Historical seismicity in oceans from sailors’ testimonies

Rouland, D.; Legrand, D.; Cisternas, A.; Streng, Daniel; Gir, Roopa; Souriau, Annie

doi:10.1007/s10950-015-9523-y

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…These fracture zones are often interpreted as Atlantic passive margins, the site of seismic strain rates and active deformation [1] [2] [3]. The most seismically active regions are located along the transform faults [4] [5]. The Atlantic Ocean has extended along these faults, especially in its southern part where there is junction of the oceanic fracture zones with the West African continental margin in the Gulf of Guinea (GOG) and continental faults [6].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Seismic Hazard Assessment in West Africa Based on Incomplete Seismic Catalogs

Mbossi¹,

Ndibi²,

Nguet³

et al. 2021

OJER

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West Africa is considered a region of low seismicity. However, the monitoring of earthquake activity by local seismic arrays began very early (as early as 1914) in West Africa but seismic catalogs are very incomplete. In 1991, Bertil studied the seismicity of West Africa based on networks of seismic stations in Ivory Coast and neighboring countries. The reference work of Ambraseys and Adams as well as the recent earthquakes given by the international data centres on the seismicity of West Africa were also used for the computations of earthquake hazard parameters. Different earthquake event data have been compiled and homogenised to moment magnitude (M w ). The obtained catalog covers a period of over four centuries (1615-2021) and contains large historical events and recent complete observations. The complete catalog part has been subdivided into four complete subcatalogs with each a level of completeness. The minimum magnitude and the maximum observed magnitude are equal to 2.89 and 6.8 respectively for the whole catalog. The seismic code software developed by Kijko was used to calculate the earthquake hazard parameters. The results give a b value of 0.83 ± 0.08 for the whole period and preliminary seismic hazards curves are also plotted for return periods 25, 50 and 100 years. This is a good and practical example showing that this procedure can be used for seismic hazard assessment in West Africa.

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Section: Introductionmentioning

confidence: 99%

Preliminary Seismic Hazard Assessment in West Africa Based on Incomplete Seismic Catalogs

Mbossi¹,

Ndibi²,

Nguet³

et al. 2021

OJER

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show abstract

“…Of the 521 previously unknown events, about 450 occur along plate boundaries or in other tectonically active zones. Many are located along the ridge-transform system in the Southern Hemisphere, where it is known that traditional detection methods occasionally fail to detect regular M ϳ 5 earthquakes (7,12). Of the remaining earthquakes, 46 are located in glaciated areas.…”

Section: Glacial Earthquakesmentioning

confidence: 99%

Glacial earthquakes

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Historical seismicity in oceans from sailors’ testimonies

Cited by 2 publications

References 32 publications

Preliminary Seismic Hazard Assessment in West Africa Based on Incomplete Seismic Catalogs

Preliminary Seismic Hazard Assessment in West Africa Based on Incomplete Seismic Catalogs

Glacial earthquakes

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