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A platform for research: civil engineering, architecture and urbanism
Automatic extraction of retrograde and Prograde Rayleigh waves from three-component earthquake signals in different depths of earth
https://orcid.org/0000-0002-6373-5253
Abstract Extraction of Rayleigh waves from earthquake signals has become an important topic in civil engineering and seismology. In this study, we propose an automatic filtering procedure to extract retrograde and prograde Rayleigh waves and their propagation azimuths from the earthquake signals, separately. In this method, the users do not need to specify an initial filtering limits. The proposed procedure has been first verified with synthetic signals. We show that the points where new retrograde and prograde elliptical motions appear in the signals can be easily distinguished by using the proposed method. Since the Rayleigh waves contents in real signals may change in different earthquakes, this method in comparison with previous methods will be more realistic in extracting Rayleigh from real signals. The proposed method is used to extract the retrograde and prograde Rayleigh waves from recorded earthquakes in Garner Valley Downhole Array. Recorded signals in 6 levels of earth depth have been studied in this work, at 0 m, 6 m, 15 m, 22 m, 50 m and 150 m. We find that the share of prograde Rayleigh waves become more than the share of retrograde waves in deeper levels.
Highlights An automatic method is proposed to extract retrograde and prograde Rayleigh waves.
Automatic extraction of retrograde and Prograde Rayleigh waves from three-component earthquake signals in different depths of earth
https://orcid.org/0000-0002-6373-5253
Abstract Extraction of Rayleigh waves from earthquake signals has become an important topic in civil engineering and seismology. In this study, we propose an automatic filtering procedure to extract retrograde and prograde Rayleigh waves and their propagation azimuths from the earthquake signals, separately. In this method, the users do not need to specify an initial filtering limits. The proposed procedure has been first verified with synthetic signals. We show that the points where new retrograde and prograde elliptical motions appear in the signals can be easily distinguished by using the proposed method. Since the Rayleigh waves contents in real signals may change in different earthquakes, this method in comparison with previous methods will be more realistic in extracting Rayleigh from real signals. The proposed method is used to extract the retrograde and prograde Rayleigh waves from recorded earthquakes in Garner Valley Downhole Array. Recorded signals in 6 levels of earth depth have been studied in this work, at 0 m, 6 m, 15 m, 22 m, 50 m and 150 m. We find that the share of prograde Rayleigh waves become more than the share of retrograde waves in deeper levels.
Highlights An automatic method is proposed to extract retrograde and prograde Rayleigh waves.
Automatic extraction of retrograde and Prograde Rayleigh waves from three-component earthquake signals in different depths of earth
https://orcid.org/0000-0002-6373-5253
Abstract Extraction of Rayleigh waves from earthquake signals has become an important topic in civil engineering and seismology. In this study, we propose an automatic filtering procedure to extract retrograde and prograde Rayleigh waves and their propagation azimuths from the earthquake signals, separately. In this method, the users do not need to specify an initial filtering limits. The proposed procedure has been first verified with synthetic signals. We show that the points where new retrograde and prograde elliptical motions appear in the signals can be easily distinguished by using the proposed method. Since the Rayleigh waves contents in real signals may change in different earthquakes, this method in comparison with previous methods will be more realistic in extracting Rayleigh from real signals. The proposed method is used to extract the retrograde and prograde Rayleigh waves from recorded earthquakes in Garner Valley Downhole Array. Recorded signals in 6 levels of earth depth have been studied in this work, at 0 m, 6 m, 15 m, 22 m, 50 m and 150 m. We find that the share of prograde Rayleigh waves become more than the share of retrograde waves in deeper levels.
Highlights An automatic method is proposed to extract retrograde and prograde Rayleigh waves.
Automatic extraction of retrograde and Prograde Rayleigh waves from three-component earthquake signals in different depths of earth
Naghshin, Pouya (author) / Bahadori, Hadi (author)
2021-04-29
Article (Journal)
Electronic Resource
English
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