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Your search keyword '"blow-like signals"' showing total 3 results
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3 results on '"blow-like signals"'

1. Analytical description of the seismic signals based on the nonorthogonal amplitude-frequency analysis of the smoothed signals

Author

Rybin, A.K., Nigmatullin, R.R., Nepeina, K.S., Kaznacheev, P.A, and Alexandrov, P.N.

Subjects
blow-like signals, NAFASS method, earthquake, Tien Shan, Geology, QE1-996.5
Abstract

The paper presents a new approach to the description of earthquake seismic signals based on the nonorthogonal amplitude-frequency analysis of the smoothed signals (NAFASS) method. The authors consider an example of the processing of one of earthquake’s records that occurred in the Tien Shan territory. The earthquake signals were recorded at the Karagai-Bulak seismic station, which is a part of the digital telemetry network KNET, located in the Northern Tien Shan area. The paper presents the results from the first stage of creation of a collection of blow-like signals with beatings (such as earthquakes) «fingerprints», which will provide additional information characterizing the modern geodynamic processes of the Tien Shan. Such analysis of seismic signals for the Tien Shan earthquakes has not been carried out yet. The authors hope that using the reduced fractal model on the base of NAFASS method will help avoid extensive calculations of standard methods and directly construct a quantitative description of earthquakes in the terms of a common set of fitting parameters by creating a «waveform portrait» of a seismic event.

Published
2019
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2. Fractal description of the complex beatings: How to describe quantitatively seismic waves?

Author

Nigmatullin, Raoul R., Vorobev, Artem S., Nepeina, Kseniia S., and Alexandrov, Pavel N.

Subjects
*FRACTALS, *FREQUENCY response, *WAVE analysis, *CATHODE ray oscillographs, *AMPLITUDE modulation
Abstract

Highlights • Complex beatings. • Fractal structure of the EQ-wave forms. • The NAFASS approach. • The AFR of the EQs wave forms. Abstract In this paper, we suggest a new algorithm for description of complex beatings. Under the complex beating we understand a signal, which contains the high-frequency (HF) component that is located between two low-frequency (LF) envelopes having random origin. These beatings are associated with the so-called blow-like signals (BLS) and a typical example of the BLS can be associated with the registered earthquakes signals. For description of these signals, it becomes possible to separate two envelopes from the HF-component located between them and find their amplitude-frequency response (AFR) based on the non-orthogonal amplitude-frequency analysis of the smoothed signals (NAFASS) approach that was suggested earlier by one of the authors (RRN) in paper [1]. It was successfully applied for description of economic data having also multi-frequency structure. In order to separate these envelopes from the HF component one can notice that the most signals of such kind have a fractal (self-similar) structure. It means that under reasonable compression/scaling of these signals they keep approximately their initial structure. This scaling property can be tested on many types of the different signals. In the results of application of the NAFASS approach one can describe quantitatively the desired envelopes and obtain their AFRs. As an example, we considered the randomly taken data that were recorded from EQs station located in Kyrgyzstan. We deliberately chose the different types of the EQs signals in order to demonstrate the flexibility and wide applicability of the proposed algorithm. We expect that this algorithm can find a wide application for description of many BLS that are met frequently in many natural phenomena and engineering applications. [ABSTRACT FROM AUTHOR]

Published
2019
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3. ANALYTICAL DESCRIPTION OF THE SEISMIC SIGNALS BASED ON THE NONORTHOGONAL AMPLITUDE-FREQUENCY ANALYSIS OF THE SMOOTHED SIGNALS

Author

Raoul R. Nigmatullin, A. K. Rybin, P. A. Kaznacheev, K. S. Nepeina, and P.N. Alexandrov

Subjects
Physics, Frequency analysis, Acoustics, lcsh:QE1-996.5, blow-like signals, Tien Shan, law.invention, lcsh:Geology, Amplitude, law, earthquake, NAFASS method, General Earth and Planetary Sciences, General Environmental Science
Abstract

The paper presents a new approach to the description of earthquake seismic signals based on the nonorthogonal amplitude-frequency analysis of the smoothed signals (NAFASS) method. The authors consider an example of the processing of one of earthquake’s records that occurred in the Tien Shan territory. The earthquake signals were recorded at the Karagai-Bulak seismic station, which is a part of the digital telemetry network KNET, located in the Northern Tien Shan area. The paper presents the results from the first stage of creation of a collection of blow-like signals with beatings (such as earthquakes) «fingerprints», which will provide additional information characterizing the modern geodynamic processes of the Tien Shan. Such analysis of seismic signals for the Tien Shan earthquakes has not been carried out yet. The authors hope that using the reduced fractal model on the base of NAFASS method will help avoid extensive calculations of standard methods and directly construct a quantitative description of earthquakes in the terms of a common set of fitting parameters by creating a «waveform portrait» of a seismic event.

Published
2019

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