Acoustic emissions produced by anticrack faulting during the olivine-spinel transformation

Details Acoustic emissions produced by anticrack faulting during the olivine-spinel transformation Acoustic emissions produced by anticrack faulting during the olivine-spinel transformation

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..789g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 789-792.

Mathematics

Logic

26

Acoustic Emission, Earth Mantle, Geological Faults, Olivine, Phase Transformations, Spinel, Earthquakes, Structural Properties (Geology), Subduction (Geology)

Scientific paper

Anticrack faulting during the phase transformations of olivine to its denser polymorphs is a principal contender for the mechanism of deep-focus earthquakes. The original work on Mg2GeO4 established that initiation of faulting by this mechanism is not due to brittle fracture, and subsequent experiments on olivine of mantle composition showed that it can operate at pressures of at least 14 GPa. Acoustic emissions accompanying anticrack faulting in Mg2GeO4 are reported, thereby confirming that this mechanism involves a dynamic instability accompanied by elastic radiation.

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