The Wonji fault belt (Main Ethiopian Rift): Structural and geomorphological constraints and GPS monitoring

Geological Society Special Publication

Volumn 259, Issue , 2006, Pages 191-207

  Pizzi, Alberto ^a   Coltorti, Mauro ^b   Abebe, Bekele ^c   Disperati, Leonardo ^b   Sacchi, Giorgio ^b   Salvini, Riccardo ^b  

^a UNIVERSITY OF CHIETI   (Italy)

^b UNIVERSITY OF SIENA   (Italy)

^c ADDIS ABABA UNIVERSITY   (Ethiopia)

Author keywords

[No Author keywords available]

Indexed keywords

FAULTING; GEOMORPHOLOGICAL MAPPING; GPS; PLATE MOTION; RIFT ZONE; SLIP RATE; STRUCTURAL GEOLOGY; TECTONIC EVOLUTION;

AFRICA; EAST AFRICAN RIFT; ETHIOPIAN RIFT; SUB-SAHARAN AFRICA;

EID: 33745795590     PISSN: 03058719     EISSN: None     Source Type: Book Series    
DOI: 10.1144/GSL.SP.2006.259.01.16     Document Type: Article

References (72)

1. Abbate, E., Passerini, P. & Zan, L. 1995. Strike-slip faults in a rift area: a transect in the Afar Triangle, East Africa. Tectonophysics, 241, 67-97.
2. Abebe, B., Boccaletti, M., Bonini, M., Mazzuoli, R., Piccardi, L., Tortorici, L. & Trua, T. 1997. Geological Map of Asela Region. S.E.L.C.A., Florence, Italy.
3. Abebe, B., Coltorti, M. & Pizzi, A. 2005. Rates of Late Quaternary deformation along the Wonji fault belt in the Lakes Region, Main Ethiopian Rift. Rendiconti Società Geologica Italiana, 1, 41-43.
4. Acocella, V. & Korme, T. 2002. Holocene extension direction along the Main Ethiopian Rift, Africa. Terra Nova, 14, 191-197.
5. Ayele, A. 2000. Normal left-oblique fault mechanisms as an indication of sinistral deformation between the Nubia and Somalia plates in the Main Ethiopian Rift. Journal of African Earth Sciences, 31, 359-367.
6. Ayele, A. & Kulhanek, O. 2000. Reassessment of source parameters for three major earthquakes in the East African rift system from historical seismograms and bulletins. Annali di Geofisica, 43, 81-94.
7. Ayalew, D., Barbey, P., Marty, B., Reisberg, L., Yirgu, G. & Pik, R. 2002. Source, genesis and timing of giant ignimbrite deposits associated with Ethiopian continental flood basalts. Geochimica et Cosmochimica Acta, 66, 1429-1448.
8. Benvenuti, M., Carnicelli, S., et al. 2002. The Ziway-Shala Lake Basin (Main Ethiopian Rift, Ethiopia): a revision of basin evolution with special reference to the Late Quaternary. Journal of African Earth Sciences, 35, 247-269.
9. Bigazzi, B., Bonadonna, F.P., Di Paola, G.M. & Giuliani A. 1993. K-Ar and fission-track ages of the last volcano tectonic phase in the Ethiopian Rift Valley (Tullu Moyè area). Geology and mineral resources of Somalia and surrounding regions, 113, 311-322.
10. Bilham, R., Bendick, R., Larson, K., Braun, J. Tesfaye, S., Mohr, P. & Asfaw, L. 1999. Secular and tidal strain across the Ethiopian Rift. Geophysical Research Letters, 27, 2789-2793.
11. Boccaletti, M., Mazzuoli, R., Bonini, M., Trua, T. & Abebe, B. 1999. Plio-Quaternary volcanotectonic activity in the northern sector of the Main Ethiopian Rift: relationships with oblique rifting. Journal of African Earth Science, 29, 679-698.
12. Bonini, M., Souriot, T., Boccaletti, M. & Brun, J.P. 1997. Successive orthogonal and oblique extension episodes in a rift zone: Laboratory experiments with application to the Ethiopian Rift. Tectonics, 16, 347-362.
13. Bonnefille, R., Vincens, A. & Buchet, G. 1987. Palaeolimnology, stratigraphy and paleoenvironment of a Pliocene hominid site (2.9-3.3 m.y.) at Hadar, Ethiopia. Palaeogeography, Palaeoclimatology, Palaeoecology, 3(60), 249-281.
14. Bosellini, A., Russo, A., Fantozzi, P.L., Assefa, G. & Solomon, T. 1997. The Mesozoic succession of the Mekele outlier (Tigré Province, Ethiopia). Memorie di Scienze Geologische, 9, 95-116.
15. Bosworth, W., Strecker, M.R. & Blisniuk, P.M. 1992. Integration of East African paleostress and present-day stress data: implications for continental stress field dynamics. Journal of Geophysical Research, 97, 11851-11865.
