Christopher Juhlin

Christopher Juhlin
Uppsala University | UU · Department of Earth Sciences

PhD Geophysics

About

419
Publications
82,451
Reads
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6,308
Citations
Citations since 2016
111 Research Items
2807 Citations
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20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
Introduction
BA in Geology from Brown University (USA) in 1978, MSc in Oceanography from the U. of Washington, (Seattle, WA, USA) in 1983, PhD in Geophysics from Uppsala University (Sweden) in 1990. Research interests include crustal geophysics, high resolution seismics, seismic modeling, mining geophysics, geological storage of CO2, and scientific drilling. Member of Royal Swedish Academy of Sciences (kva.se), adjunct professor at Curtin University, Australia and guest professor at Jilin University, China.
Additional affiliations
January 1984 - present
Uppsala University
Position
  • Professor (Full)

Publications

Publications (419)
Article
Full-text available
We present five interpreted regional seismic profiles, describing the full sedimentary sequence across the Swedish sector of the Baltic Sea. The data for the study are part of an extensive and largely unpublished 2D seismic dataset acquired between 1970 and 1990 by the Swedish Oil Prospecting Company (OPAB). The Baltic Basin is an intracratonic bas...
Article
Full-text available
The Collisional Orogeny in the Scandinavian Caledonides (COSC) project, a contribution to the International Continental Scientific Drilling Program (ICDP), aims to provide a deeper understanding of mountain belt dynamics. Scientific investigations include a range of topics, from subduction-related tectonics to the present-day hydrological cycle. CO...
Article
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Enhanced geothermal systems (EGS) are a potential heat source in many parts of the world, even in locations where the temperature gradient is relatively low. We present here an integrated study of reflection seismic data, borehole logs and seismicity analysis performed in conjunction with a geothermal exploratory project operated by E.ON in Malmö,...
Article
New seismic profiles located within the Bornholm Gat in the SW Baltic Sea area image Late Cretaceous-Paleogene inversion and exhumation of a previously poorly characterized narrow crustal zone in the southern end of the Sorgenfrei–Tornquist Zone (STZ), a long pre-Alpine tectonic lineament in Europe. Thrusts and pop-up structures developed along the...
Article
Full-text available
An approximately 40-km long high-resolution reflection seismic profile (P3) was acquired in the metropolitan area of Seoul in South Korea for the purpose of fault system imaging in a highly noisy and challenging urban environment. Two 12t seismic vibrators (mini-vibs) were used as the seismic source. Data were recorded using a dual element seismic...
Article
We advance a previously established method for 2D inversion of electromagnetic (EM) data, in which smoothness constraints are locally re-weighted according to the seismic envelope fractional gradients (SEFG). As the first step of our modifications, seismic envelope values are edited and normalized. This results in rejection of noise-contaminated pa...
Article
Ketzin is a well-known onshore CO2 geological storage test site. Injection started in June 2008 and ended in August 2013. About 67 kt of CO2 was injected into a saline aquifer reservoir. Numerous geophysical surveys have been conducted at the site, including passive seismic ones. Passive seismic interferometry can be applied in many seismic explora...
Article
Full-text available
Passive reflection seismic interferometry (PRSI) facilitates imaging the subsurface structure using passive sources but according to the general theory, the target needs to be illuminated equally from all directions to obtain a kinematically correct result. In practice, this requirement is almost impossible to meet which can introduce artefacts int...
Preprint
Full-text available
This study presents K-Ar geochronology ages of illite from fault gouge in the crystalline basement in central-western Sweden. Samples of fault gouge were taken from two faults localizing brittle deformation along and within mafic dikes that intrude Paleoproterozoic granites. K-Ar ages from the ten dated fractions span from 823 Ma to 392 Ma. The old...
Article
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The Fennoscandian Shield in central Sweden displays a complex structural and compositional architecture that is mainly related to the Proterozoic history of the Baltica paleocontinent. In its western parts, the Precambrian basement is covered by the allochthonous rocks of the Caledonide orogen, and direct information about the underlying crust is r...
