Dana Silerova
2023-03-22 12:15 - 13:00 (Europe/Oslo) | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Long-lived (180 Myr) ductile flow within the Great Slave Lake shear zone
Dana Silerova
The Great Slave Lake shear zone (GSLsz) is a type example for deeply eroded continental transform boundaries located in the Northwest Territories, Canada. Formed during the oblique convergence of the Archean Rae and Slave cratons, the GSLsz has accommodated up to 700 km of dextral shear, however, the timing and duration of ductile deformation have not yet been directly constrained. New results of in situ U-Pb apatite and titanite geochronology from samples collected across the shear zone record a near-continuous history of ductile shear spanning ca. 1920–1740 Ma, with strain initially being accommodated along two coeval fault strands and later localizing along existing crustal structures during cooling and exhumation

Jokhongir Khayrullaev
2023-03-29 12:00 - 13:00
Exploring subsurface by means of a generalization of Dix’ classic time-to-depth mapping method
Jokhongir Khayrullaev
Primary goal of ongoing the research work is to develop new tools in compressional waves (P-waves) domain for exploring the subsurface by means of a generalization of Dix’ classic time-to-depth mapping method, where velocity estimation constitutes an inherent part. A fundamental idea behind the work is the generalized Dix method, recently published in de Hoop et al. 2014. As the name indicates, it represents a generalization of Dix’ classic method (Dix 1955) for interval velocity estimation and time-to-depth conversion, which has been a cornerstone in the conventional seismic data processing. Whereas the classic Dix method is based on an assumption of a 1-D subsurface, varying only in depth, the generalized method adopts the assumptions of 3-D seismic time migration. That means the subsurface properties may have a quite general variation with depth, while lateral variations are assumed to be weak or moderate.

Tony Doré
2023-03-30 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Continental-scale strike-slip faults and their influence on Atlantic and Arctic break-up
Tony Doré (EGI,Uni of Utah)
Abstract:
An idea that has wide currency in plate tectonics is that extending continental margins will undergo gradual stretching, including the exhumation of continental mantle, unless affected by an extraneous heat source, for example a mantle plume, forming a magma-rich margin. Such margins are typically more abrupt and characterized by seaward-dipping reflectors and underlying high-velocity intrusions. We propose an alternative, or additional mechanism for such margins involving the reactivation of continental transform or transcurrent faults, structures of lithospheric scale originally formed during continental assembly. In this concept. rapid development of abrupt margins results in significant lateral thermal gradients, triggering melt formation. The mechanism also explains the curious near-absence of pre-breakup extension at many such margins, and the frequently short-lived nature of the subaerial magmatic episode prior to the formation of normal oceanic crust – even at margins proposed to be under plume influence. These ideas are supported by lithospheric modelling, by examination of “leaky” transforms in the oceanic and continental domains, and by case-studies from the Arctic and North-Central Atlantic.
Bio:
Tony Doré held senior geoscience and leadership positions with ConocoPhillips and Equinor, and on retirement from Equinor joined the Energy and Geoscience Institute as Global Chief Scientist, based in London. His career involved a long period in Norway, where he formed strong links with universities such as Bergen, Oslo and Tromsø. This association continues with his current role as advisor to postdoctoral work in Bergen. He has worked, and published on, basins all over the world, with emphasis on NW Europe, Arctic and the Americas. Present interests include tectonic evolution of the Arctic, Gulf of Mexico, transform margins, cratonic basins and exploration risk analysis. Tony was recently appointed as Executive Editor of the diamond open access structural geology journal, Tektonika.

EGU practice talks
2023-04-19 12:00 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Thomas Theunissen
Oblique continental rifting. Insights from 3-D forward coupled geodynamic-surface process modelling and application to the Equatorial passive margins formation

Leonardo Pichel
Geodynamic modelling of salt-bearing rifted margins: from minibasin- to margin-scale salt tectonics across different margin types
The Inception and evolution of wide salt-bearing rifted margins – insights from numerical modelling and natural systems

Gang Lu
Three-field finite-element modelling of coupled two-phase flow for geological problems: Towards the zero-porosity limit

Melanie Kling
Weathering response of a clastic source-to-sink system to extreme environmental perturbations: the Permian-Triassic transition on Finnmark Platform, Barents Sea

