Waveform modeling and inversion of ambient noise cross-correlation functions in a coastal ocean environment

Xiaoqin Zang, Michael G Brown, Oleg A. Godin

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Theoretical studies have shown that cross-correlation functions (CFs) of time series of ambient noise measured at two locations yield approximations to the Green's functions (GFs) that describe propagation between those locations. Specifically, CFs are estimates of weighted GFs. In this paper, it is demonstrated that measured CFs in the 20-70 Hz band can be accurately modeled as weighted GFs using ambient noise data collected in the Florida Straits at ∼100 m depth with horizontal separations of 5 and 10 km. Two weighting functions are employed. These account for (1) the dipole radiation pattern produced by a near-surface source, and (2) coherence loss of surface-reflecting energy in time-averaged CFs resulting from tidal fluctuations. After describing the relationship between CFs and GFs, the inverse problem is considered and is shown to result in an environmental model for which agreement between computed and simulated CFs is good.

Original languageEnglish (US)
JournalJournal of the Acoustical Society of America
Volume138
Issue number3
DOIs
StatePublished - Jul 27 2015

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ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Arts and Humanities (miscellaneous)

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