In jedem Lehrsemester lädt unser Institut Wissenschaftler mit unterschiedlichem Hintergrund und Fachwissen auf dem Gebiet der Geowissenschaften ein, um ihr Wissen mit seinen Mitarbeitern und Studenten zu teilen. Finden Sie hier heraus, wer im aktuellen Semester am IGMG spricht! (Inhalt in Englisch/Deutsch)

Persönliche Kolloquien finden in Gebäude IA, Raum 02/473 um 16 Uhr statt. Für hybride oder vollständig online abgehaltene Kolloquien wird Ihnen im Vorfeld ein Zoom-Link über Moodle zugesandt.

Sommersemester 2022

Oliver Plümper
Dr. Oliver Plümper

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

Hybrid format / Online über Zoom

Zusammenfassung: 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.


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Dr. Vasiliki Mouslopoulou

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


Zusammenfassung: 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.

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Vasiliki - kolloquium
Dr. Carla Tiraboschi (Universität Münster)

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


Zusammenfassung: tba

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Marc-Alban Millet
Dr. Marc-Alban Millet

Titel: Isotopic tracing of crustal formation and evolution

Hybrid format / Online über Zoom

Zusammenfassung: tba


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Dr. Francesca Miozzi

Titel: tba

Online über Zoom

Zusammenfassung: tba

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Dr. Sujay Ghosh

Titel: Water in the mantle

Hybrid format / Online über Zoom

Zusammenfassung: 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).


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HINWEIS: Persönliche Seminare folgen den 3G-Covid-19-Vorschriften, wonach die Teilnehmer gegen Covid-19 geimpft oder von der Krankheit genesen sein müssen oder sich vor dem Seminar einem PCR-Test unterzogen haben müssen.

Weitere Informationen

Organisatoren des Kolloquiums