Abstract

Long-term changes in thermal fields have been studied before and during strong earthquakes with magnitudes from 5.1 to 5.6 that occurred in the region of the Baikal rift zone in 2008–2022. Satellite data are used for these studies. For analysis we use the values of land surface temperature, temperature of the near-surface layer of the atmosphere, outgoing longwave radiation (OLR), and relative humidity (RH) recorded using the AIRS instrument mounted on the Aqua satellite. During the periods of preparation and occurrence of these seismic events, anomalous variations in the parameters of thermal fields registered with satellite are revealed. They exceed the average long-term values: for land surface temperature and temperature of the near-surface layer of the atmosphere by 5–10%, for OLR by 11–15%, and for RH by 6–10%. A strong negative correlation is found between changes in the temperature of the near-surface layer of the atmosphere and RH (correlation coefficient of –0.75), as well as antiphase oscillations between the values of the OLR and RH. The results can be used for studies of the precursor variability of thermal fields during monitoring of seismic hazard zones.

中文翻译：

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2008—2022年贝加尔裂谷带地区强地震孕育和发生期间卫星资料揭示的热场异常

摘要

研究了2008年至2022年贝加尔裂谷带地区发生的5.1至5.6级强震之前和期间热场的长期变化。这些研究使用卫星数据。为了进行分析，我们使用安装在 Aqua 卫星上的 AIRS 仪器记录的地表温度、大气近表层温度、出射长波辐射 (OLR) 和相对湿度 (RH) 值。在这些地震事件的准备和发生期间，卫星记录的热场参数的异常变化被揭示出来。它们超出了平均长期值：陆地表面温度和近地表层大气温度超出了 5-10%，OLR 超出了 11-15%，RH 超出了 6-10%。近地表层大气温度变化与 RH 之间存在很强的负相关性（相关系数为 –0.75），并且 OLR 和 RH 值之间存在反相振荡。研究结果可用于地震危险区监测过程中热场前兆变化的研究。