16. Casey, M., Ebinger, C., Keir, D., Gloaguen, R. & Mohamed, F. 2006. Strain accomodation in transitional rifts: extension by magma intrusion and faulting in Ethiopian rift magmatic segments. In: Yirgu, G., Ebinger, C.J. & Maguire, P.K.H. (eds) The Afar Volcanic Province within the East African Rift System. Geological Society, London, Special Publications, 259, 143-163.
17. Chernet, T., Hart, W.K., Aronson, J.L. & Walter, R.C. 1998. New age constraints on the timing of volcanism and tectonism in the northern Main Ethiopia Rift-southern Afar transition zone (Ethiopia). Journal of Volcanology and Geothermal Research, 80, 267-280.
18. Chorowicz, J., Collet, B., Bonavia, F.F. & Korme, T. 1994. Northwest to north-northwest extension direction in the Ethiopian Rift deduced from the orientation of extension structures and fault-slip analysis. Bulletin of the Geological Society of America, 150, 1560-1570.
19. Chu, D. & Gordon, R.G. 1999. Evidence for motion between Nubia and Somalia along the Southwest Indian Ridge. Nature, 398, 64-67.
20. Coblentz, D.D. & Sandiford, M. 1994. Tectonic stresses in the African plate: constraints on the ambient lithospheric stress state. Geology, 22, 831-834.
21. Coltorti, M., Corbo, L. & Sacchi, G. 2002a. New evidence for the Late Pleistocene and Holocene climatic changes in the Lake Region. Proceedings of the Symposium: IAG International Geomorphologist Association. In: Dramis, F. (ed.) 'Climate Changes, Active Tectonics and Related Geomorpologic Effects in High Mountain Belts and Plateaux', Addis Ababa, 9-10.12.2002, 30-35.
22. Coltorti, M., Pizzi, A., Corbo, L. & Sacchi, G. 2002b. The gravitational collapse along the margin of the Ethiopian plateau near Asela (Ethiopia). Proceedings of the Symposium: IAG International Geomorphologist Association. In: Dramis, F. (ed.) 'Climate Changes, Active Tectonics and Related Geomorpologic Effects in High Mountain Belts and Plateaux', Addis Ababa, 9-10.12.2002, 10-14.
23. Coltorti, M., Pizzi, A., Corbo, L. & Sacchi, G. 2002c. Fault activity, river captures and delta-growth on the eastern side of the Ziway lake (Ethiopia). Proceedings of the Symposium: IAG International Geomorphologist Association. In: Dramis, F. (ed.) 'Climate Changes, Active Tectonics and Related Geomorpologic Effects in High Mountain Belts and Plateaux', Addis Ababa, 9-10.12.2002, 15-19.
24. Coltorti, M., Dramis, F. & Ollier, C.D. 2006. Planation surfaces in Northern Ethiopia. Geomorphology, (in press).
25. Corti, G., Bovini, M., Innocenti, F., Manetti, P., Mazzarini, F. & Abebe, T. 2003. Volcano-tectonic evolution of the main ethiopian rift. Geophysical Research Abstracts, 5, 09405.
26. Coulié, E., Quidelleur, X., Gillot, P.Y., Courtillot, V., Lefèvre, J.C. & Chiesa, S. 2003. Comparative K-Ar and Ar/Ar dating of Ethiopian and Yemenite Oligocene volcanism: implications for timing and duration of the Ethiopian Traps. Earth and Planetary Science Letters, 206, 477-492.
27. Dansgaard, W., Johnsen, S.J., et al. 1993. Evidence for general instability of past climate from a 250 kyr ice-core record. Nature, 364, 218-220.
28. Delvaux, D. 1993. Tensor program for paleostress reconstruction: examples from the East African and the Baikal Rift Zones. Abstract supplement 1 to Terranova, 5, 216.
29. Di Paola, G.M., Berhe, S.M. & Arno, V. 1993. The Kella Horst: its origin and significance in crustal attenuation and magmatic processes in the Ethiopian rift valley. In: Geology and Mineral Resources of Somalia and Surrounding Regions, Istituto Agronomico Oltremare, Firenze, Relazioni e Monografie, 113, 323-338.
30. Ebinger, C.J. 1989. Tectonic development of the western branch of the east African rift system. Geological Society of America Bulletin, 101, 885-903.
