6. mars - Franck Latallerie, Postdoctoral Researcher, University of Reykjavík
Titill: New insights into the cooling of the oceanic lithosphere from surface-wave tomographic inferences
Tími: 12:30
Staður: Askja, Fundarherbergi á 3ju hæð (herb. 367) og streymt á Zoom:
Listi yfir föstudagserindi Jarðvísindastofnunar og Norræna eldfjallasetursins.
Útdráttur:
How oceanic plates cool and thicken with age remains a subject of debate, with several thermal models supported by apparently contradictory data. Combining a novel imaging technique that balances resolution and uncertainty with finite-frequency surface-wave measurements, we build tomographic model SS3DPacific to revisit the cooling style of the oceanic lithosphere beneath the Pacific ocean. Resolution analysis indicates a strong vertical smearing that biases estimates of the apparent lithospheric thickness, limiting the ability to discriminate between the half space and plate cooling models. Laterally, a pattern of anomalous bands in seismic velocity aligned with fracture zones points to additional lateral complexities in the lithosphere, complicating simple age-trend analyses.
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