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

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dc.contributor.authorOlugboji, T.en
dc.contributor.authorShirzaei, Manoochehren
dc.contributor.authorLu, Yingpingen
dc.contributor.authorAdepelumi, A. A.en
dc.contributor.authorKolawole, F.en
dc.coverage.countryNigeriaen
dc.date.accessioned2022-03-30T12:07:07Zen
dc.date.available2022-03-30T12:07:07Zen
dc.date.issued2021-09-20en
dc.description.abstractOn 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.</p>en
dc.description.notesThe authors acknowledge the use of the BlueHive Linux cluster at the University of Rochester's center for integrated research computing (CIRC). YL acknowledges a summer research grant from URSeismo and funding from the Georgen Institute of Data Science. The authors thank the Nigeria Geological Survey Agency (NGSA) for providing the aeromagnetic data used in this study. They acknowledge many helpful discussions with members of the URSeismo lab: Baowei Liu, Ziqi Zhang, Liam Moser, Trey Brink, and Faner Lin. The facilities of IRIS Data Services, and specifically the IRIS Data Management Center, were used for access to waveforms, related metadata, and/or derived products used in this study. IRIS Data Services are funded through the Seismological Facilities for the Advancement of Geoscience (SAGE) Award of the National Science Foundation under Cooperative Service Agreement EAR-1851048. The satellite (Figure 6) and aeromagnetic data (Figure 8) used for this research are published on a public repository at (Olugboji, 2020) and included as google KMZ files in the supplementary information files, Datasets S1 and S2. We thank the editor, PA, and two reviewers for their insightful comments which helped to increase the quality of the manuscript.en
dc.description.sponsorshipURSeismo; Georgen Institute of Data Science; Seismological Facilities for the Advancement of Geoscience (SAGE) Award of the National Science Foundation [EAR-1851048]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.3389/feart.2021.716630en
dc.identifier.eissn2296-6463en
dc.identifier.other716630en
dc.identifier.urihttp://hdl.handle.net/10919/109497en
dc.identifier.volume9en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectintraplate seismicityen
dc.subjecttremorsen
dc.subjectinterferometric synthetic aperture radaren
dc.subjectstructural inheritanceen
dc.subjectseismologyen
dc.subjectpolarizationen
dc.subjectWest Africaen
dc.titleOn the Origin of Orphan Tremors and Intraplate Seismicity in Western Africaen
dc.title.serialFrontiers in Earth Scienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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