A statistical analysis of seismo-ionospheric TEC anomalies before 63 M(w)5.0 earthquakes in Turkey during 2003-2016


Şentürk E. , Çepni M. S.

ACTA GEOPHYSICA, vol.66, pp.1495-1507, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 66
  • Publication Date: 2018
  • Doi Number: 10.1007/s11600-018-0214-2
  • Title of Journal : ACTA GEOPHYSICA
  • Page Numbers: pp.1495-1507
  • Keywords: Total electron content, Earthquake precursor, Statistical analysis, CODE-GIM, GPS, GNSS, ION DENSITY VARIATIONS, OBSERVATION EVIDENCES, ELECTRIC-FIELD, GRAVITY-WAVES, PRECURSORS, DEMETER, GNSS

Abstract

In this study, pre-seismic and post-seismic total electron content (TEC) anomalies of 63 M(w)5.0 earthquakes in Turkey (36 degrees-42 degrees N, 26 degrees-45 degrees E) were statistically investigated. The largest earthquake that occurred in Turkey during 2003-2016 is the M-w 7.1 Van earthquake on October 23, 2011. The TEC data of epicenters is obtained from CODE-GIM using a simple 4-point bivariate interpolation. The anomalies of TEC variations were determined by using a quartile-based running median process. In order to validate GIM results, we used the GPS-TEC data of available four IGS stations within the size of the Van earthquake preparation area. The anomalies that are detected by GIM and GPS-TEC show a similar pattern. Accordingly, the results obtained with CODE-GIM are reliable. The statistical results show that there are not prominent earthquake precursors for M(w)6.0 earthquakes in Turkey.