HYDROGEOSEISMOLOGICAL PRECURSORS SUSAMYR EARTHQUAKE 1992

• Main Authors: Abdullaev, A.U (Author), Rasulov, A.V (Author), Shin, L.Yu (Author), Yessenzhigitova, Y.Zh (Author), Yusupov, Sh.S (Author)
• Format: Article
• Language: English
• Published: National Academy of Sciences of the Republic of Kazakhstan 2022
• Subjects: Anomaly; Background value; Gas concentration; Hydrogeoseismology; Isotopic composition; Magnitude; Precursor; Seismogenic zones; Tectonic conditions; Variation
• Online Access: View Fulltext in Publisher

 On August 19, 1992, in the central spurs of the Northern Tien- Shan in the Susamyr ridge, one of the strongest earthquakes in Central Asia in the last century occurred, which value M=7.5 in magnitude. The Susamyr earthquake, named after the place of origin, was preceded by anomalies in the seismic regime, geophysical, hydrogeological and geochemical fields, were noted in the Tashkent, Fergana, Bishkek, Almaty, Issyk-Kul, Dzhungar and Urumchi seismic prognostic fields.As a result of synchronization of the anomaly occurrence time for this event for all polygons, it was possible to note that the earliest anomalies in the hydrogeodynamic, hydrogeochemical and gas composition of groundwater were recorded  2-2.5  months  before. The greatest interest is caused by the development of the anomaly in the far zones in the Tashkent geodynamic test site. This paper presents the results of routine observations of the seismohydrogeological parameters of groundwater in seismically active zones of Uzbekistan. The research  period  covers  the time of preparation and implementation of the strongest earthquake over the last century. Hydrogeochemical, hydrogeodynamic, geophysical conditions of manifestation and seismotectonic conditions of localization of the source and location of observation water points relative to the epicenter of this earthquake on the territory of the Republic of Uzbekistan are considered. A complete review of all materials shows that anomalies of destructive earthquakes arise mainly as a result of renewal of large, global faults that limit multidirectional tectonic structures, which affected the spread of anomalous precursor phenomena over a vast territory. © National Academy of Sciences of the Republic of Kazakhstan, 2022.