HR: 1340h
AN: S33A-1051    [Abstracts]
TI: Rayleigh wave tomography of southern Africa: Preliminary results from AfricaArray
AU: * Adams, A
EM: aadams@geosc.psu.edu
AF: Department of Geosciences, Penn State University, University Park, PA 16802, United States
AU: Nyblade, A
EM: andy@geosc.psu.edu
AF: Department of Geosciences, Penn State University, University Park, PA 16802, United States
AU: Weeraratne, D
EM: dsw@csun.edu
AF: Department of Geological Sciences, California State University, Northridge, Northridge, CA 91330, United States
AB: In this study data from permanent AfricaArray broadband seismic stations in southern Africa are combined with data from GSN stations to create phase velocity maps of fundamental mode Rayleigh waves. Phase velocity measurements are made using the Forsyth and Li method, where incoming Rayleigh waves are approximated as two plane waves to account for the distortion of the incoming wave field by heterogeneities outside the array. The distribution of the AfricaArray stations allows for better imaging of the lithosphere near the craton edges than is possible using previous datasets. Rayleigh wave dispersion curves and two-dimensional phase velocity maps produced from the data recorded in the first year will be presented, along with a preliminary interpretation for lithospheric structure.
DE: 7205 Continental crust (1219)
DE: 7218 Lithosphere (1236)
DE: 7255 Surface waves and free oscillations
DE: 7270 Tomography (6982, 8180)
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: 2007 Fall Meeting