Preliminary detection of seismic signal arrival by polarization feature

Research is aimed at developing methodological principles for preliminary detection of the seismic signal arrival registered by a three-component seismic station (TCSS), taking into account polarization properties of background and signal components. Methods. Seismic signals were recorded using the GURALP CMG seismic observation network of the Main Special Control Center (MSCC) of the State Space Agency (SSA) of Ukraine. Result. The main difference between a signal component of a three-component seismic record and a background is polarization properties. Considering these characteristics makes it possible to detect seismic signals and determine their components. Traditional methods for analyzing polarization in a three-component seismic record often involve significant computational effort and are typically employed for processing and analyzing seismic data in real time. In this study, we propose a new approach that evaluates the linearity of the implemented methods and determines the angles of seismic wave arrivals. This is particularly crucial for monitoring potential emergency sources, such as hazardous objects and seismically active areas. Our method can also be applied in real-time scenarios. Scientific novelty. Considering the properties of polarization, as opposed to relying solely on amplitude detection criteria, enables the detection of signals with a lower signal-to-noise ratio. This increases the sensitivity of the Transient Coherent Seismic Source (TCSS) to magnitudes. By utilizing polarization analysis in seismic signal detection, we not only enhance detection capabilities but also gain additional information about the parameters of seismic signal components, such as their azimuth and angle of arrival at the surface. This information can be instrumental in identifying the seismic signal components and determining the location of the seismic event source in relation to the observation point (OP). Significance of research. This approach makes it possible to increase the magnitude sensitivity of OP and the observation system as a whole. The relative simplicity of implementation makes it possible to apply it in real time. Determining angular characteristics of seismic wave arrival allows applying the proposed approach in a continuous monitoring loop for potential emergency sources.