Chapter
Geophysical monitoring activities were an important component of the CO2 injection program at the Ketzin site, Germany. We report on the seismic measurements and electrical resistivity tomography (ERT) performed during the period of site development and CO2 injection. Details on the geology, CO2 injection operation, and petrophysical models relevan...
Article
Full-text available
The Collisional Orogeny in the Scandinavian Caledonides (COSC) scientific drilling project aims to characterise the structure and orogenic processes involved in a major collisional mountain belt by multidisciplinary geoscientific research. Located in western central Sweden, the project has drilled two fully cored deep boreholes into the bedrock of...
Article
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Multi-component high resolution seismic reflection data were acquired at the Uppsala University field test site in Marsta, Sweden, in March 2019 with the aim of obtaining an improved understanding of the subsurface structure in the area. An advantage of the site is that a number of boreholes have been drilled there for both hydrogeological and geop...
Article
Full-text available
Seismic imaging while drilling (SWD) technology offers possibilities of imaging ahead of the drill-bit, which could be useful for determining when to go from hammer drilling to core drilling. Also, seismic images of the surrounding rock can improve geological models which could be then used to guide drilling programs. An SWD field test was carried...
Chapter
Glacially triggered faulting describes movement of pre-existing faults caused by a combination of tectonic and glacially induced isostatic stresses. The most impressive fault-scarps are found in northern Europe, assumed to be reactivated at the end of the deglaciation. This view has been challenged as new faults have been discovered globally with a...
Article
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To characterize the coupled hydromechanical behavior of rock fractures, the step‐rate injection method for fracture in‐situ properties (SIMFIP) was conducted with a specialized downhole probe developed by Guglielmi et al. (2014, https://doi.org/10.1007/s00603-013-0517-1). In June 2019, a field campaign was carried out near Åre, Sweden, where the SI...
Article
Full-text available
Traditional earthquake location relying on first arrival picking is challenging for microseismic events with low signal-to-noise ratio. Over the past years, alternative procedures have been explored based on the idea of migrating the energy of an earthquake back into its source position by stacking along theoretical traveltime curves. To avoid dest...
Article
The Collisional Orogeny in the Scandinavian Caledonides (COSC) scientific drilling project focuses on mountain building processes in a major mid-Paleozoic orogen in western Scandinavia and its comparison with modern analogues. The transport and emplacement of subduction-related highgrade continent-ocean transition (COT) complexes onto the Baltoscan...
Article
Full-text available
The European Geosciences Union (EGU) is one of the leading global bottom-up societies that promotes earth, planetary and space sciences. In its annual general assemblies, EGU brings together experts from all over the world to discuss cutting-edge research and implementation of findings in its respective disciplines and thus offers a unique forum fo...
Conference Paper
A. Hammar (E.ON), M. Egard (E.ON), M. Erlström (Geological Survey of Sweden), C. Juhlin (Uppsala University), P. Heikkinen (St1), P. Malin (ASIR) ABSTRACT In the late 1990s, the Malmo power company Sydkraft contracted a vibroseis reflection survey of the city's harbor area. The aim was to establish the thickness and structure of the underlying sedi...
Article
Accurate picking of head-wave arrival times is an important component of first-arrival traveltime tomography. Far-offset traces in particular have low signal-to-noise ratio (SNR), but picking on these traces is necessary in order to obtain velocity information at depth. Furthermore, there is often an insufficient number of far-offset traces for obt...
Conference Paper
Full-text available
The role of inheritance in localizing basement deformation in the foreland has been demonstrated in orogens in different parts of the world. In the external domain of the central Scandinavian Caledonides, questions remain about the amount and the distribution of deformation accommodated by the Baltica basement during Caledonian orogeny. However, to...
Article
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Borehole heat exchangers, especially deep ones, are usually drilled through different geological layers having varying properties. Homogeneous and layered models can be used for borehole performance predictions. The homogeneous model considers all layers as a single layer having effective properties while the layered model considers all layers sepa...
