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Institute Seminars

Each teaching semester, our institute invites scientists with diverse backgrounds and expertise in the field of geosciences to share their knowledge with its staff and students. Find out who is speaking at IGMG in the current semester here!

In person seminars will take place in Building IA, Room 01/473 at 16:00. For hybrid or completely online seminars a Zoom link will be sent to you beforehand via Moodle.

Summer Semester 2022

Oliver Plümper
Dr. Oliver Plümper

Title: Fluid-rock interactions within the solid Earth: from transient mineral reactions to seismic chaos

Hybrid format / Online über Zoom

Summary: In this presentation, I will give a brought overview of our endeavours to determine how fluids interact with rocks from shallow reservoir conditions to the deep Earth, from tectonic plate rates to seismic conditions. I will focus on two examples highlighting the multi-scale and transient nature of fluid-rock interactions. First, I will show how we use machine-learning and molecular dynamics simulations to determine scaling behaviours of evolving fluid pathways and the effect of nanoscale confinement on the nature of geofluids. Finally, I will discuss how we utilize in situ stable isotope geochemistry to determine the microphysical processes occurring during seismic deformation in fluid-bearing crustal fault rocks.

 

Find more about our speaker HERE

Mouslopoulou
Dr. Vasiliki Mouslopoulou

Title: Mega-events within the Hellenic Subduction System over a range of timescales

Zoom

Summary: The Hellenic Subduction System (HSS) margin in the Eastern Mediterranean has generated devastating historical earthquakes and tsunamis with poorly known recurrence intervals. Here we show that the earthquake-related uplift pattern on Crete has been more variable and complex than previously thought. Using radiocarbon dates and field observations of paleoshorelines we identify strong uplift transients along the entire island with time-averaged rates varying between 0 and 7 mm/yr. High uplift-rates since the demise of the Minoan civilisation were confined to western Crete, where up to 10 m of coastal uplift resulted from at least one great earthquake. Similar earthquakes produced rapid uplift between 10 and 20 kyr BP in eastern and western Crete, with the absence of uplifted Late Holocene paleoshorelines in the east being due to seismic quiescence. Numerical modelling conditioned by uplift-data indicates that great-earthquakes occurred on major splay-thrust faults within the plate-interface zone, with the plate-interface itself contributing little to the uplift. In contrast to most convergent margins, paleoearthquakes along the southern HSS were strongly clustered in time with recurrence intervals of 100s of years to 10s of thousands of years, reflecting temporal variations in slip partitioning between the subduction-interface and upper-plate faults. We also used geodetic data to constrain the current pattern of interseismic strain accumulation along the southern HSS, as this typically reveals the locus and timing of future large-magnitude earthquakes. Despite its largely aseismic character, modeling of a 10 year record of continuous GPS displacements on Crete and Gavdos reveals two main areas of ‘locking’ south of Crete, at depths between 20 and 40 km. We find slip rate deficits locally reaching ~85% and ~45% of the plate convergence rate on the western and eastern segments, respectively. The along strike heterogeneity in the interseismic strain accumulation is consistent with the millennial uplift pattern revealed from uplifted paleoshorelines. Assuming a constant geodetic moment accumulation rate, the recurrence intervals of large-magnitude (M~8) earthquakes are estimated at ~1500 and ~2000 years along the eastern and western Hellenic forearc, respectively. Although the time elapsed since the large AD 365 event in western Crete is about 1700 years, seismic and tsunami hazard is believed to be more elevated in the east as this segment has experiencing a long period (4 ka) of seismic quiescence.

To find our more about the speaker please click HERE

Vasiliki - kolloquium
Tiraboschi
Dr. Carla Tiraboschi (Universität Münster)

Title: "COH fluids in subduction zones: investigating volatiles-bearing systems in the laboratory"

Hybrid / In person

Summary: tba

To find out more about our speaker please look HERE (external link)

Marc-Alban Millet
Dr. Marc-Alban Millet

Title: Isotopic tracing of crustal formation and evolution

Hybrid format / Online over Zoom

Summary: tba

To find out more about the speaker please click HERE

Miozzi
Dr. Francesca Miozzi

Title: tba

Online over Zoom

Summary: tba

For more information about our speaker click HERE

Ghosh
Dr. Sujay Ghosh

Title: Water in the mantle

Hybrid format / Online over Zoom

Summary: Water (more precisely, hydrogen) plays an important role in most processes within the Earth's mantle and the amount of hydrogen present in the deep mantle is important for understanding the geochemical recycling of volatiles, and the evolution of the mantle, atmosphere, and oceans. Combining experiments, studying the natural samples and inclusions in super deep diamonds; advanced analytical methods such as infra-red spectroscopy and ion probe and computational methods e.g., ab-initio calculations, the mechanism of water incorporation in hydrous minerals likely to be present in the Earth's mantle provide constraints on the distribution of water in the mantle, and the form in which it is stored. In this presentation, I will give a broad overview of the various aspects of water in the upper mantle (30-410 km), transition zone (410-660 km)) and lower mantle (660-2900 km).

 

Learn more about our speaker HERE

Gesa Amstutz
Frau Gesa Amstutz - head of water management from the LINEG

Title: The conflicting priorities of sustainable water management in times of increased hydrological extreme events

Hybrid format / Online over Zoom

Summary:

For more than 100 years, the Linksniederrheinische Entwässerungs-Genossenschaft (Left Lower Rhine Drainage Cooperative - LINEG) has been providing public services in the area covered by the association by regulating the distances between groundwater and surface (approx. 150 pumping stations), pumping watercourses (> 70 pumping stations), ecologically developing watercourses, and removing and purifying wastewater (6 sewage treatment plants). The regulating measures are necessary because coal mining (already stopped) and salt mining (active) cause terrain subsidence, so that the natural receiving water is disturbed, or the distance between groundwater and surface are no longer sufficient.

LINEG's regional tasks are already hydrologically challenged by the consequences of climate change - both by longer dry periods, the observation of falling groundwater levels, and by increased frequency and intensity of heavy precipitation with increased runoff formation and flood risk. LINEG acts and reacts with new, innovative water management approaches, such as digital water management: With this project, networked, predictive operation of selected pumping plants in a pilot area will reduce electricity consumption with non-regenerative components in frequent load cases and supplement the basic operation with regenerative own electricity production from photovoltaics. As a direct consequence, LINEG wants to cumulatively reduce CO2 consumption and create climate impact resilience for the regional water management.

This and other projects to be presented contribute to the success of reducing the area of conflict of sustainable water management in times of increasing hydrological extreme events and to making the LINEG area fit for the future.

 

Learn more about our speaker HERE

NOTE: In person Seminars this semester follow 3-G Covid-19 regulations, whereby attendants need to be vaccinated against or recovered from Covid-19, or been subjected to a PCR test prior to the Seminar taking place. 

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