Alex Hobé

Alex Hobé
Uppsala University | UU · Department of Earth Sciences

MSc. Earth Science ETH, Major in Geophysics

About

16
Publications
2,568
Reads
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24
Citations
Citations since 2017
16 Research Items
24 Citations
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20172018201920202021202220230246810

Publications

Publications (16)
Article
Full-text available
Geothermal exploration targets large magmatic intrusions as heat sources because of their size, longevity, and amount of stored energy, but as shallow volcanic plumbing systems comprise numerous smaller intrusions, their geothermal potential warrants consideration. Here, we evaluate the geothermal impact of dykes and sills on caldera-infill rocks....
Preprint
Full-text available
Because geophysical inversion is used in many vital societal applications, it is unfortunate that some aspects of inverse methods are so abstract. The difficulty of identifying fundamental behaviors is exacerbated when investigating large non-linear problems which combine multiple datasets into a single model, or which produce multiple models with...
Conference Paper
Full-text available
Geothermal exploration targets large magmatic intrusions as heat sources because of their size, longevity, and amount of stored energy, but as shallow volcanic plumbing systems comprise numerous smaller intrusions, their geothermal potential warrants consideration. Here, we evaluate the geothermal impact of dykes and sills on caldera-infill rocks....
Conference Paper
Full-text available
Geothermal exploration usually targets large magmatic intrusions as heat sources due to their longevity, size, and thus amount of stored energy. However, such large intrusions are usually located at several kilometres depth in active volcanic areas, while networks of numerous small intrusions (sills and dykes) are frequent even at shallower depths....
Conference Paper
Full-text available
The volcanic eruption that began on 19 March 2021 at Fagradalsfjall is the first one to occur on the Reykjanes Peninsular for nearly 800 years and in Fagradalsfjall for about 6000 years. The feeder-dike was injected from a magma reservoir whose top is at about 10 km depth below the surface (but the reservoir itself reaches much greater depths). The...
Conference Paper
Full-text available
Although many deep-seated magma reservoirs have been detected beneath active volcanic systems in Iceland in recent decades, none were detected beneath the 5 volcanic systems on the Reykjanes Peninsula (RP) before the year 2020. This area, close to Iceland’s capital Reykjavik, was subject to an unrest period with numerous earthquakes, beginning in D...
Conference Paper
Full-text available
Near Reykjavik, the capital of Iceland, lies the Krysuvik high-temperature geothermal area, which could potentially provide vast amounts of energy to this and surrounding towns and villages. Possible changes to the heat-source and/or hydrothermal system in this area are indicated by a period of surface deformation between 2007 and 2016 (Gudjonsdott...
Conference Paper
Full-text available
The Reykjanes Peninsula, Iceland, could soon see a once-in-a-millennium eruption, based on its current unrest and its historical record. This period of volcano-tectonic events threatens nearby airfields, geothermal power plants, and the capital, Reykjavik, where two thirds of Iceland’s population reside. The main sources of risk are lava, volcanic...
Presentation
The benefits of time-varying processes for interpreting geophysical inverse models.
Conference Paper
Full-text available
The benefits of time-varying processes for interpreting geophysical inverse models.
Presentation
A community exercise to bring together members of the Software Underground (SWUNG) and the wider geothermal community. After providing an overview of the many aspects of the geothermal puzzle, we will join forces to rank order methods, ideas and issues that have contributed to the success (or lack thereof) of geothermal projects in the past. The sa...
Conference Paper
Full-text available
Permeability results from laboratory experiments are commonly included in numerical models of geothermal systems using a conversion to depth. This conversion is shown alongside the usual assumptions and underlying physical mechanisms. The limitations of these assumptions lead us to suggest an alternative to depth conversion. Lastly, we compare the...
Conference Paper
On January 22, 2020, inflation of 3-4 mm per day started in the volcanic system of Svartsengi, within 5 km of several important infrastructure: a) the town of Grindavík (pop. 3300); b) the Svartsengi geothermal power plant, 75MWe, 150 MWth; c) and the Blue Lagoon geothermal spa, which has over 1 million annual visits. Grindavík is one of two towns...
Article
To enable fast uncertainty quantification of fluid flow in a discrete fracture network (DFN), we present two approaches to quickly compute fluid flow in DFNs using combinatorial optimization algorithms. Specifically, the presented Hanan Shortest Path Maxflow (HSPM) and Intersection Shortest Path Maxflow (ISPM) methods translate DFN geometries and p...
Preprint
Full-text available
To enable fast uncertainty quantification of fluid flow in a discrete fracture network (DFN), we present two approaches to quickly compute fluid flow in DFNs using combinatorial optimization algorithms. Specifically, the presented Hanan Shortest Path Maxflow (HSPM) and Intersection Shortest Path Maxflow (ISPM) methods translate DFN geometries and p...

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Projects

Projects (2)
Project
The word Upstream is more commonly used in oil and gas industry. This mainly means operations at the wellsite. These days this operations are being use for Geothermal, Salt production, gas storage, underground water, gas hydrates and continental or oceanic scientific drilling.
Project
Investigating the effect of different types of anisotropy and heterogeneity in Lithosphere by Numerical and Experimental means.