31. Ebinger, C.J. 2005. Continental breakup: The East African perspective. Astronomy and Geophysics, 46, 2.16-2.21.
32. Ebinger, C.J. & Casey, M. 2001. Continental breakup in magmatic provinces: An Ethiopian example. Geology, 29, 527-530.
33. Fernandez, R.M.S., Ambrosius, B.A.C., Noomen, R., Bastos, L., Combrinck, L., Miranda, J.M. & Spakman, W. 2004. Angular velocities of Nubia and Somalia from continuous GPS data: implications on present-day relative kinematics. Earth and Planetary Science Letters, 222, 197-208.
34. Foster, A.N. & Jackson, J.A. 1998. Source parameters of large African earthquakes: implications for crustal rheology and regional kinematics. Geophysics Journal International, 134, 422-448.
35. Gasse, F. & Street, F.A. 1978. Late Quaternary lake-level fluctuations and environments of the northern Rift Valley and Afar region (Ethiopia and Djibouti). Palaeogeography, Palaeoclimatology, Palaeoecology, 24, 279-325.
36. Gibson, I. 1969. The structure and volcanic geology of an axial portion of the Main Ethiopian Rift. Tectonophysics, 8, 561-565.
37. Grove, A.T., Street, F.A. & Goudie, A. 1975. Former lake levels and climatic change in the Rift Valley of southern Ethiopia. The Geographical Journal, 141, 177-202.
38. Gloaguen, R. & Casey, M. 2002. Dyke intrusion inferred from the morphology of induced faults in the Quaternary magmatic segments, Ethiopia. AGU Fall Meeting Abstracts, A1123.
39. Gouin, P. 1979. Earthquake History of Ethiopia and the Horn of Africa. International Development Research Centre, Ottawa, Ontario.
40. Hackett, W.R., Jackson, S.M. & Smith, R.P. 1996. Paleoseismology of volcanic environments. In: McCalpin, J.P. (ed.) Paleoseismology. International Geophysics Series, 62, 147-181.
41. 18O in mollusk from Pliocene Lake Hadar and modern Ethiopian Lakes: implications history of the Ethiopian monsoon. Palaeogeography, Palaeoclimatology, Palaeoecology, 186, 81-99.
42. Hofstetter, A. & Beyth, M. 2003. The Afar depression: interpretation of the 1960-2000 earthquakes. Geophysical Journal International, 155, 2, 715-732.
43. Huchon, P., Jestin, F., Cantagrel, J.M., Gaulier, J.M., Al Khirbash, S. & Gafaneh, A. 1991. Extensional deformations in Yemen since Oligocene and the Africa - Arabia - Somalia triple junction. Annales Tectonicae, 2, 141-162.
44. Jestin, F., Huchon, P. & Gaulier, J.M. 1994. The Somalia plate and the East African Rift system: present-day kinematics. Geophysical Journal International, 116, 637-654.
45. Kazmin, V., Berhe, S.F., Nicoletti, M. & Petrucciani, C. 1980. Evolution of the Northern part of the Ethiopian rift. Atti Convegni Lincei, 47: 275-292, Rome.
46. Kebede, F. & Van Eck, T. 1997. Probabilistic seismic hazard assessment for the Horn of Africa based on seismotectonic regionalisation. Tectonophysics, 270, 221-237.
47. Keir, D., Ebinger, C.J., Stuart, G.W., Daly, E., Ayele, A., Strain accommodation by magmatism and faulting as rifting proceeds to breakup: Seismicity of the nothern Ethiopian rift, in Journal of Geophysical Research: Solid Earth, Volume 111, Issue 5, 2006, DOI: 10.1029/2005JB003748.
48. Kendall, J.M., Stuart, G., Ebinger, C., Bastow, I. & Keir, D. 2005. Magma-assisted rifting in Ethiopia. Nature, 433, 146-148.
49. Keranen, L., Klemperer, S., Gloaguen, R. & EAGLE Working Group 2004. Imaging a proto-ridge axis in the Main Ethiopian rift. Geology, 39, 949-952.
50. Korme, T., Acocella, V. & Abebe, B. 2004. The role of pre-existing structures in the origin, propagation and architecture of faults in the Main Ethiopian rift. Gondwana Research, 7, 467-479.
51. Kurz, T., Gloaguen, R., Ebinger, C., Casey, M. & Abebe, B. 2005. Deformation distribution and type in the Main Ethiopian Rift(MER); a remote sensing study. Journal of African Earth Sciences (in press).
