Atle Rotevatn
2024-01-17 12:15 - 13:00 (Europe/Oslo) | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Deformation and slip localization in porous volcaniclastic rocks: tuff adventures in eastern Taiwan
Atle Rotevatn
Taiwan features some of the highest uplift rates, and highest erosion rates in the world. With that comes growing mountains, rapidly incising river gorges, highly active surface processes and related geohazads, all of which makes this a very interesting place to any geoscientist. Eastern Taiwan also features an accreted island arc complex, where volcanism that occurred approximately 5 million years ago has produced an absolutely awesome succession of volcaniclastic deposits knowns as the Shihtiping Tuffs. This succession has been deformed at relatively shallow burial depth during ongoing plate convergence, and between 2015 and 2017 I had the pleasure of spending three field seasons with students from UiB and colleagues from the University of Bordeaux and the National Taiwan University in that area. In the years that have followed, more people have become involved, and in this talk I will talk about the deformation features we see in the Shihtiping Tuffs, and what they can teach us about deformation mechanisms and controls on slip localization in such rocks.

Leonardo Pichel
2024-01-24 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Advances on Rifted Margin Salt Tectonics – insights from numerical modelling and seismic data
Leonardo Pichel

Natacha Fabregas
2024-01-31 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Ongoing IODP Expedition 401
Natacha Fabregas
This week the geolunch will host a video call with the ongoing IODP Expedition 401. In the session they will give us a tour of the JOIDES Resolution research dill ship, and update us on some of the work that has been going on in the Gulf of Cadiz and Gibraltar Strait on the current IODP expedition 401, where UiB PhD student Natacha Fabregas is part of the scientific crew. You can find out more about the expedition here: https://iodp.tamu.edu/scienceops/sitesumm.html
Join Zoom Meeting
https://us02web.zoom.us/j/81828633555

Prof Derek Schutt
2024-02-05 13:15 - 14:30 | Jøkulen (2nd floor classroom), Allegaten 41, Bergen, 5020, Norway
The Enigmatic Mackenzie Mountains
Prof Derek Schutt, from Colorado State University
Global-scale seismic velocity models of the Northern Canadian Cordillera show high velocities to the east of the Cordilleran deformation front and low velocities to the west. This velocity contrast is consistent with other geophysical observables, such as regional seismological studies, that indicate a weak and thin lithosphere to the west that transitions quickly to a strong and thick craton-like lithosphere at the deformation front. We present new results using data collected by the Mackenzie Mountains EarthScope Project, which included an ~875 km-long line of 40 broadband seismographs across the Cordillera and into the craton extending from roughly Skagway, Alaska to Great Bear Lake, Northwest Territories. The 3-year overlap of this deployment with other broadband seismic stations in the region, most notably the EarthScope Transportable Array and the Yukon Northwest Seismic Network, allows for detailed imaging of the upper lithosphere. Results show large velocity variations west of the deformation front. Notably, we image a 5% Vs low that extends from the upper crust to the asthenospheric mantle. This plume-like structure, and associated weakening, may be a primary cause for the ongoing uplift of the Mackenzie Mountains at their unusually eastward location. We also image a low velocity feature in the lower crust extending to the west of the deformation front, which may facilitate eastward crustal translation along a large-scale (~800 km) decollement system driven by the Yakutat indentor consistent with the orogenic float hypothesis of Mazzotti and Hyndman (2002). We note strong lithosphere-scale lateral heterogeneity suggesting that 3-D effects are important in focusing deformation in the Mackenzie Mountain area.

Carbon Capture and Storage (CCS) projects
2024-02-07 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Carbon Capture and Storage (CCS) projects
(1) Insights into CO2 storage using the FluidFlower
by Espen Tjessheim (Master student project)
5-10 min, more details there
(2) Building confidence in subsurface geological carbon dioxide storage
by Md Jamilur Rahman (New post-doc at UiB)

Peter Hanssen
2024-02-14 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Marine Vibrators and Advances in Offshore Seismic Technologies
Peter Hanssen
Marine vibrators have been developed and tested by several companies in recent years and it is anticipated that a commercial system will be available as early as next year. The new, more environmentally friendly sources are also more efficient and could provide better data in the overall picture of offshore robotization. This presentation will give an overview of the technology, its advantages over airgun-based sources, and new challenges concerning processing and acquisition.

