Seminario: Sonja Aulbach “Properties of Earth’s mantle and subduction zone processes through time: The message from eclogite xenoliths” 07.06.2023
Kimberlite-borne xenolithic (“mantle”) eclogite has been studied for many
decades. Given their origin as mid-ocean ridge basalt and gabbro, such samples
can provide insights into the convecting mantle source from which their igneous
protoliths were derived, and into the conditions during their subduction back into
the mantle. Such applications are contingent on a good grasp of each individual
sample’s multistage petrogenesis, comprising differentiation processes in the
ocean floor, seafloor weathering, metamorphic reactions in palaeo-subduction
zones, and overprint during their later extended residence in the lithospheric
mantle. I will discuss what we can learn from eclogite xenoliths about the
temperature and redox evolution of the convecting mantle from which their
protoliths formed, about the supercontinent cycle from their age distribution, and
about redox conditions and interactions with slab-derived liquids during their
subduction in Archaean and Palaeoproterozoic time.
Seminario: Groundwater – surface water interaction in agricultural landscape: Examples from the Canadian prairies (31.05.2023)
Seminario per la didattica della Laurea Magistrale in Geologia Applicata ad Ingegneria, Territorio e Rischi. Corsi di Idrogeologia Applicata e Modellistica Idrogeologica. 31 maggio 2023, ore 9.30, Aula 9 meet.google.com/sir-eenv-caj
Groundwater – surface water interaction in agricultural landscape: Examples from the Canadian prairies. Prof. Masaki Hayashi - Department of Geoscience, University of Calgary, Canada. https://ucalgary.ca/people/hayashi
From the Theory of Ice Ages to IPCC climate projections - International Science Council, Maria Fernanda Sanchez Goni
Despite improved understanding of global and regional climate change and increased model complexity, the relative contribution of different feedbacks (clouds, ocean circulation, vegetation and its coupling with water and carbon cycles, ice…) continues to vary from model to model, leading to mismatches between climate reconstructions and simulations. Acquiring new Quaternary paleoclimatic records and comparing them with model results is, more than ever, the basic science needed to explain current climate change and improve climate projections.
In this lecture, María Fernanda Sánchez Goñi, Professor of Paleoclimatology, will briefly introduce the discovery of the ice ages, the astronomical theory explaining them, and the unexpected identification of abrupt climate variability (millennial-to-centennial) in the 1980s.
After summarizing the evolution of global climate over the last million year, she will show its impact on different regions of the planet. She will highlight the mismatch between past climates and model simulations and, in particular, the problems linked to modelling regional responses to past global climate changes, for example in monsoon regions.
These issues have strong implications for future climate models, projections of sea level rise and regional impact of climate change. Basic research on the Quaternary is still needed to evaluate model simulations and improve climate projections.
The ballade of noble gases, paleoclimate and Arsenic…
Prof. Dr. Rolf Kipfer - Dept. Water Resources & Drinking Water (W+T)
Swiss Federal Institute of Aquatic Science & Technology (Eawag Swiss Federal Institute of Technology (ETH))
Urban Geo-climate Footprint
Presentazione del progetto “Urban Geo-Climate Footprint”, nato in seno a all’Urban Geology Expert Group di Euro Geo Surveys (https://eurogeosurveys.org/the-urban-geo-climate-footprint/), la confederazione europea dei servizi geologici.
Probing Seismogenic Faults with Machine Learning
We would like to announce that Chris Johnson will give a talk at Sapienza on their recent work to apply Machine Learning techniques for earthquake physics.
Triaxial extension deformation tests on Berea sandstone. Effects of pore fluid pressure on extension and extension-shear mix-mode fractures
10 marzo 2023
Venerdi 10 Marzo 2023 alle ore 11:00 presso l'aula Lucchesi la Prof.ssa HIROKO KITAJIMA della Texas A&M University terrà un seminario dal titolo: Triaxial extension deformation tests on Berea sandstone. Effects of pore fluid pressure on extension and extension-shear mix-mode fractures.
Advances in Global Seismic Tomography With applications in Geodynamics and Mineral Physics
The concept of imaging Earth’s interior based on the full physics of seismic wave propagation was introduced approximately 35 years ago. Thanks to modern numerical methods and high-performance computers, seismic Full Waveform Inversion (FWI) has finally come to fruition in the past decade. Today, FWI is used across nine orders of
frequency and wavelength, from megahertz frequencies and millimeter wavelengths in ultrasound medical imaging and nondestructive testing to millihertz frequencies and thousand- kilometer wavelengths in global seismology. The goal of FWI is to use every wiggle in a seismogram to understand the underlying physics. In this talk I give an overview of the status of global seismic waveform tomography, with applications to problems in geodynamics and mineral physics.