Lucas Valore
Control of dynamic uplift on paleogeography and sediment volumes: insights from the East Shetland Platform in the Paleocene

Sebastian Wolf
The Beaumont number of mountain belts – quantifying the interaction between surface processes and tectonics during orogenesis

Mike Hudec
2023-04-28 12:15 - 13:00
Interaction between salt and mobile shale in the East Breaks foldbelt, Northwestern Gulf of Mexico
Mike Hudec
Bio:
The main focus of my research is salt tectonics, particularly kinematic models for evolution and growth of salt structures. This interest began upon my arrival at Exxon Production Research in 1989, when I was informed that I would be the company’s new expert on salt tectonics despite the fact that I was almost completely unfamiliar with the topic. The learning curve was quite steep at first, but as time passed I became progressively more enamored with salt deformation. After a 3-year stint teaching structural geology at Baylor University, I moved to Austin in 2000 to join the Applied Geodynamics Laboratory, an industry-funded research consortium studying salt tectonics. I have been codirector of the consortium since 2002.
My current research is focused on three topics. First, I am investigating the influence of basement structure and basement reactivation on salt tectonics, especially on passive margins in Brazil, West Africa, and the Gulf of Mexico. Second, I am interested in the emplacement and deformation of allochthonous salt sheets and canopies, mostly in the Gulf of Mexico. Finally, Martin Jackson and I are in the process of writing a textbook on salt tectonics and the seismic interpretation of salt structures.

Helene Meling Stemland
2023-05-03 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Passive seismic monitoring of an arctic glacier
Helene Meling Stemland
Widespread glacier loss is observed in the Arctic region, partly caused by rising surface temperatures. Calving, which is the mechanical break-off of ice at the glacier terminus, is important to monitor to estimate the potential sea level rise due to glacier mass loss, but is difficult due to the remote and seasonally dark locations of many glaciers. To overcome this challenge, the field of cryoseismology, where seismic waves from glacial environments are recorded and analyzed, is expanding. In this talk, I will describe the details of two seismic experiments we have conducted at a partly marine-terminating glacier on Svalbard. We placed seismic receivers on land and at the seabed in front of the glacier, and passively monitored the glacier for up to five weeks. We recorded seismic signals attributed to calving, fracturing/crevassing, and tectonic earthquakes. Here, I will talk about the challenges involved in the seismic campaigns, lessons learnt, and share some of the preliminary analysis of the data.

Matteo Ravasi
2023-05-04 14:15 - 15:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Seeing through the CO2 plume: joint-inversion segmentation of the Sleipner 4D dataset
Matteo Ravasi
4D seismic inversion is the leading method to monitor fluid flow dynamics in the subsurface, with applications ranging from enhanced oil recovery to subsurface CO2 storage. The process of inverting seismic data for reservoir properties is, however, a notoriously ill-posed inverse problem due to the band-limited and noisy nature of seismic data. This comes with additional challenges for 4D applications given inaccuracies in the repeatability of the time-lapse acquisition surveys.
If you want any further information on this talk or want to meet with Matteo, then get in touch with Isabelle Lecomte (Isabelle.Lecomte@uib.no).

Martin Muravchik
2023-05-10 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
AUV High-Resolution Bathymetry Of Axial-Transverse Drainage Interaction In The Structurally Controlled Subaqueous Channels In The Gulf Of Corinth, Corinth Rift, Greece
Martin Muravchik
New high-resolution (submeter) bathymetric data, acquired using an AUV Hugin 1000, from the Gulf of Corinth, Greece reveals unprecedent detail on the interaction between transverse and axial submarine channels in an active rift. The dataset presented was acquired using the EM2040 Multibeam Echosounder on the AUV at 300 and 400 kHz, navigating between 100 and 50 m above the seafloor. The surveyed area lies towards the western part of the Gulf of Corinth, offshore of the coastal towns of Aigio and Akrata. The area is characterized by the development of coarse-grained deltas sourced by north-flowing rivers draining the mountain ranges. The seafloor morphology shows the presence of active canyons, ca. 100 m deep, draining from the delta fronts towards north in water depths between 100 to 600 m, interacting with an axial trunk channel in water depths between 550 to 650 m, draining towards east, and which looses its expression in water depths between 700 and 800 m. These submarine channels show a strong structural control in both position and orientation by the normal faulting affecting the present-day Gulf of Corinth sea-floor. This survey includes the mapping of the three submarine tributaries derived from the Soulinous, Kerinitis and Vouraikos deltas and their link into the axial trunk channel. The survey shows the presence of large erosional scours in the axial channel, at the confluence with of some of the tributaries. This, together with the pervasive erosional features developed on the axial channel base and margins towards its exit onto the basin-floor, reveal the development of complex erosive flow patterns due to changes in the gradient of the sea-floor and the orientation of channel margins at the confluences between the tributaries and the axial channel.

