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

10 Citations (Scopus)

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

Fingerprint

cross correlation
oceans
waveforms
inversions
Green's functions
weighting functions
straits
Coast
Inversion
Ocean
Modeling
dipoles
propagation
radiation
estimates
approximation
energy

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Arts and Humanities (miscellaneous)

Cite this

Waveform modeling and inversion of ambient noise cross-correlation functions in a coastal ocean environment. / Zang, Xiaoqin; Brown, Michael G; Godin, Oleg A.

In: Journal of the Acoustical Society of America, Vol. 138, No. 3, 27.07.2015.

Research output: Contribution to journalArticle

@article{de8888c1b4fb4956bd3bb733737c9d40,
title = "Waveform modeling and inversion of ambient noise cross-correlation functions in a coastal ocean environment",
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.",
author = "Xiaoqin Zang and Brown, {Michael G} and Godin, {Oleg A.}",
year = "2015",
month = "7",
day = "27",
doi = "10.1121/1.4928303",
language = "English (US)",
volume = "138",
journal = "Journal of the Acoustical Society of America",
issn = "0001-4966",
publisher = "Acoustical Society of America",
number = "3",

}

TY - JOUR

T1 - Waveform modeling and inversion of ambient noise cross-correlation functions in a coastal ocean environment

AU - Zang, Xiaoqin

AU - Brown, Michael G

AU - Godin, Oleg A.

PY - 2015/7/27

Y1 - 2015/7/27

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84941047807&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84941047807&partnerID=8YFLogxK

U2 - 10.1121/1.4928303

DO - 10.1121/1.4928303

M3 - Article

AN - SCOPUS:84941047807

VL - 138

JO - Journal of the Acoustical Society of America

JF - Journal of the Acoustical Society of America

SN - 0001-4966

IS - 3

ER -