52. Izzeldin, A.Y. 1987. Seismicity, gravity and and magnetic surveys in the central part of the Red Sea: their interpretation and implication for the structure and evolution of the Red Sea. Tectonophysics, 143, 269-306.
53. Laury, R.L. & Albritton, C.C. 1975. Geology of Middle Stone Age Archaeological Sites in the Main Ethiopian Rift Valley. Geological Society of America Bulletin, 86, 999-1011.
54. Le Turdu, C., Hercelin, J.-J. et al. 1999. The Ziway-Shala lake basin system, Main Ethiopian Rift: influence of volcanism, tectonics, and climatic forcing on basin formation and sedimentation. Palaeogeography, Palaeoclimatology, Palaeoecology, 150, 135-177.
55. Mastin, L. & Pollard, D. 1988. Surface deformation and shallow dike intrusion processes at Inyo Craters, Long Valley, California. Journal of Geophysical Research, 93, 13,221-13,235.
56. Mazzarini, F., Corti, G., Manetti, P. & Innocenti, F. 2004. Strain rate and bimodal volcanism in the continental rift: Debre Zeyt volcanic field, northern MER, Ethiopia. Journal of African Earth Sciences, 39, 415-420.
57. Merla, G., Abbatee, E., Azzaroli, A., Bruni, P., Canuti, P., Fazzuolli, M., Sagri, M. & Tacconi, P. 1973. A geological map of Ethiopia and Somalia (1: 2 000 000 scale) and comments with map of major landforms. CNR, University of Florence, Centro Stampa Firenze, Italy, 95pp.
58. Merla, G. & Minucci, E. 1938. Missione geologica nel Tigrai-1. La serie dei terreni, Rendiconti Reale Accademia d'Italia, Centro Studi per l'Africa Orientale Italiana, Rome, 3, 362pp.
59. Mohr, P.A. 1967. The Ethiopian Rift System. Bulletin of Geophysical Observatory, Addis Ababa, 11, 1-65.
60. Mohr, P. 1987. Patterns of faulting in the Ethiopian Rift Valley. Tectonophysics, 143, 169-179.
61. Pan, M., Sjöberg, L.E., Asenjo, E., Alemu A. & Asfaw, L.M. 2002. An analysis of the Ethiopian Rift Valley GPS campaigns in 1994 and 1999. Journal of Geodynamics, 33, 333-343.
62. Redfield, T.F., Wheller, W.H. & Often, M. 2003. A kinematic model for the development of the Afar Depression and its paleogeographic implications. Earth and Planetary Science Letters, 216, 383-398.
63. Renne, P.R., WoldeGabriel, G., Hart, W.K., Heiken, G. & White, T. 1999. Chronostratigraphy of the Miocene-Pliocene sagantole formation, Middle Awash Valley, Afar Rift, Ethiopia. Geological Society of America Bulletin, 111, 869-885.
64. Robertson, E.C. 1983. Relationship of fault-displacement to gouge and breccia thickness. Transactions of the American Institute of Mining Engineering, 35, 1426-1432.
65. Rubin, A.M. & Gillard, D. 1998. Dike-induced earthquakes: Theoretical considerations. Journal of Geophysical Research, 103, 10,017-10,030.
66. Scholz, C.H. 1987. Wear and gouge formation in brittle faulting. Geology, 15, 493-495.
67. Sibson, R.H. 1977. Fault rocks and fault mechanisms. Journal of the Geological Society of London, 133, 191-213.
68. Tiercelin, J.J., Taieb, M. & Faure, H. 1980, Continental sedimentary basins and volcano-tectonic evolution of the Afar Rift. In: Carrelli, A. (ed.) Geodynamic evolution of the Afro-Arabian Rift system. Atti Convegno Accademia Nazionale dei Lincei, 47, 491-504.
69. Walperdorf, A., Vigny, C., Ruegg, J.C., Huchon, P., Asfaw, L.M. & Al Kirbash, A. 1999. 5 years of GPS observations of the Afar triple junction area. Geodynamics, 28, 225-236.
70. Wise, D.U., Dunn, D.E., Engelder, J.T., Geiser, P.A., Hatcher, R.D., Kish, S.A., Odom, A.L. & Schamel, S. 1984. Fault-related rocks: suggestions for terminology. Geology, 12, 391-394.
71. WoldeGabriel, G., Aronson, J. & Walter, R. 1990. Tectonic development of the Main Ethiopian rift. Geological Society of America Bulletin, 102, 439-458.
72. Wolfenden, E., Ebinger, C., Yirgu, G., Deino, A. & Ayalew, D. 2004. Evolution of the northern Main Ethiopian rift: Birth of a triple junction. Earth and Planetary Science Letters, 224, 213-228.