Ghana’s experience in the establishment of a national digital seismic network observatory

Ahulu, Sylvanus Tetteh; Danuor, Sylvester K.

doi:10.1007/s10950-015-9486-z

Cited by 5 publications

(8 citation statements)

References 10 publications

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“…Seismic events in Ghana are monitored by the National Digital Seismic Network Observatory (NDSO) established by the government of Ghana. The database consists of natural and artificial seismic activities in 2012 (Ahulu and Danuor 2015). The selected dams located in this study region have moderate seismicity (Fig.…”

Section: Introductionmentioning

confidence: 99%

Seismic risk analysis for large dams in West Coast basin, southern Ghana

Irinyemi

2021

J Seismol

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Dams are parts of the critical infrastructure of any nation, the failure of which would have a high-risk potential on the people and properties within the dam vicinity. Ghana is one of the most seismically active regions in West Africa and has at least 5 large dams across the region, constructed in strategic locations. The area is characterised by low-to-moderate seismicity, yet historical events suggest that major earthquakes that are potentially damaging have occurred in the study basin. This paper summarises the method used to analyse seismic risk and discusses the seismic hazards of three large dams across the study basin based on the seismicity at the dam sites and their risk due to structural properties and the location of each dam. The peak ground acceleration (PGA) values for the dam sites estimated are within the range of (0.31 g and 0.52 g) for 10,000 years return period. The study shows that one large dam has a high-risk class in the basin. This dam should be inspected and analysed for its seismic safety and people’s protection in the downstream paths.

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Section: Introductionmentioning

confidence: 99%

Seismic risk analysis for large dams in West Coast basin, southern Ghana

Irinyemi

2021

J Seismol

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“…Ahulu and Danuor (2015) [ 10 ] presented a comprehensive study of the establishing of a National Digital Seismic Network Observatory in Ghana. Per the authors, the approach involved a network system of six digital stations that transmitted data through a satellite to a central observatory.…”

Section: Resultsmentioning

confidence: 99%

“…The monitoring system also faces several challenges, including limited funding, a lack of advanced technology, and a shortage of trained personnel. Ahulu and Danuor (2015) [ 10 ] studied the nature of Ghana's digital seismic stations and were of the view that it was very expensive to pay for both local internet access and the satellite communication services needed for real-time transmission, which are rented from a US corporation. The authors also reiterated the lack of trained professionals to oversee and manage the network system's mechanical and technological aspects.…”

Section: Discussionmentioning

confidence: 99%

“…It extends through Kpong, Ho, and the Republics of Benin and Togo. Seismic studies have established that Coastal Boundary Fault is the most active fault system across the country [ 10 ]. At a distance 3–5 km from the coast, the Coastal Boundary Fault strikes at a north-northeasterly angle of 60–70°, down throwing the block south of it over a distance of several kilometers [ 2 ].…”

Section: Geological Settingmentioning

confidence: 99%

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Seismic activities in Ghana: A systematic review

Asare-Bediako,

Boateng,

Opoku

et al. 2024

Heliyon

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“…Western Africa, on the other hand, has a sparse distribution of real-time seismic stations. Even recently deployed small-aperture seismic arrays located in Western Africa, e.g., Nigeria (Afegbua et al, 2011) and Ghana (Ahulu and Danuor, 2015), do not currently archive data on global waveform databases and only a few are real-time. Therefore, we use a single-station location method that is based on polarization analysis using eigen-decomposition of ground displacement (Vidale, 1986;Park et al, 1987;Bai and Kennett, 2000;Simons et al, 2009) for event detection, seismic phase identification (Earle, 1999), and source localization (Böse et al, 2017).…”

Section: Single-station Seismologymentioning

confidence: 99%

On the Origin of Orphan Tremors and Intraplate Seismicity in Western Africa

Olugboji

Shirzaei

et al. 2021

Front. Earth Sci.

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On September 5–7, 2018, a series of tremors were reported in Nigeria’s capital city, Abuja. These events followed a growing list of tremors felt in the stable intraplate region, where earthquakes are not expected. Here, we review available seismological, geological, and geodetic data that may shed light on the origin of these tremors. First, we investigate the seismic records for parent location of the orphan tremors using a technique suitable when a single-seismic station is available such as the Western Africa region, which has a sparse seismic network. We find no evidence of the reported tremors within the seismic record of Western Africa. Next, we consider the possibility of a local amplification of earthquakes from regional tectonics, reactivation of local basement fractures by far-field tectonic stresses, post-rift crustal relaxation, landward continuation of oceanic fracture zones, or induced earthquakes triggered by groundwater extraction. Our assessments pose important implications for understanding Western Africa’s intraplate seismicity and its potential connection to tectonic inheritance, active regional tectonics, and anthropogenic stress perturbation.

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Ghana’s experience in the establishment of a national digital seismic network observatory

Cited by 5 publications

References 10 publications

Seismic risk analysis for large dams in West Coast basin, southern Ghana

Seismic risk analysis for large dams in West Coast basin, southern Ghana

Seismic activities in Ghana: A systematic review

On the Origin of Orphan Tremors and Intraplate Seismicity in Western Africa

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