Matteo Demurtas
2024-02-21 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
A thirsty fault: prolonged fluid flow along the Helmsdale Fault
Matteo Demurtas
Within syn-rift basins, the juxtaposition of rift-related clastic deposits in the hanging wall of basin-bounding normal faults against crystalline basement is a recurrent structural setting where plays can be found. Here, fault-controlled fluid flow can exert a major role on fluid pathways by means of mineralization and cementation of the host rock.
The Helmsdale Fault in NE Scotland is an excellent exhumed example of a syn-rift basin bounding fault, where timing and paragenesis of fluid flow can be studies in details. The Helmsdale Fault bounds the western side of the Inner Moray Firth Basin in NE Scotland, which developed during rifting in the Late Jurassic. The hanging wall of the Helmsdale Fault consists of Late Jurassic Helmsdale Boulder Beds that are made of alternating debris flow to fault scarp deposits, whereas the footwall is composed of the Helmsdale Granite (Silurian-Devonian in age). Significant fluid flow along the Helmsdale Fault is testified by widespread calcite veining, locally making up to 5 m thick fault cores of stacked veins. A complete suite of microanalysis including optical microscopy, clumped isotope, geochronological analysis as well as fluid inclusion analysis suggests a high variability in time and space of fault-controlled fluid flow, and possibly a more complex deformation history than what previously though.

Harya Nugraha
2024-03-06 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Taking a Closer Look at Mass-transport complexes (MTCs): Their Dynamics and Architecture
Harya Nugraha
Mass-transport complexes (MTCs) are common features in deep-marine environments. Their emplacement can catastrophically displace sediment to continental slope and basin floor, and have a direct impact on society by generating tsunamis and destroying offshore infrastructure. The proliferation of high-resolution multibeam bathymetry and three-dimensional seismic reflection data have improved our understanding of their internal form and emplacement processes. However, uncertainties remain in terms of: (i) how the volume and flow behaviour of MTCs evolve during their translation, and what controls these changes; (ii) how strain is distributed within MTCs, and its relationship to their internal architecture and geometry; and (iii) what are the implications of MTC emplacement processes for geohazard risk and petroleum system assessments in sedimentary basins. To address these problems,three-dimensional seismic reflection, well, and bathymetry data from the Exmouth Plateau (offshore NW Australia) and the Makassar Strait (offshore Indonesia) are used. This study demonstrates that: (i) dynamic interaction between mass flows and substrate lead to the final volume is three times the initially evacuated volume on average, and the formation of intra-MTC flow cells that can translate with a different speed and runout distance; (ii) strain distribution of an MTC is variable along strike, resulting in the variations of internal architecture and frontal geometry, partly controlled by the basal shear surface depth and morphology; and (iii) changes in MTCs volume and flow behaviour should be considered for tsunami and impact modelling, and heterogeneity of MTCs should be characterised when evaluating their reservoir and seal potential for hydrocarbon systems.

Eric Deal & Jean Braun
2024-03-14 12:00 - 13:10 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Eric Deal (ETH Zürich, Simon Fraser University):
“Similarities in channel form and function between rivers, glaciers, debris flows and other channelized flows”
Jean Braun (GFZ Potsdam, University of Potsdam):
“What Controls Alluvial Fan Size and Shape?”

Durra Handri Saputera
2024-03-20 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Modelling and inversion of electromagnetic induction log using the Integral Equation method
Durra Handri Saputera
Electromagnetic (EM) induction logging tools are commonly used to assist the optimal trajectory decision process while drilling. The tool typically has multiple axial components with different sensitivities to the subsurface structure and anisotropy. Three-dimensional (3D) inversion of induction logs enables imaging of complex geological formations. However, it is still very challenging because of the significant computational cost of the 3D forward modelling. This motivates the study of inexpensive approaches to the forward and inverse problems. In this talk, I will give an overview of the things we have developed based on the implementation of the Integral Equation method on the forward and inverse problems.”