Tena Belinić Topić
2023-05-11 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Exploring the lithospheric structure beneath the Dinarides using seismograms of teleseismic earthquakes
Tena Belinić Topić
The Dinarides are a mountain range located in southeastern Europe with significant tectonic activity and complicated geologic history shaped by the collision of the Adriatic microplate and the European mainland. There are numerous open questions about the current state of interaction between Adria and Eurasia under the Dinaric domain. One of the most interesting is the nature of lithospheric underthrusting of the Adriatic plate, e.g. length of the slab or varying slab disposition along the orogen. In this talk, I will describe two recent studies made to investigate the Dinaric upper mantle structure. In the first study we used S receiver functions to obtain the lithospheric thickness, while in the second one, we used the dispersion of Rayleigh waves to create a 3D shear wave velocity model. I will discuss the results of them in the context of regional tectonics.

David Whipp
2023-05-24 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
David Whipp
Can it be all so simple? Challenges and considerations applying thermochronology to understand crustal dynamics
Speaker is David Whipp
Professor, Department of Geosciences and Geography
Institute of Seismology
Helsinki Institute of Sustainability Science (HELSUS)
Supervisor for doctoral programme, Doctoral Programme in Geosciences
https://orcid.org/0000-0002-3820-6886

Iva Dasović
2023-05-31 00:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
The Berkovići (BIH) ML = 6.0 earthquake sequence from 22 April 2022
Iva Dasović
In the southern External Dinarides, and in the SE of Bosnia and Herzegovina, the Berkovići earthquake sequence started with the mainshock on 22 April 2022 21:07 UTC at focal depth 22 km with magnitude ML = 6.0 (Mw = 5.7). Preliminary estimation of the mainshock’s maximum intensity is VII EMS for Berkovići where 29% of buildings were damaged, and in Stolac a 28 y. o. woman lost her life to a rockfall caused by an earthquake. We analysed the first nine months, 22 April 2022 – 22 January 2023, of this sequence: seismicity and focal mechanisms, and we constructed a regional seismotectonic cross-section to delineate a potential seismogenic source of the mainshock.
Iva Dasović is an Associate Professor at the Andrija Mohorovičić Geophysical Institute, Department of Geophysics, at the University of Zagreb. She is visiting the department until 11th July, so if you would like to talk to her during that time please do not hesitate to get in touch, e.g., during the Geolunch, by email or in her temporary office 2F13c. This visit is organized as part of the CRONOS project that focuses on the Investigation of seismically vulnerable areas in Croatia and seismic ground motion assessment, and where Stéphane is involved as a partner here from GEO.

MSc “feedback”
2023-06-07 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
MSc “feedback”
Tor-Sebastian Rønneberg – “Fault crest stability during rifting” (Supervised by Haakon Fossen)
Synnøve Sørvåg Slåtsveen – “Improving interpretation of 3D Ground Penetrating Radar data in archaeology via attributes developed in seismic application to selected Norwegian sites.” (Supervised by Isabelle Lecomte)
Kristel Kaselaan – Detecting desalinisation in quick clays: geochemical analysis and interpretation of porewater data (Supervised by Elco Luijendijk)

