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Seismic heterogeneity along and across the arc of the Lesser Antilles subduction zone

Seismic heterogeneity along and across the arc of the Lesser Antilles subduction zone
sws:

26.11.2019

Referent:

Dr. Lidong Bie (GPI)

This presentation will be given in english!

 

Subduction zone is one of the key areas for global water recycling. Water is brought down by subducting plates acting like conveyor belt and is partially released and returned to atmosphere during volcanic eruptions. While the water recycling at fast subducting circum-Pacific subduction zones is relatively well studied, such process is less explored in subduction zones with slow spreading ridge. Low spreading rate potentially allows more water being brought down into the mantle lithosphere due to prolonged hydration of the oceanic plate before subducting. The VoiLA (Volatile Recycling in the Lesser Antilles) project looks in detail about seismic structure of the Lesser Antilles subduction zone, where the Atlantic plate subducts at a rate of 20 mm/yr. In this talk, I will report recent progress on the analysis of seismicity and passive seismic imaging. Multiple evidences converge to show that the central part of the Lesser Antilles arc, where Martinique and Dominic islands locate, is more efficient in transporting/releasing water than the northern and southern segments. This is probably due to the subduction of multiple fracture zones that are capable in bringing more water down in this region.