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Disputas: Annie Elisabeth Jerkins

Ph.d.-kandidat Annie Elisabeth Jerkins ved Institutt for geofag, Det matematisk-naturvitenskapelige fakultet, vil forsvare avhandlingen Improved Understanding of Seismicity in the North Sea for graden Philosophiae Doctor.

Annie Elisabeth Jerkins. Foto: Privat

Annie Elisabeth Jerkins. Foto: Privat

Disputas og prøveforelesning er i Auditorium 1 i Geologibygningen. I noen tilfeller vil prøveforelesning og disputas være mulig å delta på digitalt, i så fall blir det lagt ut en lenke til Zoom.

Prøveforelesning

Onsdag 8 mai, 10:15-11:00, Aud 1, Geologibygningen:

Geothermal energy exploitation and seismicity

Kreeringssammendrag

Nordsjøbassenget utgjør et kritisk område for olje- og gassvirksomhet, og forventes å spille en viktig rolle i storskala CO2-lagring i fremtiden. I denne avhandlingen er det gjort en analyse av jordskjelvaktivitet i Nordsjøen for å forstå seismiske hendelser, for å identifisere potensiell risiko forbundet med industriell virksomhet, og for å skille mellom naturlig forekommende- og menneskeskapte jordskjelv. Avhandlingen gir videre innsikt i analytiske utfordringer, foreslår metodiske forbedringer, og forsterker vår forståelse av tektoniske prosesser i skorpen i Nordsjøbassenget.

Hovedfunn

Populærvitenskapelig artikkel om Jerkins avhandling:

Improved Understanding of Seismicity in the North Sea

The North Sea basin plays a crucial role in oil and gas exploration and has the potential to become an essential site for CO2 storage in the future. Seismic activity in the region typically ranges from low to intermediate. Nevertheless, it has experienced several notable earthquakes, including a significant event with a moment magnitude of 5.1 on 21 March 2022. Grasping the nature of these seismic events is vital for assessing the hazards and risks associated with offshore infrastructure. It also aids in differentiating between natural seismic activities and those induced by industrial operations.

Figure over seismic events within the Norwegian section of the North Sea, spanning from 23 May 2020 to 19 March 2021, Figure: Jerkins et al (2023)
Map over seismic events within the Norwegian section of the North Sea basin, from 23 May 2020 to 19 March 2021. Blue dots show earthquakes, with each dot's size reflecting the magnitude of the seismic event. Purple dots highlight offshore explosions detonated by the Norwegian Army. Black lines map out the boundaries of oil and gas fields in the area, and major fault lines are traced with white lines. Seismic monitoring stations at Oseberg, Snorre, Grane, HNAR, and NNSN are indicated by triangles in green, blue, red, orange, and white, respectively. See larger version (link). Map/figure by Jerkins et al. (2023).

This thesis tackles the limitations of the current seismic monitoring network in the North Sea and the reliance on oversimplified models, which often lead to inaccurate earthquake locations. By integrating permanent reservoir monitoring systems at oil and gas fields, such as Grane, Oseberg, and Snorre, we have significantly improved the detection and locations of seismic events. An in-depth study of the March 21, 2022 earthquake has provided deeper insights into the tectonic behaviour of the North Sea's lower crust. We also comprehensively review the area's seismic activity, addressing limitations and suggesting future improvements in seismic monitoring of the earthquake activity in the basin.

 

Foto og annen informasjon:

Pressefoto: Annie Elisabeth Jerkins, portrett; 1000px. Foto: Privat

Annet bildemateriale: Figur med beskrivelse og kreditering som spesifisert i artikkelen over, størrelse 1750px.

Publisert 23. apr. 2024 09:46 - Sist endret 23. apr. 2024 09:46