March 6th - Franck Latallerie, Postdoctoral Researcher, University of Reykjavík
Title: New insights into the cooling of the oceanic lithosphere from surface-wave tomographic inferences
Time: 12:30
Place: Askja, 3rd floor meeting room (room 367) and streamed virtually via Zoom:
List of Friday seminars of Institute of Earth Sciences and Nordic Volcanological Center
Abstract:
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.
All are welcome.