Short period Rayleigh wave group velocities in Antarctica determined by the cross-correlation of ambient seismic noise from the TAMSEIS array

• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: East Antarctica; Ross Sea; Transantarctic Mountains; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.9104; http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea035.pdf

Summary We cross-correlate ambient seismic noise from the TAMSEIS experiment to obtain estimates of the Rayleigh wave green’s function and measure group velocity dispersion curves. Preliminary results demonstrate that good quality green’s functions can be obtained using this technique in Antarctica and that they can be used to examine shorter period Rayleigh waves and the structure of the crust and uppermost mantle in the region of the Transantarctic mountains in more detail than previous studies. Dispersion curves measured in East Antarctica show good agreement and no indication of a thick sediment layer. Velocities measured from other station pairs suggest the fastest velocities at short periods occur in East Antarctica while the fastest velocities at periods longer than 15 seconds occur beneath the Ross Sea. The study will continue by extending this technique to all station pairs and then examining Rayleigh wave group velocities in the region using seismic tomography.