quake prediction studies are conducted, but in order to carry out these prediction studies, it is essential to understand the characteristics of earthquakes and analyse them accurately. This study examines the characteristics of earthquakes in the light of chaos theory. Two consecutive major earthquakes that occurred in Turkey in 1999 and the regions where they occurred were considered for this purpose. Earthquake catalogue data recorded in the last 30 years prior to the major earthquakes in these regions were used. The chaotic characteristics, such as the time between the two earthquakes, the magnitude of earthquakes, the depth of earthquakes, and the distance of each earthquake from the location where the major earthquake occurred, was analysed through frequency analysis, phase portraits, and the Lyapunov exponent method. The results indicate that all four characteristics are chaotic, with positive Lyapunov values for both regions.