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Publication Detail
Rock fracture compliance derived from time delays of elastic waves
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Mollhoff M, Bean CJ, Meredith PG
  • Publisher:
    WILEY-BLACKWELL PUBLISHING, INC
  • Publication date:
    11/2010
  • Pagination:
    1111, 1121
  • Journal:
    GEOPHYS PROSPECT
  • Volume:
    58
  • Issue:
    6
  • Print ISSN:
    0016-8025
  • Language:
    EN
  • Keywords:
    Compliance, Fracture, Time delay, Transmission coefficient, Ultrasonic
  • Addresses:
    Mollhoff, M
    Univ Coll Dublin
    UCD Sch Geol Sci
    Seismol & Computat Rock Phys Lab
    Dublin
    4
    Ireland

    Univ Coll Dublin
    CASL
    Dublin
    4
    Ireland
Abstract
The purpose of this study is to compare the reliability of various methods of estimating normal rock fracture compliance from elastic wave measurements. We compare ultrasonic through-transmission laboratory measurements for a smooth fracture in a Westerly granite specimen with numerical simulations and analytical solutions. The focus is on deriving compliance from time delays. The influence of specimen and source transducer width was constrained using numerical wave simulations. We find that measured ultrasonic phase delays are better suited to estimate the fracture compliance than group delays. Using the frequency domain instead of the time domain increases the accuracy of the fracture compliance estimates. We further show that for cases where precise phase delay measurements are unavailable, employing first break times in conjunction with numerical simulations can be considered as an alternative.
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