Dear All,
We are very pleased to announce the next Landscapes Live online seminar by Gino de Gelder (IRD-Univ. Grenoble Alpes) on Thursday, October 6th at 16:00 CEST (Amsterdam/Berlin/Paris).
"Inverting marine terrace morphology to constrain paleo sea-level"
Abstract: Quantifying paleo sea-level variations is of fundamental importance to understand the complex relations between paleo-climate, -ice-sheets and geodynamics, yet uncertainties prior to the Holocene currently span several tens of meters. The world's coastlines present an enormous geomorphologic dataset of relative sea-level changes, and recent studies have shown how they can be used within forward landscape evolution models. We take a next step, and apply a Bayesian approach to invert the geometry of marine terrace sequences to paleo sea-level. Using a Markov chain Monte Carlo sampling method, we test our model on both synthetic profiles and observed marine terrace sequences from Santa Cruz (Ca, US) and the Corinth Rift (Greece). The synthetic profiles – with known input parameters – show that there are optimal values for uplift rate and erosion rate to obtain a well-constrained inversion. Both the inversion of synthetic profiles and real sequences show how sea-level peaks are easier to constrain than sea-level troughs, but that also solutions for peaks tend to be non-unique. Synthetic profiles and profiles from several sites in the Corinth Rift both show how inverting multiple profiles from a sequence can lead to a narrower range of possible paleo sea-level, especially for sea-level troughs. This last result emphasizes the potential of inverting coastal morphology, suggesting that joint inversion of globally distributed marine terrace profiles may eventually catalyse a better understanding of local/global paleo sea-level and glacio-isostatic adjustments.
The seminar will be live on Zoom and open to anyone interested (limit of 300 participants). Register in advance for this meeting: https://univ-grenoble-alpes-fr.zoom.us/meeting/register/tJIvcOirrT0vHN1kf3FRKeD6POOPHOP3NJcM . After registering you should receive a confirmation email containing the information you need to join the meeting.
More information about the upcoming talks in the Fall Series and recordings of previous talks, please visit our website on www.landscapeslive.org.
Landscapes Live is the EGU Geomorphology Division's virtual webinar series focused on sharing exciting geomorphology research throughout the international scientific community. Feel free to contact us if you have questions or suggestions: landscapeslive@gmail.com
Best wishes,
The Landscapes Live team
Michal Ben-Israel, Rebekah Harries, Pierre Valla, Philippe Steer, A. Rita Carrasco, Lizzie Orr and Boris Gailleton