Document Type : Original Research Paper

Authors

• M Yari ¹
• R. Mohebian ²
• M. A. Riahi ³

¹ 1Ph.D. Student, Earth Physics Department, Institute of Geophysics, University of Tehran, Tehran, Iran

² Ph.D. Student, Earth Physics Department, Institute of Geophysics, University of Tehran, Tehran, Iran.

³ Associate Professor, Earth Physics Department, Institute of Geophysics, University of Tehran, Tehran, Iran.

Abstract

Instantaneous spectral attributes such as center frequency, root-mean-square frequency and bandwidth often are extracted from time-frequency spectrum to describe frequency- dependent rock properties in exploration seismic. These attributes are defined using probability theory. A time-frequency map (spectrogram) can be obtained from methods such as short-time Fourier transform (STFT), continuous-wavelet transform (CWT) and time-frequency continuous-wavelet transform (TFCWT) that methods CWT and TFCWT does not require preselecting a time window, which is essential in STFT and have better time-frequency resolution than STFT. In this paper is applied method using mathematical formulas which compute the instantaneous spectral attributes from the scalogram that these attributes are similar to attributes obtained from spectrogram TFCWT. Except that here not need to convert scalogram into spectrogram computing time will be longer.

Keywords

• Short-time Fourier transforms (STFT)
• Continuous Wavelet Transform (CWT)
• Time-Frequency Continuous Wavelet Transform (TFCWT)
• Center frequency
• Root-mean-square frequency
• Bandwidth

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