Fracture and damage localization in volcanic edifice rocks from El Hierro, Stromboli and Tenerife

Claire E. Harnett, Philip M. Benson, Pete Rowley, Marco Fazio

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Abstract

We present elastic wave velocity and strength data from a suite of three volcanic rocks taken from the volcanic edifices of El Hierro and Tenerife (Canary Islands, Spain), and Stromboli (Aeolian Islands, Italy). These rocks span a range of porosity and are taken from volcanoes that suffer from edifice instability. We measure elastic wave velocities at known incident angles to the generated through-going fault as a function of imposed strain, and examine the effect of the damage zone on P-wave velocity. Such data are important as field measurements of elastic wave tomography are key tools for understanding volcanic regions, yet hidden fractures are likely to have a significant effect on elastic wave velocity. We then use elastic wave velocity evolution to calculate concomitant crack density evolution which ranges from 0 to 0.17: highest values were correlated to the damage zone in rocks with the highest initial porosity.
Original languageEnglish
Article number1942
JournalScientific Reports
Volume8
Early online date31 Jan 2018
DOIs
Publication statusPublished - 31 Jan 2018

Keywords

  • RCUK
  • NERC
  • NE/L002574/1

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