Focal mechanisms and the stress regime in NE and SW Tanzania, East Africa

Geophysical Research Letters

Volumn 32, Issue 14, 2005, Pages 1-4

  Brazier, Richard A ^a   Nyblade, Andrew A ^b   Florentin, Juliette ^b  

^a PENNSYLVANIA STATE UNIVERSITY   (United States)

^b PENNSYLVANIA STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EARTHQUAKES; GEOPHYSICS; KINEMATICS; LITHOLOGY; SEISMOGRAPHS; STRUCTURAL GEOLOGY; TECTONICS;

FOCAL MECHANISMS; KINEMATIC DEVELOPMENT; RIFT IMPINGES; RIFT SYSTEM; STRESS REGIME; TRANSITIONAL RIFT STRUCTURE;

SEISMOLOGY;

EARTHQUAKE; FOCAL MECHANISM; RIFTING; STRESS FIELD;

AFRICA; EAST AFRICA; EASTERN HEMISPHERE; SUB-SAHARAN AFRICA; TANZANIA; WORLD;

EID: 25444450098     PISSN: 00948276     EISSN: None     Source Type: Journal    
DOI: 10.1029/2005GL023156     Document Type: Article

References (28)

1. Calais, E., C. Ebinger, C. Hartnady, and J. Nocquet (2005), Kinematics of the East African Rift from GPS earthquake slip vector data, Geol. Soc. London Spec. Publ., in press.
2. Camelbeeck, T., and M. D. Iranga (1996), Deep crustal earthquakes and active faults along the Rukwa trough, East Africa, Geophys. J. Int., 124, 612-630.
3. Chorowicz, J., J. Le Fournier, C. Le Mut, J. P. Richert, F. L. S. Anderson, and J. J. Tiercelin (1983), Observations by remote sensing and on the ground of NW-SE dextral strike slip movements in the Tanganyika-Rukwa-Malawi transform zone of the East African Rift, C. R. Acad. Sci. Paris, 296, 997-1002.
4. Crotwell, P. H., T. J. Owens, and J. Ritsema (1999), The TauP toolkit; flexible seismic travel-time and ray-path utilities, Seismol. Res. Lett., 70, 154-160.
5. Dawson, J. B. (1992), Neogene tectonics and volcanicity in the North Tanzania sector of the Gregory Rift Valley: Contrasts with the Kenya sector, Tectonophysics, 204, 81-92.
6. Delvaux, D., K. Levi, R. Kajara, and J. Sarota (1992), Cenozoic paleostress and kinematic evolution of the Rukwa - North Malawi rift valley (East African rift system), Bull. Cent. Rech. Explor. Prod. Elf Aquitaine, 16, 383-406.
7. Delvaux, D., F. Kervyn, E. Vittori, R. S. A. Kajara, and E. Kilembe (1998), Late Quaternary tectonic activity and lake level change in the Rukwa Rift Basin, J. African Earth Sci., 26(3), 397-421.
8. Ebinger, C. J. (1989), Tectonic development of the western branch of the East African rift system, Geol. Soc. Am. Bull., 101, 885-903.
9. Ebinger, C. J., Y. Poudjom, E. Mbede, A. Foster, and J. B. Dawson (1997), Rifting Archean lithosphere: The Eyasi-Manyara-Natron rifts, East Africa, J. Geol. Soc. London, 154, 947-960.
10. Fairhead, J. D. (1980), The structure of cross-cutting volcanic chain of northern Tanzania and its relation to the East African Rift system, Tectonophysics, 65, 193-208.
11. Fairhead, J. D., and G. W. Stuart (1982), The seismicity of the East African Rift System and comparison with other continental rifts, in Continental and Oceanic Rifts, Geodyn. Ser, vol. 8, edited by G. Pálmason, pp. 41-61, AGU, Washington, D. C.
12. Ferdinand, R. W., and R. Arvidsson (2002), The determination of source mechanisms of small earthquakes and revised models of local crustal structure by moment tensor inversion, Geophys. J. Int., 151, 221-234.
13. Florentin, J. (2002), Upper mantle seismic velocity structure beneath the Tanzania Craton, East Africa, M.S. thesis, 100 pp., Penn State Univ., University Park.
14. Foster, A. J., and J. A. Jackson (1998), Source parameters of large African earthquakes; implications for crustal rheology and regional kinematics, Geophys. J. Int., 134, 422-448.
15. Foster, A., C. Ebinger, E. Mbede, and D. Rex (1997), Tectonic development of the northern Tanzanian sector of the East African rift system, J. Geol. Soc. London, 154, 689-700.
16. Jackson, J. A. (2002), Strength of the continental lithosphere: Time to abandon the jelly sandwich?, GSA Today, 12, 4-10.
17. Jackson, J. A., and T. Blenkinsop (1993), The Malawi earthquake of 10 March, 1989: Deep faulting within the East African rift system, Tectonics, 12, 1131-1139.
18. Lahr, J. C. (1993), Hypoellipse, a computer program for determining local earthquake hypocentral parameters, magnitude and first motion pattern, U.S. Geol. Surv. Open File Rep., 89-116.
19. Langston, C. A., R. Brazier, A. A. Nyblade, and T. J. Owens (1998), Local magnitude scale and seismicity rate for Tanzania, East Affica, Bull. Seismol. Soc. Am., 88, 712-721.
20. Langston, C. A., A. A. Nyblade, and T. J. Owens (2002), Regional wave propagation in Tanzania, East Africa, J. Geophys. Res., 107(B1), 2003, doi:10.1029/200IJB000167.
21. Last, R., A. A. Nyblade, C. A. Langston, and T. J. Owens (1997), Crustal structure of the East African plateau from receiver functions and Rayleigh wave phase velocities, J. Geophys. Res., 102, 24,469-24,483.
22. Nyblade, A. A., and C. A. Langston (1995), East African earthquakes below 20 km depth and their implications for crustal structure, Geophys. J. Int., 121, 49-62.
23. Ring, U., C. Betzler, and D. Delvaux (1992), Normal vs. strike-slip faulting during rift development in East Africa: The Malawi rift, Geology, 20, 1015-1018.
24. Shudofsky, G. (1985), Source mechanisms and focal depths of East Aftican earthquakes using Rayleigh-wave inversion and body wave modeling, Geophys. J. R. Astron. Soc., 83, 563-614.
25. Shudofsky, G. N., S. Cloetingh, S. Stein, and R. Wortel (1987), Unusually deep earthquakes in East Africa: Constraints on the thermo-mechanical structure of a continental rift system, Geophys. Res. Lett., 14, 741-744.
26. Theunissen, K., J. Klerkx, A. Melnikov, and A. Mruma (1996), Mechanisms of inheritance of rift faulting in the western branch of the East African Rift, Tanzania, Tectonics, 15, 776-790.
27. Tiercelin, J. J., J. Chorowicz, H. Bellon, J. P. Richert, J. T. Mwanbene, and F. Walgenwitz (1988), East African Rift system: Offset, age and tectonic significance of the Tanganiyika-Rukwa-Malawi intracontinental transcurrent fault zone, Tectonophysics, 148, 241-252.
28. Zhao, M., C. A. Langston, A. A. Nyblade, and T. J. Owens (1997), Lower crustal rifting in the Rukwa Graben, East Africa, Geophys. J. Int., 129, 412-420.