Anomalies of Thermal Fields Revealed by Satellite Data during the Preparation and Occurrence of Strong Earthquakes in the Region of the Baikal Rift Zone in 2008–2022

Pub Date : 2024-02-20 DOI:10.1134/s0001433823120046

V. G. Bondur, O. S. Voronova

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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.

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卫星数据揭示的 2008-2022 年贝加尔裂谷区准备和发生强震期间的热场异常现象

摘要对贝加尔裂谷区 2008-2022 年发生 5.1 至 5.6 级强震之前和期间热场的长期变化进行了研究。这些研究使用了卫星数据。我们使用安装在 Aqua 卫星上的 AIRS 仪器记录的陆地表面温度、大气近表层温度、外向长波辐射（OLR）和相对湿度（RH）值进行分析。在这些地震事件的准备和发生期间，卫星记录的热场参数出现了异常变化。它们超出了长期平均值：陆地表面温度和大气近表层温度超出 5-10%，OLR 超出 11-15%，相对湿度超出 6-10%。大气近表层温度的变化与相对湿度之间存在很强的负相关（相关系数为-0.75），OLR 值与相对湿度值之间也存在反相振荡。研究结果可用于地震危险区监测期间热场前兆变化的研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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