Tanzania Broadband Seismic Experiment (TANZANIA)
Andrew A Nyblade
+1 814 863-8341
+1 814 863-7823
Department of Geosciences, Penn State University, University Park, PA, 16802, U.S.A.
Langston, C.A., R.A. Brazier, A.A. Nyblade, and T. J. Owens, Local magnitude scale and seismicity rate for Tanzania, East Africa, Bull. Seis. Soc. Am.,88, 712-721, 1998. Zhao, M., C.A. Langston, and A.A. Nyblade, Upper mantle velocity structure beneath southern Africa from modeling regional seismic data, J. Geophys. Res., 104, 4783-4794, 1999. Owens, T.J., A. Nyblade, H. Gurrola, and C. Langston, Mantle transition zone structure beneath Tanzania, East Africa, Geophys. Res. Lett., 827-830, 2000. Brazier, R., A.A. Nyblade, C. A. Langston, and T.J. Owens, Pn velocities beneath the Tanzania Craton and adjacent rifted mobile belts, East Africa, Geophys. Res. Lett., 27, 2365-2368, 2000. Nyblade, A.A., T.J. Owens, H. Gurrola, J. Ritsema and C.A. Langston, Seismic evidence for a deep upper mantle thermal anomaly beneath East Africa, Geology, 7, 599-602, 2000. C. A. Langston, A. A. Nyblade, and T. J. Owens, 2002. Regional wave propagation in Tanzania, East Africa. J. Geophys. Res., 107, 10.1029/2001JB000167.
This was a collaborative project between A. Nyblade and C. Langston at Penn State, T. Owens at the University of South Carolina, and colleagues at the Geological Survey in Tanzania aimed at evaluating the current model for deep continental structure by examining the stability of cratonic lithosphere in an area of active tectonism, East Africa. The cratonic lithosphere in East Africa (the Tanzania Craton) has been subjected to Cenozoic extensional tectonism, providing a unique opportunity to determine if deep cratonic structure can survive an extensional event that has thermally and mechanically disrupted adjacent younger lithosphere. To investigate the deep structure of the Tanzania Craton, we deployed 20 broadband seismic stations for one year (May 1994-May 1995) in two 1000-km long arrays spanning Tanzania from east to west and northeast to southwest (Figure 1). Sites crossed the craton and rifted mobile belts flanking the craton. Stations were spaced about 100 km apart. The total data recovery for the experiment was ~85%, yielding a data volume of over 150 Gbytes containing hundreds of teleseismic events and between 10,000 and 15,000 regional and local events. The data were released to the scientific community via the IRIS Data Management Center in 1997. In addition, some 1500 new gravity measurements were made in northeastern Tanzania as part of this project, as well as several new heat flow determinations.
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