Plastic instabilities: implications for the origin of intermediate and deep focus earthquakes

B. E. Hobbs, A. Ord

Research output: Contribution to journalArticlepeer-review

130 Citations (Scopus)

Abstract

Adiabatic or catastrophic plastic shear has been reported in metals, polymers, and metallic glasses. The phenomenon is associated with rapid stress drops and audible pings or clicks as the material deforms in a plastic manner. The driving force for the plastic instability is the stored elastic strain energy of the loading system, and in many respects the behavior is reminiscent of the shear stress response arising from stick slip events during unstable frictional sliding, although the precise mechanism is different. It is shown here that adiabatic plastic shear is capable of explaining the detailed distribution of intermediate and deep focus earthquakes within subduction zones, the earthquake events being the result of instabilities in material undergoing plastic flow. -from Authors

Original languageEnglish
JournalJournal of Geophysical Research
Volume93
Issue numberB9
DOIs
Publication statusPublished - 1 Jan 1988
Externally publishedYes

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