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Umar Afegbua Kadiri

Umar Afegbua Kadiri
Centre for Geodesy and Geodynamics, Toro, Bauch State, Nigeria · Seismology Division

PhD

About

17
Publications
10,511
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91
Citations
Introduction
Geophysics (Fault delineation) Seismology (Ambient noise tomography, PSHA, Site response) Currently working on seismotectonics in West Africa and site response studies for critical facilities

Publications

Publications (17)
Article
Full-text available
The aim of this study is to investigate the actual causes of earth tremors in Central Nigeria using geophysical technique. Since 1933 till date (over 88 years), small to moderate magnitude earthquakes have either been observed or instrumentally recorded in Nigeria. However, the specific causes of the intra plate earthquakes in Nigeria is still not...
Article
Full-text available
The aim of this study therefore, is to estimate site response parameters namely: predominant frequency (fr), amplification factor (Ao), vulnerability index (Kg) and average Shear-wave Velocity (V ), to assist in seismic site S classification in the Lower Benue Trough (LBT), Nigeria. The noise data used were collected from seismic stations in Nigeri...
Article
Full-text available
Regardless of the doubt caused by some rounds on the impossibility of earthquake forecast, more and more countries, even at the highest governmental levels, realize that doing nothing is the ostrich position of dread before the real difficulties associated with the creation of a real forecasting system. Nigeria in times past was believed to be asei...
Article
Full-text available
Although probabilistic seismic hazard assessment (PSHA) has been carried out in a few countries in West Africa (WA), large-scale PSHA is still lacking in the region. Dearth of earthquake data, sparse or complete absence of a network of seismographic stations, lack of skilled geoscientists, absence of appropriate policies to encourage PSHA, and so o...
Article
No in-depth seismic hazard study for West Africa (WA) has ever been conducted, as the regional earthquake catalogues are incomplete. Such lack of comprehensive seismic hazard study for the region has negatively affected the planning and development of critical infrastructure and disaster risk management. Therefore, this study aims to bridge the kno...
Article
Full-text available
The Compressional, P-and shear, S-wave velocity ratios (Vp/Vs),have been computed from five local earthquakes located in Nigeria from 2009 to 2018. Using the multicomponent seismic data from the Nigerian National Network of Seismographic Stations (NNNSS), the waveform data obtained from Toro, Ife, Nsukka, Abakaliki and Kaduna seismic stations, were...
Article
Knowledge of seismic hazard is an integral part of strategic planning for critical infrastructural development. This is lacking in Nigeria that is seriously considering the construction of nuclear power plants, dams, bridges etc. to meet increasing need by its exploding population. This study therefore, is aimed at computing critical earthquake haz...
Article
Full-text available
Preliminary evaluation of the performance of the Broadband Seismic Stations in Nigeria has been carried out. The aim is to test the recording capability, data quality for research and estimate the signal to noise ratios of the stations. The methodology involves the noise analysis for the Kaduna station located on basement complex in the northern pa...
Article
Full-text available
This paper reviews the communication technologies employed in the Nigeria National Network of Seismographic Stations (NNNSS) operated by the Centre for Geodesy and Geodynamics with the purpose of eveluating the advantages and the drawbacks inherent in the various technologies for reliable seismic data transmission. The traditional Public Switched T...
Article
Full-text available
The aim of this research is to contribute to insights on how the tectonic activities in the MAR may have been influencing observed seismic activities in the region of West Africa. The seismic activities in parts of Mid-Atlantic Ridge (MAR) have been investigated with respect to seismicity in the West African region, using Statistical and Probabilis...
Article
Full-text available
The study investigated the impact of family factors on women entrepreneurship in Kogi State, North Central Nigeria. The family is a source of finance and human resources, social and cultural values, and role modelling. While studies have shown that family background is one of the numerous determinants of entrepreneurial intention, we know little ab...
Article
Full-text available
The aim of this study is essentially to predict compressional wave velocity (Vp) from electrical resistivity (R) observations in parts of the South-South and South-East Nigeria; and also to compute the formation density (p) of consolidated layers in the subsurface and subsequently establish a relationship between p and Vp for the entire region cove...
Article
Full-text available
Seismic events had been recorded instrumentally and also historically from 1933 to 2011 in Nigeria. These pockets of activities were felt in different parts of the country with the southwest region recorded the highest number of events and moderate magnitudes of between 4 and 4.5. The geology and the structural tectonic setting of the region in que...
Article
Full-text available
Preliminary investigation of Toro and Nsukka stations from the Nigerian National Network of Seismographic Stations (NNNSS) with respect to Signal-to-Noise-Ratios (SNR) has been performed from noise observation and numerically. The results showed that Toro has higher SNR compared to Nsukka. Six months data collected from the stations in 2012 were us...
Article
Full-text available
Nigeria is not situated where major seismic activities are observed in the world; but the country has experienced pockets of tremors comprising of magnitudes ranging from 4.3 to 4.5. The vibrations of the September 11, 2009 event with magnitude 4.4 and epicenter at Allada, Benin Republic, 128 km west of Lagos, Nigeria, was felt in parts of Ibadan a...

Questions

Question (1)
Question
I am trying to understand better the causes of intra-plate earthquakes on a stable continental crust

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Projects

Projects (2)
Project
The main goal of this project is to unravel the composition and evolution of these volcanoes in space and time whereby the baseline data generated will further be useful for risk assessment that will reduce the impact of an eventual volcanic eruption and improved land use alternatives in Nigeria.
Project
-Microzonation -accessing natural frequency on sedimentary basins -Expected site amplification from ground shakings -Vulnerability index and damaging potentials of earthquakes to structures