The use of velocity spectra for stacking receiver functions with application to IRIS/IDA stations OBNINSK (OBN) and ARTI (ARU), Russia

Details The use of velocity spectra for stacking receiver functions with application to IRIS/IDA stations OBNINSK (OBN) and ARTI (ARU), Russia The use of velocity spectra for stacking receiver functions with application to IRIS/IDA stations OBNINSK (OBN) and ARTI (ARU), Russia

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ucsd.reptq....g&link_type=abstract

Final Report, 1 Dec. 1991 - 30 Oct. 1992 California Univ., San Diego, La Jolla. Inst. of Geophysics and Planetary Physics.

Physics

Geophysics

Earth Crust, Earth Mantle, Ground Stations, Planetary Structure, Receivers, Seismology, Signal To Noise Ratios, Spectrum Analysis, Velocity, Ray Tracing, Russian Federation

Scientific paper

To improve signal to noise ratio (SNR), it is typical to stack receiver functions calculated from events at similar distances and back azimuths. We have adapted the velocity spectrum stacking (VSS) technique from reflection seismology to stack data with different ray parameters and improve the SNR. The VSS technique exploits differences in the shapes of the moveout curves of converted phases and reverberations to separate phases and infer velocity structure. By applying conventional receiver function techniques to the IRIS/IDA seismographic station at Obninsk, Russia, we infer a 2 km thick slow velocity surface layer and a 47 km depth to Moho with relatively uncomplicated crustal structure. By comparing VSS computed for OBN and Arti (ARU), Russia with PREM synthetics we have identified Ps phases from the 400 and 670 km discontinuities. We find mantle structure characterized by higher S velocities and deeper discontinuities than PREM. We find no evidence of a 210 km discontinuity beneath either station. VSS comparisons between OBN and ARU imply that the 670 km discontinuity is about 2 km shallower beneath ARU than OBN.

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