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Locating tremor using stacked products of correlations

Geophysical research letters, 2017-04, Vol.44 (7), p.3156-3164 [Peer Reviewed Journal]

2017. American Geophysical Union. All Rights Reserved. ;ISSN: 0094-8276 ;ISSN: 1944-8007 ;EISSN: 1944-8007 ;DOI: 10.1002/2016GL072272

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  • Title:
    Locating tremor using stacked products of correlations
  • Author: Li, Ka Lok ; Sadeghisorkhani, Hamzeh ; Sgattoni, Giulia ; Gudmundsson, Olafur ; Roberts, Roland
  • Subjects: Correlation ; Envelopes ; Estimates ; interferometry ; Noise ; Robustness ; source location ; Stations ; tremor location ; Tremors ; volcanic tremor ; Volcanoes
  • Is Part Of: Geophysical research letters, 2017-04, Vol.44 (7), p.3156-3164
  • Description: We introduce a back‐projection method to locate tremor sources using products of cross‐correlation envelopes of time series between seismic stations. For a given subset of n stations, we calculate the (n − 1)th‐order product of cross‐correlation envelopes and we stack the back‐projected products over combinations of station subsets. We show that compared to existing correlation methods and for realistic signal and noise characteristics, this way of combining information can significantly reduce the effects of correlated (spurious or irrelevant signals) and uncorrelated noise. Each back‐projected product constitutes an individual localized estimate of the source locations, as opposed to a hyperbola for the existing correlation techniques, assuming a uniform velocity in two dimensions. We demonstrate the method with synthetic examples and a real‐data example from tremor at Katla Volcano, Iceland, in July 2011. Despite very complex near‐surface structure, including strong topography and thick ice cover, the method appears to produce robust estimates of tremor location. Key Points A back‐projection method is introduced for locating tremor sources using the products of cross‐correlation envelopes The method better suppresses correlated and uncorrelated noise and gives a more robust estimate of locations than the common single‐correlation approach The method is demonstrated by synthetic examples and a real‐data example from tremor at Katla Volcano, Iceland, in 2011
  • Publisher: Washington: John Wiley & Sons, Inc
  • Language: English
  • Identifier: ISSN: 0094-8276
    ISSN: 1944-8007
    EISSN: 1944-8007
    DOI: 10.1002/2016GL072272
  • Source: Wiley Blackwell AGU Digital Library
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