Empirical relationships of earthquake magnitude scales and estimation of Guttenberg–Richter parameters in gulf of Guinea region

Eluyemi, Ayodeji Adekunle; Baruah, Santanu

doi:10.1016/j.sciaf.2019.e00161

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…An observation from our work gave a better explanation to the migration of the African plate as follows: The study region is located primarily around the plate boundary, between the South American and the African plates, it is intuitive to infer that the driving or splitting forces of the two continental plates begins from this zone. Furthermore, the inferred extensional stress regime from this work also coincides with the orientation of the movement of the African plate towards the Euroasia plate as contained in Kreemer et al (2014) [25] . Hence the explanation contained in this study for the ENE-WSW movement of the African plate towards the Eurasia plate.…”

Section: Discussionsupporting

confidence: 84%

“…Epicenters and their computed focal mechanism solutions (FMSs) nearly suggest that the occurrences of the earthquake in the Gulf of Guinea relative to the adjoining region represent accommodation of deformation [18,26,27] .…”

Section: Discussionmentioning

confidence: 99%

“…A thorough inspection of focal mechanisms solutions reveals that earthquakes occur mostly on strike-slip and normal fault systems in the Gulf of Guinea region. For the quantitative assessment of the quality and variability of the fault plane solutions utilized in this work, we follow the approach of Davis and Frohlich [13,17,18] .…”

Section: Fault Plane Solution Datamentioning

confidence: 99%

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Tectonic activity in Gulf of Guinea and Sub-Sahara West Africa: A validation of Freeth (1977) using focal mechanism solutions

Adekunle Eluyemi

2024

EAR

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Fault plane solutions for a group of 104; 4.0 ≤ Mw ≤ 7.1 earthquakes between January 1979 and December 2016, extracted from the Global Centroid Moment Tensor Project catalog. Were used to investigate the regional tectonic stress regime of the Gulf of Guinea region. The idea is to validate the theory of membrane tectonics put forward by Freeth (1977)[1] in which the tectonic of the Gulf of Guinea and the sub-Sahara West Africa region were described based on Freeth (1977)[1]. The tectonic of the Gulf of Guinea and the sub-Sahara West Africa region are based on the movement of the African plate, we emphasized the use of rigorous statistical tests to decide on the quality and variability of the earthquake focal mechanisms (FMSs) utilized for the stress tensor inversion analysis. To constrain our analysis, we have applied both the Algorithm of Michael and Gauss technique in our stress tensor inversion analysis of FMS obtained from the region, and the results are found to be coherent and in good agreement with each other. Both Michael (1984)[2] and Zalohar and Vrabec (2007)[3] techniques show that the regional tectonic stress regime of the Gulf of Guinea and the sub-Sahara West Africa is extensional, which is in good agreement with the work of Freeth (1977)[1]. However, our investigation concluded that the orientation of the extensional stress regime is the same as the orientation of the movement of the African plate, which is towards the Euro-Asia plate.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Fault Plane Solution Datamentioning

confidence: 99%

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Tectonic activity in Gulf of Guinea and Sub-Sahara West Africa: A validation of Freeth (1977) using focal mechanism solutions

Adekunle Eluyemi

2024

EAR

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“…It is quite obvious that the intraplate seismicity of Nigeria is not understood yet. A functional seismic network station in Nigeria would give crustal information about the Nigerian terrain as well as revelations of some seismogenic sources, which would ultimately consolidate on some recent seismological studies conducted by some researchers: Eluyemi and Baruah ( 2016 [6][7][8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 91%

Instrumentation of the Nigeria network of seismological stations

Adekunle Eluyemi

2024

EAR

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“Living in fear of Nigeria biggest Earthquake” is a sub-heading of the Punch daily newspaper of Nigeria, dated, 21st of August, 2016, reported the earthquake/tremor recently witnessed in the ancient town of Saki, accompanied by a series of aftershock events that lasted for about three (3) months (March/May, 2016) southwest Nigeria[1]. Similarly, roughly five (5) years later, another series of earthquakes/tremors occurred again in Saki town, which was reported by an online news vendor named “Ripples Nigeria” dated September 8, 2021, under the sub-heading of “earth tremor rocks Saki in Oyo state”[2]. However, these events were not captured nor recorded by any of the functional seismological stations in Nigeria. The nearest seismological station located at the Obafemi Awolowo University (OAU) Ile-Ife, also failed to capture the events. We therefore seek to examine the instrumentation of the Nigerian National Network of Seismographic Stations. This is necessary to understand the functionalities and the capabilities of the deployed seismometers in each of the seismic stations. Therefore, we evaluated the bandpass limit of the seismic wave frequency for the respective seismic stations in Nigeria through the computation of the amplitude-frequency response curve, phase response curve, and count to cm/sec.

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“…Generally, at the onset of an earthquake, magnitude is the first source parameter to be quantified to determine earthquake strength [18]. The magnitude can be utilized to study the pattern of earthquake occurrence [19].…”

Section: Scenariomentioning

confidence: 99%

Tsunami Mitigation Strategy at Watu Ulo Beach Based on Numerical Modeling Using Delft3D-Flow

Sofiana

Wiyono²,

Nurtjahjaningtyas³

2022

UKaRsT

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The coastal area of Watu Ulo Beach in Jember has great resource potential but also the potential for major disasters, such as a tsunami. Tsunamis can cause casualties and destroy buildings. Thus, it is important to assess the possibility of future tsunami disasters. This study aims to simulate a tsunami at Watu Ulo Beach using Delft3D-Flow to analyze the possibility of affected areas. The tsunami modeling is based on two simulations, namely Scenario 1 as model validation using the characteristics of the 1994 Banyuwangi earthquake. Model validation calculation uses the MAPE method <10%. Scenario 2, modeling the southern Java megathrust earthquake, was analyzed to obtain the time and wave height as well as tsunami run-up and inundation, visualizing the area affected by Watu Ulo Beach. The simulation results show that the tsunami wave height at Watu Ulo Beach reached 12.57 m with a travel time of 29 minutes. The run-up elevation was 9.21 m, and the inundation distance was 2.38 km from the Watu Ulo coastline, indicating that the tsunami caused substantial damage. As an area affected by the tsunami, Sumberejo Village has an inundation area of 634.68 ha, and Sabrang Village has an area of 250.03 ha. The temporary evacuation location for Watu Ulo Beach is set at Tanjung Papuma Street via the shortest route of 0.57 km from the assembly point. Based on the results of this study can be used as a reference for determining temporary evacuation routes and locations for tsunami disaster mitigation in coastal areas.

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Empirical relationships of earthquake magnitude scales and estimation of Guttenberg–Richter parameters in gulf of Guinea region

Cited by 6 publications

References 29 publications

Tectonic activity in Gulf of Guinea and Sub-Sahara West Africa: A validation of Freeth (1977) using focal mechanism solutions

Tectonic activity in Gulf of Guinea and Sub-Sahara West Africa: A validation of Freeth (1977) using focal mechanism solutions

Instrumentation of the Nigeria network of seismological stations

Tsunami Mitigation Strategy at Watu Ulo Beach Based on Numerical Modeling Using Delft3D-Flow

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