Monitoring of deformation processes on the Almaty prognostic test ground by tiltmeters and extensometers
A. V. Tikhomirov, A. L. Smirnov, I. D. Pil'guk, and M. P. Bakulina
Keywords: Deformation, Earth's crust, disturbances, anomaly, earthquake, stress
Pages: 1659-1666
Abstract
This paper deals with deformation processes in the Earth's crust recorded by tiltmeters and extensometers in the Northern Tien Shan. The characteristics of instrumentation are reported. The deformation stations located in different geological conditions are described, and the accuracy of measurements of deformations is estimated. Examples of deformation disturbances preceding an earthquake are given. The deformations are of seasonal character. Thus, expansion deformations are recorded in vernal periods, and compressional ones, in the fall. Zones of development of abnormal deformations during preparation of a seismic event are characterized. Abnormal deformations irrelevant to earthquakes are recognized, which are usually due to changes of the groundwater regime.
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