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Wavelet Analysis of Far-Field Ground Motions from the Mw 7.6 2005 Kashmir Earthquake
The Kashmir region lies in the zone of the collision of the Indian and Eurasian tectonic plates. The interlocking between the two plates causes a release of accumulated strain at several faults in this collision zone and leads to frequent inter-plate earthquakes. The ground motions recorded in the earthquakes are time-domain signals, which do not convey information on the frequency content. Similarly, the amplitude-frequency representation obtained from Fourier transforms do not convey the time information. As ground motions are stochastic signals, both these representations convey incomplete information. Wavelet analysis provides information on both the time and frequency content of stochastic signals. In this paper, the continuous wavelet transforms (CWT) are utilized to understand the changing time–frequency characteristics of the far-field earthquake ground motions of 2005 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${M}_{w}$$\end{document} 7.6 Kashmir earthquake, which are available in the absence of near field ground motions. While some ground motions exhibit high amplitude waves at the same frequency content over a significant duration of time, other ground motions exhibit high amplitude waves in two to three frequency ranges. It is concluded that these observations correlate well with the observed non-uniform distribution of damage to reinforced concrete and unreinforced masonry structures in the region.
Wavelet Analysis of Far-Field Ground Motions from the Mw 7.6 2005 Kashmir Earthquake
The Kashmir region lies in the zone of the collision of the Indian and Eurasian tectonic plates. The interlocking between the two plates causes a release of accumulated strain at several faults in this collision zone and leads to frequent inter-plate earthquakes. The ground motions recorded in the earthquakes are time-domain signals, which do not convey information on the frequency content. Similarly, the amplitude-frequency representation obtained from Fourier transforms do not convey the time information. As ground motions are stochastic signals, both these representations convey incomplete information. Wavelet analysis provides information on both the time and frequency content of stochastic signals. In this paper, the continuous wavelet transforms (CWT) are utilized to understand the changing time–frequency characteristics of the far-field earthquake ground motions of 2005 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${M}_{w}$$\end{document} 7.6 Kashmir earthquake, which are available in the absence of near field ground motions. While some ground motions exhibit high amplitude waves at the same frequency content over a significant duration of time, other ground motions exhibit high amplitude waves in two to three frequency ranges. It is concluded that these observations correlate well with the observed non-uniform distribution of damage to reinforced concrete and unreinforced masonry structures in the region.
Wavelet Analysis of Far-Field Ground Motions from the Mw 7.6 2005 Kashmir Earthquake
Lecture Notes in Civil Engineering
Kolathayar, Sreevalsa (editor) / Chian, Siau Chen (editor) / Ifan, Mohammed Ayub (author) / Mathew, Shalin (author) / Vemuri, Jayaprakash (author)
2021-09-21
13 pages
Article/Chapter (Book)
Electronic Resource
English
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