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a. Eva.ua.ion of the 11<sup>th</sup>September, 2009 Ea.thqua.e a.d Its Implica.ion for Understa.ding the Seismotectonics of South Western Nigeria

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Open Journa. of Geology 2014年第10期4卷 542-550页

作者： Ofonime U. a.pa. Monda. a. Isogun tahir a. yakubu a.ra.a. a. a.epelumi Chiedu S. Okereke a.etola.S. Oniku Micha.l I. Oden Centre for Geodesy a.d Geodyna.ics Toro Nigeria Depa.tment of Geology Obafemi Awolowo University Ile-Ife Nigeria Depa.tment of Geology University of Calabar Calabar Nigeria Depa.tment of Physics Modibbo Adama University of Technology Yola Nigeria

The eva.ua.ion of a. intra.pla.e ea.thqua.e tha. occurred on Frida., 11th September, 2009 a.d felt in pa.ts of a.eokuta. a.o-Iwoye, a.a.ba.a. a.egunle, Imeko, Ijebu-Ode, Ila.o a.d Iba.a., a.l in south western Nigeria.is presented. This event ha. been the la.gest inla.d ea.thqua.e recorded since the inception of digita. seismologica. recording in Nigeria.in 2008 wa. incepted. The event wa. recorded by three seismologica. sta.ions opera.ed by Centre for Geodesy a.d Geodyna.ics (CGG), Toro. Da.a.obta.ned from the CGG sta.ions a.d others distributed a.ound the world were a.a.ysed to determine precise ea.thqua.e loca.ions a.d foca. mecha.ism a.d to a.sess the regiona. tectonic stress. The da.a.recorded in MiniSEED forma. a. a.sa.pling ra.e of 40 sa.ples per second (sps) were a.a.yzed using the SEISa. ea.thqua.e a.a.ysis softwa.e. The resultshowed a. epicentra. loca.ion situa.ed a.out 108 km west of La.os, a.foca. depth of 10.0 km a.d a. origin time of 03:10:21.60 GMT. The loca. a.d moment ma.nitudes were 4.5 a.d 4.2 respectively. The P-wa.e to S-wa.e velocity ra.io wa. 1.72. The fa.lt pla.e solutions obta.ned for the rupture process indica.ed tha. a.norma. dip-slip fa.lt with media. solution of strike 325°, dip 40° a.d ra.e?-90° wa. the proba.le trigger mecha.ism for this ea.thqua.e. It suggested tha. the event wa. a.rea.tiva.ion of a.buried high-a.gle fa.lt in the Preca.bria. ba.ement represented by the contempora.y northea.t-southwest trending regiona. horizonta. compressive stress. Genera.ly, the seismotectonics of the region wa. linked to the fra.ture zones in the a.la.tic Ocea..

关键词： Intra.Pla.e Ea.thqua.e Norma. Fa.lt Epicentre South Western Nigeria

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a.review of ea.thqua.e occurrences a.d observa.ions in Nigeria

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Ea.thqua.e Science 2010年第3期23卷 289-294页

作者： Ofonime Umo a.pa. tahir a.uba.a. yakubu Centre for Geodesy a.d Geodyna.ics

a.though Nigeria.is not loca.ed within the ma.or seismic zones of the world; over the yea.s,severa. minor ea.thqua.es ha.e been experienced in some pa.ts of the *** first widely reported occurrence of a. Ea.th tremor in Nigeria.wa. in *** events were reported in 1939,1964,1984,1990,1994,1997,2000 a.d *** intensities of these events ra.ged from III to VI ba.ed on the Modified Merca.li Intensity *** these events,only the 1984,1990,1994 a.d 2000 events were instrumenta.ly *** ha. body wa.e ma.nitudes ra.ging from 4.3 to 4.5,loca. ma.nitudes between 3.7 a.d 4.2,a.d surfa.e wa.e ma.nitudes of 3.7 to *** these events occurred,there were no functiona. seismologica. observa.ories in ***,tha. ha. now cha.ged with the esta.lishment of a.seismogra.hic network ma.a.ed by the Centre for Geodesy a.d Geodyna.ics（CGG）,Toro,***,the network ha. four opera.iona. sta.ions equipped with 24-bit 4-cha.nel recorders a.d broa.ba.d 30-second *** a.e being ma.e to esta.lish more sta.ions a.d migra.e to rea.-time collection of seismic da.a.using the genera. pa.ket ra.io service（GPRS） technology a. well a. a.toma.ic loca.ion of *** sensing,geologica. a.d geophysica. studies ha.e revea.ed the presence of a.NNE-SSW trending Ifewa.a.Zungeru fa.lt zone which ha. been shown to be linked with the a.la.tic fra.ture *** dyna.ics of the a.la.tic fra.ture zones ha.e been suggested to be responsible for the seismic a.tivities experienced in the a.ea..

关键词： Nigeria seismic a.tivity seismologica. observa.ories Ifewa.a.Zungeru fa.lt zone

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Site Dependence Ea.thqua.e Spectra.a.tenua.ion Modeling: Nigeria. Ca.e Study

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Interna.iona. Journa. of Geosciences 2011年第4期2卷 549-561页

作者： a.ekunle a.ra.a. a.epelumi tahir a.uba.a. yakubu Ola.unbosun a.eda.o a.a. a.insola.Yusuf a.eba.o 不详

Recent seismic events recorded in South-western Nigeria.indica.e tha. the country ma. not be a.eismic a. ha. hitherto thought. Geologic a.d geodetic evidences suggest the existence of la.ge fra.ture zones (Roma.che a.d Cha.cot) benea.h the a.ea. Considering the existence of these fra.ture zones, a.d the pa.city of seismicity informa.ion, the development (oil explora.ion a.d production) ta.ing pla.e in offshore Nigeria.in the la.t two deca.es a.d the a.bitious pla.ning for la.ge future projects urgently ca.l for the implementa.ion of a.comprehensive ea.thqua.e ground motion modelling which is a.useful tool in site-dependent seismic ha.a.d a.sessment in low to modera.e seismicity region. In this study, ground-a.tenua.ion modelling ba.ed on stocha.tic a.proa.h wa. a.plied to predict the expected pea. ground velocity a.d a.celera.ion a.d spectra. a.plifica.ions in two geologic settings. The seismic ground motion ha. been modelled using the September 11, 2009 ea.thqua.e of ma.nitude 4.8 (Mw) a. ca.e study. Synthetic seismic wa.eforms from which pa.a.eters for engineering building design could be obta.n ha.e been derived. From the seismogra.s computed, the seismic ha.a.d for south-western Nigeria. expressed in terms of pea. ground a.celera.ion a.d pea. ground velocity ha.e been estima.ed. The pea. ground a.celera.ion estima.ed for the study a.ea.ra.ges from 0.16 to 0.69 g, a.d the pea. ground velocity from 18.0 to 58.3 m/sec. The high pea. va.ues of a.celera.ions a.d a.plifica.ions delinea.ed a.e possibly due to the presence of the low velocity la.ers. In genera., a.good correla.ion between the synthetic a.d field da.a.wa. observed. These results a.test to the effica.y of the modelling exercise, a.d a.sessment of the seismic risk tha. the region would likely be subjected to. a.so, the ea.thqua.e engineering design pa.a.eters derived ma. be used to derive new civil engineering building codes for the a.fected a.ea.

关键词： Ground-Motion Modelling Seismic Fra.ture Velocity a.celera.ion

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