Gerard Dam and William Helland Hansen
2023-06-09 14:00 - 15:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
1st presentation
Morphological modelling of rivers, tidal basins, and seas
Gerard Dam
UN-IHE (Delft) / COWI (Bergen) – gedm@cowi.com
In the last decades (process-based) morphological models have become popular tools in science and engineering to simulate sediment transport and bed level changes in rivers, tidal basins, and seas. With growing computational capacity, the capabilities of these models have become large. Now it is possible to model several hundred to even thousands of years of geomorphological changes with high resolution. Modeling long-term effects of human activities, climate change and sea level rise are themes that are investigated with these kinds of models. In this presentation I will show several examples of morphological modelling, how they work, how good they are on the long term and what is possible with these models.
2nd presentation (IAS practice session) 15 minutes
Coastal Changes in the 21st Cenutry: A sedimentology-perspective
William Helland Hansen

Gang Lu
2023-06-14 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Two-phase flow modelling for geological problems: Background, method, and applications
Gang Lu1,* Dave A. May2, and Ritske S. Huismans1
1Department of Earth Science, Bergen University, Bergen, N-5007, Norway
2Scripps Institution of Oceanography, UC San Diego
*Corresponding author: gang.lu@geo.uib.no
Two-phase flow, a system where Stokes flow and Darcy flow are coupled, is of great importance in Earth sciences. Examples of two-phase system include water migration in sedimentary basins/subduction zones/glaciers, and magma migration in subduction zones/mid-ocean ridges/hotspots. While the governing equations of the coupled two-phase system have been proposed long time ago, it remains challenging to solve the coupled system accurately in the zero-porosity limit, for example when melt is fully frozen below solidus temperature. In the limit when fluid phase is absent, the Darcy equation is redundant such that the coupled system becomes underdetermined. Here we propose a new three-field formulation of the two-phase system and present a robust finite-element implementation, which can successfully solve for the system where zero and non-zero porosity domains are both present. The new formulation is implemented using a 2-D finite-element discretization in FANTOM. We demonstrate the correctness of our implementation based on benchmarks against analytical solutions, which gives expected convergence rates in both space and time. We further present a number of example experiments, such as self-compaction, falling block, and mid-ocean ridge spreading, showing that this approach can robustly resolve zero- and non-zero-porosity domains simultaneously, and be used for a large range of applications in various geodynamic settings.

Prof Zoe Shipton & Prof Clare Bond
2023-06-15 14:00 - 15:00 | Auditorium 5, 3rd floor, Realfabyyget, 41 Allégaten, Bergen, 5007, Norway
Extra-ordinary Geo-lunch seminar

This week Prof. Zoe Shipton and Prof. Clare Bond are at GEO in connection with Vilde Dimmen’s PhD defense on Friday.

The hydraulic evolution of fracture networks under dynamic loading
Zoe Shipton, Department of Civil and Environmental Engineering, University of Strathclyde

Reflections on uncertainty in fault interpretation in seismic image data
Clare Bond School of Geosciences, University of Aberdeen

Frank Peel & Gillian Apps
2023-07-04 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Frank Peel & Gillian Apps (UT Austin) are visiting UiB this week and will give two talks.
1. Modern deposition on active salt, Iran – analog for North Sea Triassic? by Gillian Apps
2. Shallow or deep basin? What the paleo landscape seen on base Louann Salt reveals about salt deposition (Gulf of Mexico) by Frank Peel

Felix Halpaap
2023-08-23 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Unearthing a link between old and new plate boundaries and present-day seismotectonics of Svalbard: First insights from the new high-res 700k earthquake catalog of the European plate’s far North
Abstract:
Oceanic ridges and transform faults comprise nearly 45% of the Earth’s plate boundaries. Even though they have lower seismic moment release rates than convergent plate boundaries, these intricately segmented oceanic plate boundaries host a large part of Earth’s seismicity. Analyzing how their segmentation is expressed through their seismic behavior has not been commonly possible due to limited observations compared to plate boundaries on land. This knowledge gap has also hampered efforts to understand the causes of seismicity in regions adjacent to the plate boundaries, such as the Svalbard archipelago. A challenge for these remote areas is that there is often no overlap between event catalogs produced routinely from regional networks (typically with M>3.5) or from short local deployments (M<3). To close this gap, we apply a sensitive earthquake detection pipeline to complement a regional catalog over 25 years through HPC-supported template matching. We focus on the 3000 km of oceanic plate boundaries and adjacent areas in the European Arctic (68° – 87°N, 20°W – 40°E). From an initial dataset of 35k earthquakes, we obtain a new catalog of 700k events, including 150k events with high-resolution relative locations and ~80k glacial events. In this talk, I present this new data product with a focus on four areas where our analysis has unearthed completely new faults and seismicity patterns: (i) the amagmatically rifting Lena trough, (ii) the ultraslow-spreading Mohn and Knipovich ridges, (iii) the transform fault-bound Molloy deep, (iv) and the transtensional fault arrays of Nordaustlandet and Spitsbergen. We correlate the latter fault patterns with former plate-bounding thrust faults of the Timanian orogeny and compare the seismicity patterns with those found in transtensional settings along the San Andreas fault. Since this catalog contains far more new seismicity features than one can analyze alone, we invite everyone to explore this unique data product and to discuss new findings in the light of geodynamics and plate tectonics, field and structural geology, ridge tectonics and volcanism, and other phenomena such as methane seeps and glacial activity on Svalbard.

