From dstegman at ucsd.edu Wed Nov 3 04:27:10 2021 From: dstegman at ucsd.edu (David Stegman) Date: Tue, 2 Nov 2021 10:27:10 -0700 Subject: [Geodynamics] Postdoctoral Fellowships at IGPP, SIO, UCSD (deadline Nov 14) Message-ID: Please share these fellowship opportunities with potential candidates. people can apply to both if both are relevant. Applicants should contact prospective mentors and identify research areas of mutual interest well before the deadline. https://protect-au.mimecast.com/s/EtvDCE8wmrt3LO8mvhNSvu6?domain=igpp.ucsd.edu https://protect-au.mimecast.com/s/eMsUCGv0oyC1kENmDT7cHft?domain=igpp.ucsd.edu Take care Dave Dave Stegman he/him Associate Professor of Geophysics *Deep Earth Virtual Laboratory* *Institute of Geophysics & Planetary Physics* *Scripps Institution of Oceanography* *University of California, San Diego* *9500 Gilman Drive, Mailstop 0225* *La Jolla, CA 92093-0225* *office:** (+1) 858 822 0767 <%28%2B1%29%20858%20822%200767>* mobile:* (+1) 858 352 8293 <%28%2B1%29%20858%20352%208293>* -------------- next part -------------- An HTML attachment was scrubbed... URL: From bott at gfz-potsdam.de Sat Nov 13 01:34:08 2021 From: bott at gfz-potsdam.de (Judith Bott) Date: Fri, 12 Nov 2021 15:34:08 +0100 Subject: [Geodynamics] EGU22 | Session GD7.5 Physical state of the lithosphere-asthenosphere system: challenges and insights from integration of seismic tomography with potential field and mineral physics data Message-ID: Dear colleagues, we want to draw your attention and invite you to contribute to our EGU-2022 session GD7.5 Physical state of the lithosphere-asthenosphere system: challenges and insights from integration of seismic tomography with potential field and mineral physics data https://protect-au.mimecast.com/s/dVVNCgZ0N1iAQBBEXuNtDuR?domain=meetingorganizer.copernicus.org https://protect-au.mimecast.com/s/xpweCjZ1N7inNOOoLFRf26N?domain=meetingorganizer.copernicus.org *Session description*: The original theory of plate tectonics is a kinematic model with forces only representing qualitative measures. To understand inter- and intraplate dynamics driven by mantle thermodynamics and gravitational forces at interplay with rock rheology, we need comprehensive images of the in-situ material properties (density, viscosity) and underlying state conditions (temperature T, pressure P) of the lithospheric plate and its transition into the upper mantle. One key insight into the mantle physical configuration is provided by seismology, namely tomography imaging of seismic velocity perturbations. The interpretation of seismic velocity in terms of mantle composition and T and P conditions, however, is highly non-unique. Despite an ever-growing data pool of laboratory-derived relations between seismic velocity of mantle minerals and their T and P derivatives of density and elastic constants, inversion of seismological information for in-situ bulk rock T is an ill-posed problem. To reduce the number of potential solutions, we rely on additional independent information on mantle composition, T and P (such as from xenoliths) and mantle density (such as from gravity field data). In addition, effects of anelasticity (e.g., frequency dependent wave velocity), grain size and fluid content should be considered, but these material behaviors are currently less well explored. An alternative to thermodynamics-based inversions is provided by empirical approaches to calculate mantle temperature from seismic tomography models. Finally, the diversity and inconsistency of seismic tomography models for any specific region can result in a correspondingly wide spectrum of derived mantle temperature configurations. With this session we intend to resume open discussions on how to exploit mantle seismic velocity models to derive valuable conclusions on the composition and temperature-pressure conditions within the upper and lithospheric mantle. Thus, we want to focus on those mantle domains revealing the largest rheological variability and exerting strongest impacts on crustal and surface deformation. The session is intended to cover the multi-disciplinary spectrum of observations and interpretations for the upper mantle configuration. We invite contributions addressing state-of-the-art techniques, case studies that combine mantle seismic velocities with seismology-independent observations as well as presentations that highlight the challenges and inconsistencies in the field. *Solicited author*: Saskia Goes Kind regards, Your conveners: Judith Bott, Constanza Rodriguez Piceda, Ajay Kumar, Javier Fullea, Stewart Fishwick -- Dr Judith Bott Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences Section 4.5 Basin Modelling Telegrafenberg 14473 Potsdam Phone +49 (0)331 288 1342 -------------- next part -------------- An HTML attachment was scrubbed... URL: