Finite-Frequency Inversion of Cross-Correlation Amplitudes for Ambient Noise Source Directivity Estimation

Arjun Datta, Shravan Hanasoge, Jeroen Goudswaard

    Research output: Contribution to journalArticle

    Abstract

    We present a new method for determining the azimuthal variation of ambient noise sources, which combines the computational speed and simplicity of traditional approaches with the rigor of waveform-inversion-based approaches to noise source estimation. This method is based on a previously developed theoretical framework of sensitivity kernels for cross-correlation amplitudes. It performs a tomographic inversion for ambient noise sources on the Earth's surface and is suitable for small- (local-) scale studies. We apply the method to passive seismic data acquired in an exploration context and account for azimuth-dependent uncertainties in observed cross-correlation amplitudes. Our inversion results correlate well with the azimuthal distribution of noise sources suggested by signal-to-noise ratio analysis of noise cross-correlation functions.

    Original languageEnglish (US)
    JournalJournal of Geophysical Research: Solid Earth
    DOIs
    StatePublished - Jan 1 2019

    Fingerprint

    ambient noise
    directivity
    cross correlation
    Signal to noise ratio
    Earth (planet)
    inversions
    signal-to-noise ratio
    azimuth
    seismic data
    Earth surface
    waveforms
    signal to noise ratios
    inversion
    method
    Uncertainty
    sensitivity

    Keywords

    • ambient seismic noise
    • cross-correlation amplitude
    • finite-frequency kernels
    • noise directivity
    • waveform inversion

    ASJC Scopus subject areas

    • Geophysics
    • Geochemistry and Petrology
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science

    Cite this

    Finite-Frequency Inversion of Cross-Correlation Amplitudes for Ambient Noise Source Directivity Estimation. / Datta, Arjun; Hanasoge, Shravan; Goudswaard, Jeroen.

    In: Journal of Geophysical Research: Solid Earth, 01.01.2019.

    Research output: Contribution to journalArticle

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