Abstract
Based on the method of polarity of signs of P-waves, the focal mechanisms of 1674 earthquakes with M ≥ 1.6, which occurred on the territory of the Bishkek geodynamic proving ground (BGPG) from 1994 to 2020, were determined. Some characteristics of the complete catalogue are presented. Quantitative distributions by the type of mechanisms and diagrams of azimuths of the main stress axes are constructed. A variety of focal mechanism of earthquake is observed, most of them are reverse fault, oblique reverse fault, and horizontal strike-slip fault. The compression axis for most of the events has a north-northwest direction and a sub-horizontal position. For 183, dynamic parameters (DP, source parameters) were obtained: spectral density Ω0, corner frequency f0, scalar seismic moment M0, source radius (Brune radius) r, and stress drop Δσ. The correlations between DP and energy characteristic (magnitude) and scalar seismic moment are investigated. The smallest correlation coefficient was obtained for stress drop.
Highlights
The Kyrgyz seismological network, installed in 1991 on the territory of the Northern Tien Shan, consists of 10 digital, broadband stations, each of which is equipped with an STS-2 sensor (Fig. 1)
The overwhelming amount of experimental information accumulated in modern seismology on the mechanisms of earthquake sources was obtained on the basis of data on the polarity of arrivals of seismic waves
For weak earthquakes that occurred on the territory bounded by the coordinates of the edge stations of the KNET network, the focal mechanisms of the sources were determined by the signs of the arrival of P-waves and a catalogue of focal mechanisms was formed, which includes 1674 earthquakes that occurred from 1994 to 2020 biennium
Summary
The Kyrgyz seismological network, installed in 1991 on the territory of the Northern Tien Shan, consists of 10 digital, broadband stations, each of which is equipped with an STS-2 sensor (Fig. 1). It was found that the stations of the KNET network are low-noise [1] and site under stations does not generate resonance effects [2]. The catalogue of earthquakes created on the basis of the KNET network database is representative [3], which makes it possible to carry out various seismological studies on its basis. The propagation of seismic waves in rocks is a complex process characterized by a number of parameters. It is conventionally accepted to divide the parameters into kinematic and dynamic. On the basis of seismic waves, various source parameters of earthquakes are calculated, which are usually divided into kinematic and dynamic ones. The focal mechanism is a geomechanical model of an earthquake source based on instrumental data from seismic records. The focal mechanism refers to the kinematic characteristic of the source
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