ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2022, Vol. 19, No. 2, pp. 81-90

Atmospheric effects of the largest earthquakes in the Alpine-Himalayan seismic belt

L.G. Sverdlik 1, 2 
1 Research Station RAS in Bishkek City, Bishkek, Kyrgyzstan
2 Kyrgyz–Russian Slavic University, Bishkek, Kyrgyzstan
Accepted: 28.04.2022
DOI: 10.21046/2070-7401-2022-19-2-81-90
The upper troposphere and lower stratosphere (UTLS) is a dynamic region exposed to impacts of various perturbations which can be traced by temperature changes. Within this study the task was to identify anomalous temperature changes which can be associated with large seismic events. Satellite measurements (MERRA-2) within periods of preparation of four destructive earthquakes of M > 7.5 occurred in the Alpine-Himalayan seismic belt: in China (2008), Iran, Pakistan (2013) and Nepal (2015). To identify pre-seismic perturbations a new approach to the analysis of spatial-temporal temperature changes in UTLS based on a modified STA/LTA criterion, statistic and spectral analysis has been suggested. The developed algorithm is based on sequential calculation of inter-day temperature variability ΔT of the moving dispersions ratio (VARSTA / VARLTA) and integral parameters of anomalous variations δTC (δT). The range and nature of changes of the parameters were determined by the intensity of short-period temperature perturbations. Application of the developed algorithm revealed that the anomalies of seismogenic origin were characterized by high values of parameter δTC (≥2.0) and manifested as explicit mesoscale (300–800 km), relatively long-lived (from 18 to 36 hours) disturbed areas. Temperature anomalies were observed 1–5 days before strong earthquakes within several hundred kilometers from their epicenters. Due to the fact that all events under examination occurred against the background of calm geomagnetic conditions, the spatial-temporal distribution of atmospheric temperature anomalies suggest probable association with the earthquake preparation processes.
Keywords: satellite measurements, temperature, earthquake, upper troposphere, lower stratosphere, STA/LTA criterion, integral parameter, anomaly, geomagnetic activity, Dst-index
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