Agustin Argüello Scotti
2024-04-03 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Baffled by Baffles: Modelling and Evaluating the Effects of Internal Heterogeneity in Wave-dominated, Shallow-marine Reservoirs
Agustin Argüello Scotti
Shallow marine successions make for excellent oil and gas reservoirs worldwide and are particularly important as carbon capture and storage targets. Although usually very noble reservoirs, their internal heterogeneities can have a significant impact on fluid flow under certain conditions. Even so, there are not many available efficient methods to model such heterogeneities. The general aim of this talk is to show how baffles or barriers in shallow-marine wave-dominated reservoirs can be modelled by the GEOPARD algorithm, allowing for the evaluation of their effects on fluid flow using the Eclipse 100 simulator. This is achieved by (i) modeling an outcropping shallow marine succession with Truncated Gaussian Simulation and GEOPARD, showing the differences between the traditional and the newly developed method, (ii) showing how to set up an experimental design in ECLIPSE, designed to evaluate the effect of geological heterogeneity in fluid flow and (iii) comparing the impact of modelling and not modelling heterogeneities; helping us realize if it’s worthwhile to be ‘baffled by baffles’.

EGU practice talks
2024-04-10 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
EGU practice talks
Leonardo Muniz Pichel – The role of post-salt carbonates on salt tectonic minibasin formation.
Gang Lu – On the causes of melt focusing at mid-ocean ridges: Ridge suction versus permeability barrier

Masters Slot
2024-04-17 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Masters Slot
More details soon…

Helene Stemland
2024-04-24 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Fieldwork in Svalbard for students
Helene Stemland
This seminar highlights the opportunities and challenges of involving students in geophysical data acquisition, drawing from years of experimentation. It explores how field data collected during courses contribute to ongoing research. The presentation includes captivating videos created by students to illustrate their experiences and contributions to the field.

Albina Gilmullina
2024-05-15 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Albina Gilmullina
More details soon…

Tim Cullen
2024-05-22 00:15 - 13:00
Tim Cullen
More details soon…

Marianna Anichini
2024-05-29 00:15 - 13:00
Marianna Anichini
Seismic-to-acoustic coupling in the Arctic Ocean: What the Gakkel Ridge can reveal

Eliane Petersohn
2024-06-05 00:15 - 13:00
Investigating Naturally Fractured Reservoirs in the Brazilian Pre-Salt Play
Eliane Petersohn
Eliane is an experienced geologist working for ANP (Agência Nacional do Petróleo, equivalent to the Norwegian Offshore Directorate) in Brazil for more than 15 years, currently on leave to do a Fulbright-funded PhD project at Stanford. There, she is working on the relationship between deformation structures (fractures, mostly) and fluid flow in the subset carbonate reservoirs offshore Brazil, employing a wealth of well and seismic data available through ANP.
Abstract:
Natural fracture networks significantly enhance reservoir permeability, facilitating fluid flow and optimizing production rates within carbonate reservoirs. However, these networks also introduce heterogeneity, creating complex flow pathways that can be challenging to characterize and quantify. Similarly, fault systems act as conduits or barriers to fluid flow, contributing to reservoir heterogeneity and potentially inducing fracturing. Understanding the interplay between these features is crucial for effective reservoir management. The Brazilian Pre-salt Province, characterized by naturally fractured carbonate reservoirs with exceptionally high production rates, exemplifies this challenge. While the high productivity is likely linked to interconnected fracture and fault systems, their complex nature and limitations in observation scale make characterization challenging. My research aims to unravel this complexity by investigating the relationship between fracture networks, fault systems, and their influence on reservoir property distribution. To achieve this, I propose an integrated approach encompassing 3D seismic interpretation, geomechanical modeling, and analysis of seismic and sonic anisotropy. Preliminary results from a strategically selected well in the Atapu field reveal valuable insights into fracture characteristics, including a consistent WSW-ENE strike orientation. However, a clear correlation between highly fractured intervals and permeability, porosity, or silica content was not observed. Notably, fractures do correlate with vuggy porosity estimated from the acoustic borehole image (BHI). Additionally, a fracture index, developed using random forest regression on well log responses and BHI-interpreted fracture intensity, demonstrates promising results in predicting fractured intervals.

