Transient Creep in Olivine at Shallow Mantle Pressures: Implications for Time‐Dependent Rheology in Post‐Seismic Deformation
Abstrak
Abstract Transient creep in olivine aggregates has been studied by stress‐relaxation experiments at pressures of 1.7–3.6 GPa and at temperatures of ≤1020 K in a DIA apparatus. Time‐dependent deformation of olivine at small strains (<0.07) was monitored with an ∼1 s of time resolution using a combination of a high‐flux synchrotron X‐ray and a cadmium telluride imaging detector. The observed deformation was found to follow the Burgers creep function with the transient relaxation time ranging from 50 (±20) to 1,880 (±750) s. We show that the Burgers creep for olivine cannot account for the low viscosities in early post‐seismic deformation reported by geodetic observations (<7 × 1017 Pa·s). In contrast, the time‐dependent increase in viscosity observed in late post‐seismic deformation (1018−1020 Pa·s) is explained by the Burgers rheology, suggesting that the combination of the Burgers model and another model is needed for the interpretation of post‐seismic deformation.
Topik & Kata Kunci
Penulis (17)
Tomohiro Ohuchi
Yuji Higo
Noriyoshi Tsujino
Yusuke Seto
Sho Kakizawa
Yoshinori Tange
Yamato Miyagawa
Yoshio Kono
Hirokatsu Yumoto
Takahisa Koyama
Hiroshi Yamazaki
Yasunori Senba
Haruhiko Ohashi
Ichiro Inoue
Yujiro Hayashi
Makina Yabashi
Tetsuo Irifune
Akses Cepat
- Tahun Terbit
- 2024
- Sumber Database
- DOAJ
- DOI
- 10.1029/2024GL108356
- Akses
- Open Access ✓