Article
Full-text available
To evaluate and upscale the feasibility of utilizing exploration tunnels in an operating mine for active-source seismic imaging, a seismic experiment was conducted at the Neves-Corvo mine, in southern Portugal. Four seismic profiles were deployed in exploration drifts ca. 650 m beneath the ground surface, above the world-class Lombador volcanogenic...
Article
Full-text available
Since 2004, the European Geosciences Union (EGU) brings together experts from all over the world into one annual event covering all disciplines of the Earth, planetary and space sciences. This special issue in Advances in Geosciences comprises a collection of contributions from the Division on Energy, Resources and the Environment (ERE) which were...
Article
Full-text available
Reprocessing of high resolution seismic reflection data over groundwater‐bearing glacial deposits near Heby, southeastern Sweden, improved the images of near surface structure at this site. Post‐stack time migration (PSTM) and pre‐stack depth migration (PSDM) were tested and compared to determine the improvement on imaging an undulating bedrock sur...
Article
Full-text available
Every year, the European Geosciences Union (EGU) brings together experts from all over the world at its General Assembly, covering all disciplines of the Earth, planetary and space sciences. The EGU Division on Energy, Resources and the Environment (ERE) is concerned with one of the humankind's most challenging goals – providing affordable, reliabl...
Chapter
This chapter provides a review of the life-cycle operations at the Ketzin pilot site for CO2 storage. The injection phase at the Ketzin site lasted from 2008 to 2013 and a comprehensive geophysical monitoring program was applied, including seismic and geoelectric surface and surface-downhole measurements, as well as crosshole tomographic investigat...
Conference Paper
Full-text available
Innovative Exploration Drilling and Data Acquisition (I-EDDA) was a Network of Infrastructure in the European Institute of Innovation & Technology (EIT) Knowledge and Innovation Community (KIC) "Raw Materials", running from 2016 to 2018. Its purpose was to unite partners from academia and industry to jointly address challenges that are expected to...
Conference Paper
Full-text available
We re-process high-resolution shallow seismic reflection data collected over glacial deposits in Heby, Southeastern Sweden, to accurately map the dipping bedrock topographies and enhance the quality of the seismic images of groundwater bearing structures. We apply Kirchhoff pre-stack depth migration (PSDM) on the pre-stack processed data and compar...
Article
Full-text available
Since 2004, the European Geosciences Union (EGU) brings together experts from all over the world at its annual General Assembly, covering all disciplines of the earth, planetary and space sciences. With this special issue in Advances in Geosciences, we are pleased to present a collection of contributions from the Division on Energy, Resources and t...
Article
Full-text available
Saucer-shaped intrusions of tens of meters to tens of kilometres across have been observed both from surface geological mapping and geophysical observations. However, there is only one location where they have been reported to extend c. 100 km laterally, and emplaced both in a sedimentary basin and the crystalline basement down to 12 km depth. The...
Article
A remarkably well preserved representation of a deeply eroded Palaeozoic orogen is found in the Scandinavian Caledonides, formed by the collision of the two palaeocontinents Baltica and Laurentia. Today, after four hundred million years of erosion along with uplift and extension during the opening of the North Atlantic Ocean, the geological structu...
Article
Full-text available
Understanding the development of post-glacial faults and their associated seismic activity is crucial for risk assessment in Scandinavia. However, imaging these features and their geological environment is complicated due to special challenges of their hardrock setting, such as weak impedance contrasts, often high noise levels and crooked acquisiti...
Article
New broadband magnetotelluric (MT) data have been acquired along two parallel profiles in the central part of the metallogenic Skellefte district in northern Sweden. The data were recorded as part of the Swedish 4D modelling of mineral belts project and cover an area with several economical and sub-economical deposits. The dimensionality and qualit...
