135 model are computed, providing improved teleseismic travel time residuals of P and S phases.

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