12th GRC International Frontier Seminar

"Phase transitions in subduction zones: Stresses, seismicity, stagnation, and structure"

Prof. Craig R. Bina
Professor, Dept. of Geological Sciences, Northwestern University,
Foreign visiting professor, GRC.


14 June 2005　17:00-18:00
Meeting room, 6th floor, Advanced Research Building, Ehime University

　 Mineralogical phase relations in subducting lithosphere differ from equilibrium phase relations in the surrounding mantle, due to low temperatures in the slab. These perturbations juxtapose high-density and low-density material, yielding petrological buoyancy anomalies. The resulting buoyancy forces contribute to the stress fields in subducting slabs, as can be seen in regional and global patterns of seismic moment release. These buoyancy forces may also affect the plate velocities of subducting plates and may also contribute to deflection or stagnation of subducting slabs in the transition zone. In addition to buoyancy anomalies, such thermal perturbation of phase relations also contributes to complexity in seismic velocity structures.

　

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主催：愛媛大学地球深部ダイナミクス研究センター