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pure and applied geophysics

, Volume 124, Issue 4–5, pp 759–772 | Cite as

Radiated seismic energy and strain energy release in laboratory dynamic tensile fracture

  • Frances M. Boler
  • Hartmut Spetzler
Article

Abstract

Tensile dynamic fractures were propagated under two experimental congifurations for the purpose of assessing the relative amount of strain energy release that is consumed as fracture energy and radiated as seismic waves. The configurations used were (1) application of localized thermal stresses to 2.29 mm-thick plates of soda-lime glass and (2) double cantilever beam (DCB) experiments in 12.7 mm-thick glass plates, in which a fracture is propagated from a notch at one end of the specimen by application of a transverse load. Fracture propagation velocities of 0.35–2 mm/μs were obtained for fractures in the first configuration. A capacitance transducer with a point-like probe was used for measuring the seismic displacement waveforms from propagating fracture sources. This transducer is capable of measuring absolute surface displacements with a resolution of 0.01 nm. It has a flat frequency response in the range 10 kHz to 6 MHz. Measured seismic efficiencies, or the ratio of radiated seismic energy to strain energy released, are in the range 10−5 to 10−3.

Key words

Tensile fracture glass seismic efficiency 

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Copyright information

© Birkhäuser Verlag 1986

Authors and Affiliations

  • Frances M. Boler
    • 1
  • Hartmut Spetzler
    • 1
  1. 1.Department of Geological Sciences and Cooperative Institute for Research in the Environmental SciencesUniversity of ColoradoBoulderUSA

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