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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/nhess-2020-128
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-128
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 25 May 2020

Submitted as: research article | 25 May 2020

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This preprint is currently under review for the journal NHESS.

Evaluation of global seismicity along Northern and Southern hemispheres

Olaide Sakiru Hammed1, Theophilus Aanuoluwa Adagunodo2, Musa Oluwafemi Awoyemi3, Joel Olayide Amosun4, Tokunbo Sanmi Fagbemigun4, and Tobi Ebenezer Komolafe1 Olaide Sakiru Hammed et al.
  • 1Department of Physics, Federal University, Oye-Ekiti, Nigeria
  • 2Department of Physics, Covenant University, Ota, Nigeria
  • 3Department of Physics, Obafemi Awolowo University, Ile-Ife, Nigeria
  • 4Department of Geophysics, Federal University, Oye-Ekiti, Nigeria

Abstract. An earthquake has been identified as one of the major natural disasters that cause loss of lives and property. To mitigate this disaster, knowledge of global seismicity is essential. This research is aimed at evaluating the Gutenberg Richter b-value parameter and focal depth distribution of earthquake parameters to identify the prominent earthquake-prone zones in the Northern and Southern hemispheres. The study area covers 20° to the Northern and Southern hemispheres, with the equator in the middle. The data were obtained from the earthquake catalogue of the Advanced National Seismic System (ANSS) hosted by the Northern California Earthquake Data Centre USA from 1963–2018. Fifty-four-year earthquake data of M ≥ 6.0 were processed and analyzed using Gutenberg-Richter (GR). The b-value parameters obtained from the GR model were plotted against the hemispheres using bar chart graphs to determine the tectonic stress level of the study region. The earthquake energy released was evaluated along the Northern and Southern hemispheres for a proper understanding of seismic events in the study region. It was observed that the rate of earthquake occurrence at the Southern hemisphere is higher than the Northern hemisphere. The b-values obtained in all the zones vary from 0.82–1.16. At the same time, the maximum earthquake energy of 4.6 × 1025 J was estimated. Low b-values indicate high tectonic stress within the plates. The large tectonic stress accumulation around the equator suggests that unstable lithospheres characterize this zone.

Olaide Sakiru Hammed et al.

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Olaide Sakiru Hammed et al.

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