Umut Isikalp
2024-06-12 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
4D Evolution of a Salt Wall and Implication for Flanking Minibasin Stratigraphy: An Example from the Egersund Basin, Norwegian North Sea
Umut Isikalp
Salt diapirs are the most common type of salt-tectonic structure, occurring in many, if not all, salt basins. Two main types of diapiric structures are typically developed: salt walls, which are defined by axial ratios >2, and salt stocks, which have axial ratios <2. Diapirs form in response to a range of geological processes, including contraction, extension, differential loading, and buoyancy instabilities. Differential loading is often associated with the formation of minibasins, which subside and subsequently drive salt into adjacent diapirs. Although we have a good general understanding of the growth of diapirs, our knowledge of their four-dimensional evolution and the temporal and spatial relationships between walls and stocks is relatively limited.
In this study, we examine Triassic stratal geometries around a 23 km long, 2.5 km wide and 3100 ms (TWT) tall salt wall in the Egersund Basin, offshore Norway. In particular, we explore how stratal geometries develop in 4-D and how they are influenced by evolving salt structure and other controls in a continental depositional environment. The Egersund Basin and the salt wall we have chosen are an ideal study location, given it contains seismically well-imaged salt structures and adjacent minibasins. Well 17-12-1R penetrates the entire thickness of the Triassic minibasin succession, allowing us to construct a robust, age-constrained seismic-stratigraphic framework, and to analyse diapir kinematics in 4-D.
We identify and map six Triassic sequences and undertake schematic restorations of Triassic stratal geometries on both wall-perpendicular and wall-parallel (through axes of flanking minibasins) seismic sections. Analysis of thickness patterns and salt-sediment relationships on wall-perpendicular sections suggests the initial trigger for salt mobilization into the wall was sediment loading. This loading led to the formation of a pillow, which, during the early Carnian period, evolved diachronously into a wall due to the varying timing of erosion of the overburden and active diapirism. Thickness patterns, stratal upturns, the style, and distribution of angular unconformities between seismic sequences, and variations in axial fold traces suggest the driving force of wall growth from the mid-Carnian to the end of the Triassic was passive diapirism (i.e., sediment loading), which was associated with minibasin downbuilding. Wall-parallel seismic sections within the axes of flanking minibasins indicate that superimposed on this general growth pattern was the formation of along-strike turtle structures, pointing the growth of salt welds during both the Carnian and Norian periods, related to complex, four-dimensional salt flow into nearby diapirs.
The complex spatio-temporal variations in subsidence, stratal upturns, angular unconformities, thickening, and thinning patterns around the salt wall over time, driven by salt flow and diapir evolution, have significant implications for the geometry and distribution of potential reservoirs, relevant for both carbon capture and storage as well as traditional oil and gas exploration.

Prof Delphine Rouby
2024-09-05 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Source-To-Sink Sedimentary Budget of the African Equatorial Atlantic Rifted Margin
Prof Delphine Rouby
Despite their very low relief and erosion rates, non-orogenic (i.e., cratonic) continental domains account for over 60% of the Earth’s exposed lands. Therefore, they contribute significantly to the clastic sediments and solutes exported to the ocean and should be accounted for in global studies. Nonetheless, they have been much less studied than orogenic domains. In this study, we establish the source-to-sink sedimentary budget of the sub-saharan West African cratonic domain and its Equatorial Atlantic rifted margin using published low-temperature thermochronological data to estimate onshore denudation and regional geological cross-sections to estimate offshore accumulation. We show that during and immediately following rifting (130-94 Ma), the build-up and subsequent erosion of rift-related relief resulted in a transient, 100–200 km wide strip along the margin recording high denudation rates (>50 m/Myr), while the inland domain underwent steady and very low denudation (<10 m/Myr). Afterward, the whole onshore domain underwent very low and steady denudation. Thus, the changes in post-rift accumulation rates documented along the rifted margin were caused by changes in the climate and/or drainage network. During the Late Cretaceous, we document a regional rise in accumulation rates caused by the enlargement of drainage areas feeding the basins by a hinterlandward migration of the continental divide. During the Paleogene, we document a general drop in accumulation rates in all the basins of the African Atlantic margins caused by the global greenhouse climate, which enhanced the development of lateritic weathering mantles, storing clastic sediments on the continent and favoring solute exports to the ocean.

