“…Researchers have employed non-seismic indicators in ANN and have discovered some supportive evidence for the efficacy of their models in predicting earthquakes. These non-seismic signals include Seismic Electric Signals (Astuti et al, 2014;Konstantaras et al, 2007;Mejia et al, 2015;Moustra et al, 2011;Xue et al, 2022Xue et al, , 2023, water level (Jiang et al, 2009;Shao et al, 2012), rainfall rate (Hajikhodaverdikhan et al, 2018;Suratgar et al, 2008), pressure (Külahcı et al, 2009), radon concentration (Külahcı et al, 2009;Mir et al, 2022), geo-magnetic and solar indices (Akhoondzadeh, 2013), oxygen ion density (Ma et al, 2010;Xu et al, 2010), helium ion density (Ma et al, 2010;Xu et al, 2010), ion temperature (Hafeez et al, 2021;Ma et al, 2010;Xiong et al, 2022;Xu et al, 2010), electron density (Hafeez et al, 2021;Ma et al, 2010;Xu et al, 2010), ground temperature (Suratgar et al, 2008), hydrochemistry (Jiang et al, 2009), methane concentration obtained by satellite data (Xiong et al, 2021) and so on. See also Mearns and Sornette (2021) and Sornette et al (2021) for a review of the use of an ensemble of non-seismic precursors in the prediction of the historical Haicheng and Tangshan earthquakes in China.…”