William Helland-Hansen
2023-08-30 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
100 Best Geosites of Norway

Melanie Kling & Lucas Valore
2023-09-13 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Where do they come from? Where do they go? Diamonds in Namibia
An indoor fieldtrip to Southern Namibia
by Lucas Valore and Melanie Kling
This May, Lucas and Melanie have had the opportunity to participate in a source-to-sink fieldtrip to Namibia as part of their training. There they saw and discussed where the source of the diamonds is, how and when they have been transported, and where they were finally deposited. During the fieldtrip they investigated locations in the Namibian desert and even the restricted government-controlled area, the Sperrgebiet, where the diamonds are currently mined.
This Wednesday they present some MARVELOUS photos from the fieldtrip and speak about the story of the diamonds. An important objective of source-to-sink studies is to disentangle overlapping forcing parameters and their individual impacts for stratigraphic and paleogeographic evolution. Therefore, they will also discuss a potential tectonic or climatic control behind the transport and deposition of the diamonds. Additionally, they promise
big outcrops due to minimal vegetation,
occasional antelopes and a story involving jackals,
spy-pictures from the diamond mines, and
insights on how the diamonds are mined.”

Christian Eide
2023-09-20 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
soon…

Andreas Alexander
2023-10-04 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
The Hunt for Water: glacier hydrology on Svalbard
My name is Andreas and my research focus is within glacier hydrology with an interdisciplinary approach. Originally from Germany, I did my masters in mechanical engineering in Germany and at UNIS working on thermodynamical FEM glacier modelling. Afterwards I did my PhD at the Department of Geosciences at the University of Oslo about glacier channel hydrology on Svalbard, as a combination of field-based observations (summertime surface work and speleological investigations in wintertime) and the development of drifter technology. As I finished my PhD early, I could spend the last year of my contract in Oslo, building up several field-based projects on Svalbard, investigating marine ecosystem and glacier dynamic impacts of a glacier lake outburst flood, the rapid disintegration of a tidewater glacier tongue based on bathymetric data and ice-ocean interactions at Austfonna.
During the past year, I worked part-time at the Centre of Biorobotics at Tallinn University of Technology, continuing the work on my own projects and working on several proposals to increase monitoring capabilities at ice-ocean interfaces.
I have just joined UiB as an outgoing SEAS Postdoctoral Fellow to work on nutrient transport by buoyant meltwater plumes to fjord ecosystems in Greenland. This work will be part of the Climate Narratives project with Kerim. The outgoing phase will be one year at the Scripps Institute of Oceanography in California and one year in Greenland.
Besides my scientific work, I’m heavily involved in scientific outreach and guiding in both the Arctic and Antarctica. Especially my work as expedition leader of small expedition vessels (e.g. National Geographic) has given me access to and insights into some of the remotest places in the polar regions. You can find Andreas in his office on the second floor.