Salt Tectonics for the energy transition
2024-09-18 12:00 - 13:30 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Salt Tectonics for the energy transition
Practice talks for the conference Unlocking the Potential of Salt Tectonics in the Energy Transition
Manel Ramos
Architecture and controlling factors of intra-salt layers in diapiric structures: A numerical modelling approach
Understanding the structure of intra-salt layers within deformed salt bodies is crucial for effective CO2 and H2 storage in salt basins. This study employs high-resolution 2D finite element modelling to investigate how variations in salt stratigraphy and lithological variability and post-salt sedimentation patterns influence the deformation processes and the internal architecture of diapiric salt structures for different basin geometries. We test intra-salt lithological variability by varying the vertical arrangement, viscosity and density of salt layers as well as including non-viscous (frictional-plastic) layers simulating carbonates and/or siliciclastics embedded within the layered salt sequence. The models with alternated low (1018) and high (1019 Pa×s) viscosity salt layers show significant internal salt flow partition characterized by preferential flow of the weak salt layers into the core of diapirs, as the stronger layers remain at their flanks and/or underneath adjacent minibasins. The order of the strong and weak salt layers also has a significant impact on the overall external and internal style of salt deformation, with both the basal and top layer being the most significant. Increasing the density of strong salt layers produce even greater internal salt flow partition with pronounced intra-diapir complexity, convolute folding, repetition of intra-salt stratigraphy within diapirs and occasionally boudinage. Stronger and denser layers tend to get trapped at the base of diapirs and/or underneath diapirs while being folded and refolded by flow of the intervening weaker and less-dense layers. The basin geometry and the presence of base-salt relief also have a significant influence on the basin-scale style and magnitude of salt deformation. The results can help elucidate the basin-scale controls exerted on both internal and external diapir geometries for rift basins, which are directly applicable for various areas of the North Sea, a key location for utilization of salt structures for geo-storage.
Leonardo Pichel
The role of intra-salt stratigraphy and lithological variability on the internal and external geometry of salt bodies – a numerical modelling approach
Umut Isikalp
Harya Nugraha
PDF of the conference

Anna Karin Døsen (MSc)
2024-09-25 12:00 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Salt tectonics: Sivas Basin (Turkey)
Anna Karin Døsen

Robert Reinecke
2024-09-26 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
How to use an impossible map – uncertainties in modeling the global water cycle
Robert Reinecke (Guest at the Department invited by Elco Luijendijk)
Global water models allow us to explore the terrestrial water cycle in an earth-sized digital laboratory to guide science and policy. These models simulate increasingly complex representations of different compartments, such as groundwater, and complex processes, such as seawater intrusion. They are coupled with other models, bringing us closer to a digital twin of Earth and enabling us to carry out complex impact assessments of the far future. At the same time, bias-corrected seasonal forecasts allow us to use these models as a window into the near future. However, global water models remain highly uncertain and evaluating them remains challenging. Multiple pathways can be taken to reduce these uncertainties by collecting available knowledge in new ways and analyzing this data with new approaches. In this talk, I will outline new strategies for assessing these complex models differently and rigorously and develop more sustainable research software for a robust science.

Océane Foix
2024-10-02 00:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
From local travel time tomography to seismotectonic models.
Océane Foix, ISTerre, UGA, Grenoble, France
From the creation of seismic databases to seismic travel time tomography and seismic hazard, my aim is to present my career as a young researcher over the last 5 years. I have been able to study different tectonic systems and contexts, such as the deformation of the Vanuatu central subduction forearc (tomography), the seismo-volcanic crisis of Mayotte (tomography) and finally the seismic hazard of the Lesser Antilles subduction (seismotectonic model). At present, I’m using my knowledge to assess the effect of mantle wedge seismicity in the Lesser Antilles on seismic hazard calculations.

Lucie Alain and Agustin Scotti
2024-10-16 00:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Field stories from Eastern Greenland

Presenters Lucie Alain, Agustin Scotti
The DeepReservoir project aims to investigate the distribution and geometry of chlorite-coated intervals in the Early Jurassic Tilje Formation and its analogue in Eastern Greenland. This summer the DeepReservoir team had the chance to go to Jameson Land in eastern Greenland to collect data for the project. Come along to get a chance to see the amazing landscape of Liverpool Land and to hear about what animal were worst than polar bears.

Marianna Anichini
2024-10-30 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Marianna Anichini
Reaching the end of the world and back. Stories from the HiAOOS expedition in the high Arctic
Being at sea has always been my dream. Sailing in a sea covered by ice has been an experience that went beyond my expectations. Explorations of this kind are rare and can represent a milestone from personal and scientific perspectives. With some pictures, I will tell you the story of this expedition, how we can study seismic events in such remote places and try to describe emotions that fuel the passion for the work we do.

