Earthquakes are among the major and destructive natural disasters on Earth. Thus, it is important to investigate whether the occurrence of earthquakes affects the behavior of atmospheric parameters. This study aims to examine the aerosol variations in the atmosphere from a multi-year perspective as the earthquake precursor for the eight Mw > 7.0 earthquakes over different locations on the world. In this study, we analyzed Moderate Resolution Imaging Spectroradiometer (MODIS) derived Aerosol Optical Depth (AOD) data as an earthquake precursor. In this context, 4-year (the earthquake year and the previous 3 years) epicentral AOD values were evaluated for each earthquake. As an anomaly indicator, ±2σ (95% confidence level) interval was utilized after applying 15-day moving average filter to the AOD time series. The results showed that any significant pre-seismic fluctuation or distinctive signal was not detected for any of the events, except for the 2017 Iraq Mw = 7.3 earthquake. However, identical anomalies are also observed 8–10 times in a year, which are not related to an earthquake. Thus, it can be assumed as a coincidence rather than a precursory signal. As a consequence, according to the scientific methodology (long-term AOD analysis) used in this study, sufficient precursory events could not be associated with the earthquakes to confirm the hypothesis that pre-seismic aerosol anomalies occur in the atmosphere.

地震是地球上主要的破坏性自然灾害之一。因此，重要的是研究地震的发生是否影响大气参数的行为。本研究旨在从多年的角度检查大气中的气溶胶变化，作为世界不同地点发生的 8 次 Mw > 7.0 地震的地震前兆。在这项研究中，我们将中分辨率成像光谱仪 (MODIS) 导出的气溶胶光学深度 (AOD) 数据作为地震前兆进行了分析。在这种情况下，对每次地震评估了 4 年（地震年和前 3 年）震中 AOD 值。作为异常指标，在对 AOD 时间序列应用 15 天移动平均滤波器后，使用 ±2σ（95% 置信水平）区间。结果表明，除 2017 年伊拉克 Mw = 7.3 地震外，任何事件均未检测到任何显着的震前波动或独特信号。然而，一年中也会观察到 8-10 次相同的异常现象，这与地震无关。因此，它可以被假定为巧合而不是前兆信号。因此，根据本研究中使用的科学方法（长期 AOD 分析），没有足够的前兆事件与地震相关联，以证实震前气溶胶异常发生在大气中的假设。与地震无关。因此，它可以被假定为巧合而不是前兆信号。因此，根据本研究中使用的科学方法（长期 AOD 分析），没有足够的前兆事件与地震相关联，以证实震前气溶胶异常发生在大气中的假设。与地震无关。因此，它可以被假定为巧合而不是前兆信号。因此，根据本研究中使用的科学方法（长期 AOD 分析），没有足够的前兆事件与地震相关联，以证实震前气溶胶异常发生在大气中的假设。