Kurt Henrich Wogau Chong
2023-10-25 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Tlateles, gardens, chinampas and swamps. The Basin of Mexico more than a lacustrine landscape
Kurt Henrich Wogau Chong
The endorheic Basin of Mexico (BM) is characterized by a heterogeneous landscape that comprises volcanic and tectonic structures and a diversity of depositional systems that include glacial, alluvial, fluvial, eolian, and lacustrine sediments. The alluvial plains around Lake Texcoco are complex features formed by medium to low-order fluvial drainages. Additionally, the structure of these plains is complicated by the influence of springs and wetlands, many of which are associated with archaeological sites of various periods. The proposed work aims to study the landscape evolution of floodplain areas in tandem with human occupations spanning the preceramic, agricultural, and Aztec periods on the eastern side of Lake Texcoco. A paleo landscape reconstruction will be performed using the floodplain sediments of San Bernardino and Chapingo fluvial systems as natural archives and the archeological record from the Texcoco Man pre-ceramic burial site.

Nina Hećej
2023-11-01 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Coseismic Ground Failures of 2020 Petrinja Earthquake & Plans for PhD adventure
Nina Hećej
At the upcoming Geolunch event, I will introduce myself through a two-part presentation. Within the first part, I will discuss prior research on coseismic ground failures that followed the 2020 Petrinja earthquake in Croatia. While I’ll cover all observed processes, I’ll primarily focus on sand boils, lateral spreading, subsidence (resulting from liquefaction), gravitational movements on slopes, and the sudden emergence of numerous collapse sinkholes. This will be followed by a brief overview of my PhD research proposal, highlighting the intended data and methodologies. I am looking forward to holding the presentation, and even more to your questions and comments, especially for the latter part.

Wojtek Nemec Memorial
2023-11-09 12:15 - 13:15 | Auditorium 4
Wojtek Nemec Memorial Geolunch programme
This geolunch hosts a session dedicated to former GEO Professor, Wojtek Nemec, who sadly passed away last month. Wojtek arrived at UiB in 1984 and became a full professor in 1993 where he supervised more than 50 MSc and 20 PhD candidates to the competition of their degrees until his retirement in 2017. Alongside this he maintained outstanding research work making him an internationally renowned sedimentologist focussed on mass flows, slope process and conglomerates. After hearing the news of Wojtek’s passing, Flavio approached us with the excellent idea to host a memorial seminar hosting some former colleagues of Wojtek. The session will contain a short video interview with Ron Steel, former NorskHydro researcher, UiB professor and now Emeritus at UT Austin who hired Wojtek, some words from colleagues at UiB (William Helland-Hansen and Atle Rotevatn) followed by some short talks of memories from some of Wojtek’s former colleagues (Sergio Longhitano, Massimiliano Ghinassi and Katarina Gobo).
1215: Atle opening remarks
1225: Ron Steel Interview
1235: William Helland Hansen
1245: Sergio Longhitano, Massimiliano Ghinassi, and Katarina Gobo

Thomas Theunissen
2023-11-15 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Basin evolution of the Central South Atlantic wide rifted margins, insights from 2-D geodynamic modelling
Thomas Theunissen
The thick late syn- to early post-rift shallow water evaporites in the most distal part of wide rifted margin is paradoxical with the deep depression at crustal breakup time predicted by isostatically compensated lithospheric thinning models.
Elevation of the distal margin and water depth during deposition of the late syn-rift evaporites and early post-rift carbonates in the central South Atlantic are not well constrained and remain to be quantified.
We use forward 2-D thermo-mechanical modelling coupled with melt prediction and surface processes to assess the contribution of lithospheric and mantle processes on the distal margin topography and subsidence history during continental rifting.
Model results show that (1) counter-flow of depleted lower lithospheric mantle during rifting explains the magma-poor nature of these margins and (2) weak crust and syn-rift sediment control the crustal necking width and subsidence history of the distal margin.
Thin syn-rift sediments (~2 km) result in a deep air-loaded (-2000 +/- 200 m below global sea level (bsl)) distal margin while thick syn-rift sediments (~ 6 km) result in a shallower (-500 +/- 150 m bsl) elevation.
Integration of our modelling results with quantified geophysical and geological observations suggests that (1) base level was down to -600 m bsl during distal margin formation in the Aptian before sag and evaporite deposition, (2) base level was about -300/-400 m bsl at the end of evaporite deposition, and (3) scenarios with a fixed shallow base level (-400 m bsl) and with an increasing base level from an initially deep position (-1600 m bsl) during evaporite deposition can both fit the observed evaporite distribution.
However, erosional features along the base of evaporites suggest a deep initial base level.

