Seismicity and seismic hazard assessment in West Africa

Kadiri, A.U.; Kijko, Andrzej

doi:10.1016/j.jafrearsci.2021.104305

Cited by 9 publications

(3 citation statements)

References 47 publications

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“…In this study, we explore the passive margin of western Central Africa, an area which shows significant intraplate seismicity in both its offshore domains and within the continent (Figures 2a and 2b). This region has been the subject of much research for almost a century (Ambraseys & Adams, 1986; Amponsah et al., 2012; Delvaux & Barth, 2010; Heidbach et al., 2018; Junner & Bates, 1941; Kadiri & Kijko, 2021; Krenkel, 1923; Musson, 1992; Nwankwoala & Orji, 2018; Oladejo et al., 2020). Although most of the studies focused on the use of remote sensing to provide a seismotectonic model for the region (Adepelumi et al., 2008; Awoyemi & Onyedim, 2004; Awoyemi et al., 2017; Bouka Biona & Sounga, 2001; Oladejo et al., 2020), the characterization of the structures is sparse, and there remains a limited understanding of the detailed structure and current stress state of the potentially seismogenic preexisting faults.…”

Section: Introductionmentioning

confidence: 99%

Seismogenic Fault Reactivation in Western Central Africa: Insights From Regional Stress Analysis

Nkodia

Miyouna

Kolawole

et al. 2022

Geochem Geophys Geosyst

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Earthquakes remain one of the most catastrophic natural hazards in human history. Beyond the associated fatalities, earthquakes also leave behind lasting environmental and economic crises in the affected communities. Although, the largest magnitude earthquakes have been recorded along plate boundaries in association with plate subduction, collision, and continental rifting (McCaffrey, 2008), several large magnitude (Mw > 6) events have also been recorded in intraplate regions (e.g., Talwani, 2014;Tuttle et al., 2002), and more intriguingly, along passive continental rift margins where the sources and occurrence of earthquakes remain less understood. Among the large magnitude and devastating earthquakes recorded in continental intraplate regions previously thought to be relatively stable include the Mw 6.2 Latur Earthquake of

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Section: Introductionmentioning

confidence: 99%

Seismogenic Fault Reactivation in Western Central Africa: Insights From Regional Stress Analysis

Nkodia

Miyouna

Kolawole

et al. 2022

Geochem Geophys Geosyst

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“…A comprehensive search of the global earthquake catalog in the decade leading up to September 2018 does not turn up any events located within Nigeria, although we point out that in the Western African region, these catalogs are incomplete below moment magnitude 4 (Kadiri and Kijko, 2021). In the region, most of the events are clustered around oceanic transform faults, with only a few inland earthquakes.…”

Section: Introductionmentioning

confidence: 75%

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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“…However, the Emergency Event Database (EM-DAT) records provide enough information to specify the likelihood of a particular hazard occurring at a specific time and in a specific space. Most researchers assess threats from natural hazards by identifying the frequency and likelihood of their occurrence (see for example, Ahulu et al [33]; Kadiri and Kijko [34]). Some also focus on an entity's exposure and the severity of impacts, expressed in terms of the losses and damages generated (see for example, Agada and Nirupama [35]; Zhang and Zhang [36]; Prabnakorn et al [37]).…”

Section: Literature Reviewmentioning

confidence: 99%

Climate and Food Insecurity Risks: Identifying Exposure and Vulnerabilities in the Post-Food Production System of Northern Ghana

Osman

2023

Land

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Evidence shows how food system activities, from production to consumption, underpin food security. However, studies exploring climate impacts on food security in northern Ghana have overly focused on production systems, neglecting post-production activities that loom large in food security. This paper addresses the research need to comprehensively analyze how climate change and weather variabilities affect post-production activities and exacerbate food insecurity risks in northern Ghana. It analyzes data on climate hazards, impacts, and food system vulnerabilities using questionnaires and participatory engagement with farming households in northern Ghana. Results show that climate-induced food insecurity risks in northern Ghana are not just products of persistent exposure to climate hazards and their impacts on food production in the region. Instead, risks are inextricably connected to the vulnerability contexts within which food is harvested, processed, stored, and marketed. Specifically, the results reveal that climate hazard events such as floods, extreme temperatures, and droughts damage stored grain, disrupt food supply to the market, and cause seasonal volatilities in food prices. However, these impacts are not solely externally generated circumstances. The food system is highly vulnerable; most households lack access to threshing and grinding machines, warehouse storage, post-harvest management information, and transportation services. These underlying characteristics of the post-food production system of northern Ghana, which is ultimately quite remote from climate change and weather variabilities, exacerbate household-level food insecurity risks.

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Seismicity and seismic hazard assessment in West Africa

Cited by 9 publications

References 47 publications

Seismogenic Fault Reactivation in Western Central Africa: Insights From Regional Stress Analysis

Seismogenic Fault Reactivation in Western Central Africa: Insights From Regional Stress Analysis

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

Climate and Food Insecurity Risks: Identifying Exposure and Vulnerabilities in the Post-Food Production System of Northern Ghana

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