On the signifcance of requisite criteria in detecting pre earthquake ionospheric precursors: a case study of the Tohoku earthquake of March 11, 2011

Chukwuma, Victor U.; Adekoya, Bolarinwa J.; Thomas, Jewel E.; Emah, Joseph B.; Oloruntola, Racheal F.

doi:10.1007/s11600-021-00627-0

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Tytuł artykułu

On the signifcance of requisite criteria in detecting pre earthquake ionospheric precursors: a case study of the Tohoku earthquake of March 11, 2011

Autorzy

Chukwuma Victor U. , Adekoya Bolarinwa J. , Thomas Jewel E. , Emah Joseph B. , Oloruntola Racheal F.

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-021-00627-0

Warianty tytułu

Języki publikacji

Abstrakty

In the advent of the Tohoku earthquake (Mw 9.1 occurred at 14:46 LT on March 11, 2011), the Japan Meteorological Agency issued earthquake early warning announcements to the general public; however, there were problems with the precision of the early warning systems. This early warning systems issue, and the scale of consequential loss of human, material and technological resources of the Tohoku earthquake and those of about 57 earthquakes with magnitude M ≥ 7.5 from August 2008 to August 2018 around the world compel a need for investigation for detection of some signals before the earthquake that should be examined and interpreted as a precursor by examining the changes in the ionospheric phenomena. In this light, discrimination of pre-earthquake ionospheric anomalies of seismic origin from those of other drivers is essential for understanding, justifcation and physical interpretation of the earthquake precursors phenomena. Presently using a set of criteria that adequately diferentiates pre-earthquake anomaly of seismic origin from those of other sources, this study has shown concordant results with the existing studies namely that foF2 data obtained from 8 Chinese and Japanese stations revealed signifcant enhancements 2–6 days before the Tohoku earthquake and that the anomalies extended to 2774 km from the epicentre, thereby underscoring the necessity of requisite criteria in detecting pre-earthquake ionospheric precursors. Furthermore, the study suggests that the anomalous variations observed during periods of earthquake preparation are of seismo-magnetosphere origin.

Słowa kluczowe

foF2 earthquake seismo-ionospheric anomalies geomagnetic activity solar activity ionospheric precursor seismo-magnetosphere

foF2 trzęsienie ziemi anomalie sejsmojonosferyczne aktywność geomagnetyczna aktywność słoneczna prekursor jonosferyczny sejsmo-magnetosfera

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2021

Tom

Vol. 69, no. 4

Strony

1545--1566

Opis fizyczny

Bibliogr. 121 poz.

Twórcy

autor

Chukwuma Victor U.

uzodinmachukwuma@gmail.com

Department of Physics, Olabisi Onabanjo University, PMB 2002, Ago-Iwoye, Ogun State, Nigeria

https://orcid.org/0000-0001-7882-901X

autor

Adekoya Bolarinwa J.

adekoyabolarinwa@yahoo.com

Department of Physics, Olabisi Onabanjo University, PMB 2002, Ago-Iwoye, Ogun State, Nigeria

https://orcid.org/0000-0002-1443-5510

autor

Thomas Jewel E.

jewelemem@gmail.com

Department of Physics, Akwa Ibom State University, Ikot Akpaden, Mkpat Enin, Nigeria

autor

Emah Joseph B.

joemah73@gmail.com

Department of Physics, Akwa Ibom State University, Ikot Akpaden, Mkpat Enin, Nigeria

autor

Oloruntola Racheal F.

oloruntolafoluke16@gmail.com

Department of Physics, Olabisi Onabanjo University, PMB 2002, Ago-Iwoye, Ogun State, Nigeria

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