Book
Full-text available
Cambridge Core - Climatology and Climate Change - Geophysics and Geosequestration - edited by Thomas L. Davis
Article
Exhumation of crust exposes rocks to weathering agents that weaken the rocks’ mechanical strength. Weakened rocks will have lower seismic velocity than intact rocks and can therefore be mapped using seismic methods. However, if the rocks are heavily weathered, they will attenuate controlled-source seismic waves to such a degree that the recorded wa...
Article
Full-text available
Wind energy is an important field of development for the island of Gotland, Sweden, especially since the island has set targets to generate 100% of its energy from renewable sources by 2025. Due to the variability of wind conditions, energy storage will be an important technology to facilitate the continued development of wind energy on Gotland and...
Article
Full-text available
Wind energy is an important field of development for the island of Gotland, Sweden, especially since the island has set targets to generate 100% of its energy from renewable sources by 2025. Due to the variability of wind conditions, energy storage will be an important technology to facilitate the continued development of wind energy on Gotland and...
Article
The Swedish island of Gotland is located within the Baltic Basin. During the Late Ordovician the region around Gotland was part of a shallow epicratonic basin in the southern subtropics. In these warm-water environments algae flourished, diverse reefs developed close to the coastline and further outboard carbonate mounds developed. These mounds for...
Article
Full-text available
Understanding the development of post-glacial faults and their associated seismic activity is crucial for risk assessment in Scandinavia. However, imaging these features and their geological environment is complicated due to special challenges of their hardrock setting, such as weak impedance contrasts, sometimes high noise levels and crooked acqui...
Conference Paper
Full-text available
ERT IMAGING OF SUBSURFACE STRUCTURE OF A SINKHOLE IN GREENE COUNTY, MISSOURI Shishay Kidanu, Missouri S&T; Evgeniy Torgashov, Missouri S&T; Neil Anderson, Missouri S&T Thousands of sinkholes have been identified in the state of Missouri; Greene County, in particular, is one of the counties in the state most known for the occurrence of sinkholes....
Conference Paper
Full-text available
The global demand for mineral resources is increasing every year, with now even a strong push for green and high-tech technologies. Considering the ever-increasing hope of exploring these resources at depth, particularly at near mines or near existing infrastructures, new and improved approaches for integrating available data and use them to optimi...
Article
Full-text available
Every year, the European Geosciences Union (EGU) brings together experts from all over the world at its General Assembly, covering all disciplines of the Earth, planetary and space sciences. The EGU Division on Energy, Resources and the Environment (ERE) is concerned with one of the humankind's most challenging goals – providing affordable, reliabl...
Article
The injection of CO2 at the Ketzin pilot site commenced in June 2008 and was terminated in August 2013 after 67 kT had been injected into a saline formation at a depth of 630–650 m. As part of the site monitoring program, four 3D surface seismic surveys have been acquired to date, one baseline and three repeats, of which two were conducted during t...
Conference Paper
Full-text available
Interlobate esker cores of the Virttaankangas area in southwestern Finland constitute a major aquifer to store water for the nearby city. Thus it is essential to image the substructure of the aquifer layers accurately and with good resolution so that underground pathways and storage capacity can be identified. Theoretically, S-waves have a higher r...
Article
Full-text available
Estimation of the reservoir physical parameters in hydrocarbon zones is important for seismic exploration. Frequency analysis has proven to provide useful information on the velocity dispersion and attenuation of seismic wave-fields propagating through porous media. In this study we have carried out a velocity and reflectivity dispersion analysis u...
Conference Paper
Full-text available
The Scandinavian Caledonides represent a well preserved deeply eroded Palaeozoic orogen, formed by the collision of the two palaeocontinents Baltica and Laurentia. Today, after four hundred million years of erosion along with uplift and extension during the opening of the North Atlantic Ocean, the geological structure in central western Sweden cons...
Article
In towed marine seismic data acquisition, a gap between the source and the nearest recording channel is typical. Therefore, extrapolation of the missing near-offset traces is often required to avoid unwanted effects in subsequent data processing steps. However, most existing interpolation methods perform poorly when extrapolating traces. Interferom...