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


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 5, pp. 114-122

Spatial-temporal distribution of atmospheric perturbations before strong earthquakes in Tien-Shan

L.G. Sverdlik 1 , S.A. Imashev 1 
1 Research Station RAS in Bishkek City, Bishkek, Kyrgyzstan
Accepted: 13.08.2020
DOI: 10.21046/2070-7401-2020-17-5-114-122
In this paper, we analyzed spatial-temporal temperature changes in the upper troposphere/lower stratosphere (UTLS) above the territory of Kyrgyzstan detected by spaceborne remote sensing data which were compared against seismic activities in Tien-Shan. To examine temperature variability in pre-seismic periods, 16 earthquakes of magnitude 5.0 to 7.4 were selected that occurred in the territory or in the vicinity of Kyrgyzstan borders during the 1992–2015 period. The anomalous changes highlighted in temperature time series, that were used as pre-seismic attributes, were determined using a special algorithm, which allows to visualize perturbations in the tropopause in one- and bi-dimensional representation. Anomalous variations of integrated parameters were calculated with account for specifics of amplitude variations and the phase of short-term temperature variations at UTLS isobaric levels divided by the tropopause. The results obtained show that the spatial structure and temperature anomalies dynamics in the sphere of the tropopause have a sufficient stable relation to seismic activity. The assessment of the spatial scale and time of anomalous temperature perturbations manifestations demonstrated that the temperature anomalies, the horizontal dimension of which was about 200–500 km, were observed in all the reviewed cases for a period from ~3 to 72 hours before the main seismic event.
Keywords: earthquake, satellite data, upper troposphere, lower stratosphere, temperature, anomalies, tropopause, integral parameter
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