Role of Equatorial Anomaly in Earthquake time precursive features: A few strong events over West Pacific zone

Minakshi Devi, S. Patgiri, A. K. Barbara, Koh Ichiro Oyama, K. Ryu, V. Depuev, A. Depueva

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The earthquake (EQ) time coupling processes between equator-low-mid latitude ionosphere are complex due to inherent dynamical status of each latitudinal zone and qualified geomagnetic roles working in the system. In an attempt to identify such process, the paper presents temporal and latitudinal variations of ionization density (foF 2 ) covering 45°N to 35°S, during a number of earthquake events (M > 5.5). The approaches adopted for extraction of features by the earthquake induced preparatory processes are discussed in the paper through identification of parameters like the ‘EQ time modification in density gradient’ defined by δ = (foF 2 max − foF 2 min )∕τ mm , where τ mm – time span (in days) between EQ modified density maximum and minimum, and the Earthquake time Equatorial Anomaly, i.e. EEA, one of the most significant phenomenon which develops even during night time irrespective of epicenter position. Based on the observations, the paper presents the seismic time coupling dynamics through anomaly like manifestations between equator, low and mid latitude ionosphere bringing in the global Total Electron Content (TEC) features as supporting indices.

Original languageEnglish
Pages (from-to)1444-1455
Number of pages12
JournalAdvances in Space Research
Volume61
Issue number6
DOIs
Publication statusPublished - 2018 Mar 15

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

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