Gabriela Wale Soto
2023-11-22 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
“They always say ‘it’s this new thing we have to do’, when… it’s been there for years!”: An institutional ethnography of Equality, Diversity and Inclusion work in a Norwegian university.
Gabriela Wale Soto
In this presentation, Gabriela (guess PhD researcher from the Department of Education, UiB) will talk about her project investigating the doing of ‘likestilling, mangfold og inkludering’ in the university. She will discuss her methodology as well as some preliminary findings. Questions, comments and thoughts welcome.

Lucie Alain
2023-11-29 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Insights on the sedimentology of a Late Precambrian turbidite system –Kongsfjord Formation; Varanger Peninsula
Lucie Alain
I will give a brief overview of some of the amazing geology of the Varanger Peninsula followed by some insights on the sedimentology and architecture of the Late Precambrian Kongsfjord turbidite system. Cool photos from the field will be included! I am looking forward to see you there!

Hakan Heggernes
2023-12-06 00:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Insights into deformation band networks: Spatial variability in topology, connectivity and permeability
Hakan Heggernes
I will give a talk on my first PhD-paper, which was recently published. In this paper we characterize networks of deformation bands from an amazing outcrop close to the San Rafael Swell in Southeastern Utah. Here we use topology to assess deformation band intensity, network connectivity and effective permeability of deformation band networks. We also explore the spatial variability of such networks, and how these properties might affect a subsurface reservoir. See you on Wednesday!
Paper abstract:
Networks of deformation bands have the potential to act as baffles to fluid flow, yet little work has been devoted to addressing their network properties, such as topology and connectivity. Motivated by this, we investigate the two-dimensional spatial variability of areal intensity, node and branch topology, and network connectivity within select deformation band networks in the Jurassic Entrada Sandstone (Utah). The results highlight distinct topological signatures for deformation band networks, dominated by Y-nodes, and IC- and CC-branches. Low proportion of isolated II-branches reflects the evolution of deformation bands through bifurcation and abutment (Y-nodes) to form interconnected networks. A key observation is that network connectivity and topology exhibit great spatial variability within one and the same deformation band network. We evaluate effective permeabilities across the deformation band network, incorporating a topological measure of network connectivity into the permeability calculations. Results highlight that deformation band networks with >1.5 connections per branch can significantly reduce effective permeabilities, whereas networks with low connectivity may offer pathways for tortuous fluid flow.

Rolf Mjelde
2023-12-13 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
The History and Evolution of Marine Geophysics at GEO: from 1960 to present
Rolf Mjelde
This contribution primarily presents the development of Solid Earth land and marine geophysics at the University of Bergen from 1960 until the present. A large number of projects employing controlled seismic sources have been conducted, and some of these were important for the development of plate tectonics from hypothesis to scientific theory. The most important project conducted was the Continental Shelf Project (1961-1981), with yearly acquisition of marine multi-channel seismic data along the entire Norwegian continental shelf and southern Barents Sea. That project was motivated by earlier smaller projects that documented thick sedimentary sequences off the Møre coast and in the Skagerrak. This combined mapping and basic research work provided the foundation for Norway as an oil-and-gas nation. The contribution to society from the marine geophysical environment at the University of Bergen has not only been their own research, but equally much the geophysical education they have provided for their students. The most successful among these have created tens of thousands of jobs through the development of e.g. 3D, 4D and 4C seismic. The instrumentation and methods developed with contribution from the University of Bergen have not only relevance within exploration and production of hydrocarbons, but also for the green transition, e.g. within storage of CO2, mineral exploration and seafloor stability evaluation for installation of windmills offshore. The same seismic methods are extensively used within climate research.

Liviu Giosan
2024-01-10 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Morphodynamic Foundations of Coastal Sumer
Liviu Giosan
The world’s first cities and states, in their modern definition, developed from 6000 to 5000 years ago in Mesopotamia near the coast of the Persian Gulf, on the combined delta of Tigris and Euphrates. Despite more than 200 years of research their emergence remains enigmatic. Here I discuss the environmental context for coastal Sumer based on recent drilling-based work in Iraq and propose a new morphodynamic theory for urbanization.
