Physics – Geophysics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.3301b&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 24, p. 3301-3304
Physics
Geophysics
25
Tectonophysics: Stresses-Deep-Seated, Seismology: Seismicity And Seismotectonics, Mineral Physics: High-Pressure Behavior, Mathematical Geophysics: Modeling
Scientific paper
Thermal perturbation of mantle phase relations in subduction zones gives rise to significant buoyancy anomalies. Finite element modeling of stresses arising from these anomalies reveals transition from principal tension to compression near ~400km depth, down-dip compression over ~400-690km (peaking at ~550km), and transition to rapidly fading tension below ~690km. Such features, even when complicated by olivine metastability, are consistent with observed patterns of deep seismicity. That such a simple model, neglecting all effects other than buoyancy anomalies due to temperature and to thermal perturbation of olivine phase relations, successfully generates so many observed features of deep seismicity suggests that these buoyancy anomalies are significant contributors to the stress field in subducting slabs. It also suggests that the depth distribution of deep seismicity may largely reflect the state of stress in the slab rather than simply a particular mechanism of stress release.
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