Holocene Tectonic Activity in West Africa Dated by Archaeologic Methods: Discussion

Bondesen, E; Smit, Arnold

doi:10.1130/0016-7606(1972)83[1193:htaiwa]2.0.co;2

Cited by 14 publications

(4 citation statements)

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“…According to him, these extensional stresses may be contributing to seismic activity within the West Africa zone and therefore could make some faults within the zone likely active. Previous studies (Tevendale 1957 ; Burke 1969 b; Bondesen and Smit 1972 ; Ahmed et al 1977 ) also related seismic activities with tectonic elements in SE Ghana.…”

Section: Seismicity In Ghanamentioning

confidence: 87%

Probabilistic seismic hazard assessment of southern part of Ghana

2017

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This paper presents a seismic hazard map for the southern part of Ghana prepared using the probabilistic approach, and seismic hazard assessment results for six cities. The seismic hazard map was prepared for 10% probability of exceedance for peak ground acceleration in 50 years. The input parameters used for the computations of hazard were obtained using data from a catalogue that was compiled and homogenised to moment magnitude (Mw). The catalogue covered a period of over a century (1615–2009). The hazard assessment is based on the Poisson model for earthquake occurrence, and hence, dependent events were identified and removed from the catalogue. The following attenuation relations were adopted and used in this study—Allen (for south and eastern Australia), Silva et al. (for Central and eastern North America), Campbell and Bozorgnia (for worldwide active-shallow-crust regions) and Chiou and Youngs (for worldwide active-shallow-crust regions). Logic-tree formalism was used to account for possible uncertainties associated with the attenuation relationships. OpenQuake software package was used for the hazard calculation. The highest level of seismic hazard is found in the Accra and Tema seismic zones, with estimated peak ground acceleration close to 0.2 g. The level of the seismic hazard in the southern part of Ghana diminishes with distance away from the Accra/Tema region to a value of 0.05 g at a distance of about 140 km.

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Section: Seismicity In Ghanamentioning

confidence: 87%

Probabilistic seismic hazard assessment of southern part of Ghana

2017

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“…Correlations between geological structures onshore and clustering of earthquake epicenters clearly link neotectonic activity with Pan-African structures. However, active displacement apparently occurs along steeper fault zones, at least at shallow depths, with normal-sense slip rather than the lowangle reverse slip interpreted from onshore Pan-African structures (Bondesen and Smit, 1972;. We conclude from the data presented that: (i) neotectonic activity along Pan-African structures may involve tectonic inversion, and (ii) tectonic reactivation along the seismogenic PF zone may have occurred in the Paleozoic era and again more recently along PS.…”

Section: Discussionmentioning

confidence: 83%

“…Fig. 3B is a plot of epicenters of two historical earthquakes and selected recent events from the local network and teleseismic data on a new tectonic map of the Dahomeyide orogen (Bondesen and Smit, 1972;. The selected recent events plotted are those for which epicenters for short-term earthquake cycle (e.g., consisting of aftershocks occurring over a few weeks) were located close to each other.…”

Section: Pan-african Structures and Seismicitymentioning

confidence: 99%

The role of Pan-African structures in intraplate seismicity near the termination of the Romanche fracture zone, West Africa

Attoh

Brown

Haenlein

2005

Journal of African Earth Sciences

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“…Previous studies which correlated seismic activities with tectonic elements in SE-Ghana related seismic events with faults mapped in the 1970s and prior (Tevendale, 1957;Burke, 1969b;Bondesen and Smit, 1972;Ahmed et al, 1977). New data on the occurrence of neotectonic faults was produced when a Technical Cooperation Project between the Geological Survey Department of Ghana (GSD) and Federal Institute of Geosciences and Natural Resources, Germany (BGR) conducted a detailed mapping exercise with the objective to contribute geological data for regional planning and geo-hazard assessment in the Accra area .…”

Section: Previous Investigationsmentioning

confidence: 93%