A review of earthquake occurrences and observations in Nigeria
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Although Nigeria is not located within the major seismic zones of the world; over the years, several minor earthquakes have been experienced in some parts of the country. The first widely reported occurrence of an Earth tremor in Nigeria was in 1933. Other events were reported in 1939, 1964, 1984, 1990, 1994, 1997, 2000 and 2006. The intensities of these events ranged from III to VI based on the Modified Mercalli Intensity Scale. Of these events, only the 1984, 1990, 1994 and 2000 events were instrumentally recorded. They had body wave magnitudes ranging from 4.3 to 4.5, local magnitudes between 3.7 and 4.2, and surface wave magnitudes of 3.7 to 3.9. When these events occurred, there were no functional seismological observatories in Nigeria. However, that has now changed with the establishment of a seismographic network managed by the Centre for Geodesy and Geodynamics (CGG), Toro, Nigeria. Presently, the network has four operational stations equipped with 24-bit 4-channel recorders and broadband 30-second seismometers. Efforts are being made to establish more stations and migrate to real-time collection of seismic data using the general packet radio service (GPRS) technology as well as automatic location of events. Remote sensing, geological and geophysical studies have revealed the presence of a NNE-SSW trending Ifewara-Zungeru fault zone which has been shown to be linked with the Atlantic fracture system. The dynamics of the Atlantic fracture zones have been suggested to be responsible for the seismic activities experienced in the areas.
Key wordsNigeria seismic activity seismological observatories Ifewara-Zungeru fault zone
- Adekoya J A (1984). Earthquakes in Nigeria. Sunday Sketch Newspaper, August 26, 13.Google Scholar
- Ajakaiye D E, Daniyan M A, Ojo S B and Onuoha K M (1987). The July 28, 1984 southwestern Nigeria earthquake and its implications for the understanding of the tectonic structure of Nigeria. In: Wassef A M, Boud A and Vyskocil P. Recent Crustal Movements in Africa. Journal of Geodynamics7: 205–214.Google Scholar
- Ajakaiye D E, Olatinwo M D and Scheidegger A E (1988). Another possible earthquake near Gombe in Nigeria on the 18–19 June 1985. Bull Seism Soc Amer78(2): 1 006–1 010.Google Scholar
- Ananaba S E (1991). Dam sites and crustal megalineaments in Nigeria. ITC Journal1: 26–29.Google Scholar
- Anifowose A Y B, Odeyemi I B and Borode A M (2006). The tectonic significance of the Ifewara-Zungeru megastructure in Nigeria. In: Teme S C and Ezeigbo C U. Proceedings of the 1st International Workshop on Geodesy and Geodynamics. Centre for Geodesy and Geodynamics, Toro, Nigeria, 17–28.Google Scholar
- Anifowose A Y B, Oladapo M I, Akpan O U, Ologun C O, Adeoye-Oladapo O O, Tsebeje S Y and Yakubu T A (2010). Systematic multi-technique mapping of the southern flank of Iwaraja fault, Nigeria. Jour of Applied Science and Technology15(1–2): 70–76.Google Scholar
- Elueze A A (1990). Geological setting of Proterozoic schist belts and relationship to crustal movement. In: Ofoegbu C O, Osemekhain J E A, Ekwelibe P, Ezeife N, Ejezie S and Obiaga T I. Proceedings of the 5th International Seminar and Exhibition on Earthquake Prognostics. National Technical Committee on Earthquake Phenomena, Lagos, Nigeria, 108–114.Google Scholar
- Elueze A A (2003). Evaluation of the 7 March 2000 earth tremor in Ibadan area, southwestern Nigeria. Jour Min Geol39(2): 79–83.Google Scholar
- Francheteau J and Le Pichon X (1972). Marginal fracture zones as structural framework of continental margins in the South Atlantic Ocean. J Geophys Res56: 991–1 007.Google Scholar
- International Seismological Centre (ISC) (2009). Rectangular selection. 2009-09-12, http://www.isc.ac.uk/search/bulletin/rectang.html.
- Kogbe C A and Delbos L (1984). The recent Guinea earthquake: Probable origin and geographic implications. Pangea2: 17–19.Google Scholar
- Odeyemi I B (1989). Precambrian crustal fractures as possible sites of seismic activity in Nigeria: Ifewara fault as a case example. In: Ajakaiye D E, Ojo S B, Daniyan M A and Abatan A O. Proceedings of the National Seminar on Earthquakes in Nigeria. National Technical Committee on Earthquake Phenomena, Lagos, Nigeria, 225.Google Scholar
- Odeyemi I B (2006). The Ifewara fault in southwestern Nigeria: Its relationship with fracture zones along the Nigerian coast. Centre for Geodesy and Geodynamics, Toro, Bauchi State, 1–13.Google Scholar
- Ojo O M (1995). Survey of occurrences in Nigeria of natural and man-made hazards related to geological processes. In: Onuoha K M and Offodile M E. Proceedings of the International Workshop on Natural and Man-made Hazards in Africa. Nigerian Mining and Geosciences Society, Jos, Nigeria, 10–14.Google Scholar
- Onuoha K M (1989). Historical perspectives of earthquakes in West Africa. In: Ajakaiye D E, Ojo S B, Daniyan M A and Abatan A O. Proceedings of the National Seminar on Earthquakes in Nigeria. National Technical Committee on Earthquake Phenomena, Lagos, Nigeria, 129–141.Google Scholar
- Osagie E O (2008). Seismic activity in Nigeria. The Pac Jour Sci and Tech9(2): 1–6.Google Scholar
- Ottemoller L, Voss P and Havskov J (2009). SEISAN: The Earthquake Analysis Software for Windows, Solaris, Linux and Macosx (version 8.2.1). 2009-10-11, http://seis.geus.net/software/seisan/seisan.pdf.
- Ugodulunwa F X O, Ajakaiye D E, Guiraud M and Hossan M T (1986). The Pindiga and Obi fractures — Possible earthquake sites in Nigeria. In: Proceedings of the 3rd International Conference on Current Research in Geophysics and Geophysical Research in Africa. Faculty of Natural Sciences, University of Jos, Jos, Nigeria, 6.Google Scholar