Maren Kjos Karlsen
2024-11-06 00:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
A NEW NATIONAL SEISMIC HAZARD ASSESSMENT FOR NORWAY
Maren Kjos Karlsen
Do we have earthquakes and do we need to care? An overview of present and past earthquakes and related shaking, our aims to forecast future activity and shaking, and what our preliminary results are telling us.

Isabelle Lecomte
2024-11-13 12:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
Ground-Penetrating Radar: fun with rapid underground imaging!
Isabelle Lecomte
Ground-Penetrating Radar (GPR) is probably the most popular geophysical tool for shallow-underground imaging. Its range of application is wide and movies even portray it, e.g., in crime- (forensics) or archaeology-related films. Though using EM-waves instead of elastic ones, GPR’s acquisition principles and processing/imaging have much similarities with seismic. But EM-waves are extremely fast and getting images with GPR is thus a dream compared to seismic! This gives us a tool which is very handy for geophysical education in wave methods and signal processing, while being applicable to various ground-imaging issues as will be illustrated.

Mathilde Bøttger Sørensen
2024-11-20 00:15 - 13:00
EPOS-Norway – Research Infrastructure for Geohazards (EPOS-NG)
Mathilde Bøttger Sørensen
The EPOS-Norway – Research Infrastructure for Geohazards (EPOS-NG) will be established, starting from early 2025, with funding from the Research Council of Norway’s Infrastructure program. EPOS-NG aims to be the go-to infrastructure for research on geohazards in Norway (i.e., landslides, tsunamis, earthquakes, and cryospheric hazards). Complementary to EPOS ERIC and building on research infrastructure developed during EPOS-Norway (EPOS-N) phase 1, EPOS-NG will establish new pools of instruments that are easily accessible to all geoscientists in Norway. We will develop an enhanced and extended state-of-the-art data portal to provide nationwide access to a range of geoscience data as well as computational and visualisation services. The EPOS-NG instrument pools include rapid-deployable seismometers, ocean bottom seismographs, Distributed Acoustic Sensing and Distributed Temperature and Strain Sensing instrumentation, Transient Electromagnetic measurement capacity, piezometers, self-potential sensors and ground-based interferometric radar systems. The new instruments will facilitate research on a wide range of processes including seismicity, slope stability and landslides, groundwater and soil conditions, permafrost and cryospheric processes. Combined with new services for tsunami hazard assessment, as well as novel datasets on InSAR displacement trends and historical and palaeoseismological events, new links can be established through comprehensive, multidisciplinary studies. Effective data integration and visualisation will be achieved via the EPOS-N portal, which was developed in EPOS-N phase 1 and will be substantially enhanced in close dialogue with the users in EPOS-NG. The portal combines data from distributed monitoring networks, innovative services for advanced data analysis and national databases within geosciences into a single national e-infrastructure, following FAIR principles. EPOS-NG thus represents a unifying nationwide research infrastructure, including all the relevant physical infrastructures and providing a national hub for solid Earth science data and services. In this presentation, I will present the plans for EPOS-NG and describe how the community can be involved in and benefit from the activities.

Sebastian Wolf
2024-12-04 00:15 - 13:00 | Kontinentalsokkelen (2G16e), Realfagbygget, Allégaten 41, Bergen, 5007, Norway
How to invert extensional basins – modelling the influence of pre-collisional extension on 3D mountain belt architecture
Sebastian Wolf
The geological record shows that many orogens, like the Andes, Pyrenees, Atlas, and Greater Caucasus form to a large degree by inversion of pre-collisional extensional basins that are typically offset and show different degrees of basin linkage. However, the 3D dynamics of inverting offset extensional basins and their importance for mountain building remain poorly understood. To bridge that knowledge gap, we use 3D state-of-the-art geodynamic models coupled to a fluvial surface processes model to investigate the dynamics of extensional-basin inversion during continent-continent collision. We find that a) basins link during the extensional stage if basin off-set is not too large; b) inversion of off-set rift basins naturally tends to create opposite polarity subduction, which reverts the plan-view structure of the mountain belt; c) same-polarity subduction requires further weaknesses, but preserves the structure of the extensional basins in the mountain belt. The distribution and orientation of topography and fluvial valleys tracks the deep-structure and can be used as indicators. Based on these model characteristcs and backed by a force-balance analysis, we compare the model results to the Pyrenees, Atlas, and Greater Caucasus.
