G3 seminar: Seismic imaging of the Icelandic crust: new insights from receiver function analysis
Seismic imaging of the Icelandic crust: new insights from receiver function analysis
Tuesday, June 13, 2017 - 15:00, room 074/02
Dr Jennifer Jenkins; University of Cambridge, Department of Earth Sciences Abstract:
Iceland straddles the mid-Atlantic ridge spreading centre between the North American and Eurasian tectonic plates. It has long been hypothesised to be underlain by a mantle plume – a hot upwelling within the convecting system of the Earth’s mantle. Accordingly, crust produced at the sub-aerially exposed ridge system in Iceland is likely to be anomalous compared to normal oceanic crust. However, since the first measurements were made, the seismic structure of the Icelandic crust has been a long running and controversial debate, with estimates of maximum crustal thickness ranging from 20-40 km in central Iceland.
In this talk I will present new results from seismic receiver function analysis, where several different approaches indicate a multi-layered crustal structure. These results are interpreted as a result of crustal formation in a plume-ridge interacting system.