Comprehensive Study of the Crust and Upper Mantle within East and West Antarctica Based on S-wave Receiver Functions

In regions with thick ice cover, reverberations within the ice layer create multiples that can be observed in P-wave receiver functions. The P-to-S (Ps) conversion from the crust-mantle boundary is often masked by the ice multiples. S-wave receiver functions (SRF) are an alternate way to estimate the crustal structure using the S-to-P (Sp) conversions, which do not interfere with the ice multiples. We analyzed broadband data from the AGAP and POLENET temporary networks encompassing 46 stations. Moho Sp arrivals are clearly seen at ~6-8 sec for the AGAP stations and at ~3-4 sec for the POLENET stations. The SRF's were migrated to depth using the 1D ak135 global velocity model. Stations for the TAMSEIS network are currently being examined. A grid search approach was used to obtain Moho depths constrained by both receiver functions and Rayleigh wave phase and group velocities on all three of the networks. A comprehensive study for East and West Antarctica will be presented using consistent methodology within all three of the networks, enabling direct comparisons among the three regions.