Maria Ask

Uppsala University

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Co-Authors

Thomas Scott Staerker

Florida State University

John N. Leonard

Manchester Royal Infirmary

Jean‐Yves Collot

Institut de Recherche pour le Développement

Jose Ignacio Martinez-Rodriguez

Pierrick Roperch

Université de Rennes

Terrence M. Quinn

The University of Texas at Austin

Bernard Pelletier

Institut de Recherche pour le Développement

Michael A. Hobart

Lamont-Doherty Earth Observatory

Russell C.B. Perembo

University of Papua New Guinea

Thierry Chabernaud

Schlumberger (British Virgin Islands)

Cooperative Institutions

Lund University

University of South Florida

University of Turku

University of Colorado Anschutz Medical Campus

University of Florida

Luleå University of Technology

Skåne University Hospital

Uppsala University

Helmholtz Zentrum München

Tampere University

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Overpressures and lithification state of underthrust sediments along the Nankai accretionary margin : implications for decollement evolution

Julia K. Morgan Maria Ask

Overpressures and lithification state of underthrust sediments along the Nankai accretionary margin : implications for decollement evolution

Décollement

Lithification

Margin (machine learning)

Accretionary wedge

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Citations (0)

ODP Leg 134, Hole 829A - Well Logging Data

Zenodo (CERN European Organization for Nuclear Research) (2020)

Jean‐Yves Collot H. Gary Greene Laura B. Stokking Kazumi Akimoto Maria Ask

Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, gamma radiation, velocity, density, borehole images,…) in any hole depends on the scientific objectives and operational constraints.

10.5281/zenodo.3942391

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Physical Properties of Core Samples from the Swedish Part of the Southern Baltic Sea: Implications for CO2 Storage

Energy Procedia (2016)

Ehsan Elhami Mikael Erlström Maria Ask Hans Mattsson

This paper presents the results from a series of physical measurements conducted on core samples from the Swedish part of the southern Baltic Sea. The samples consist of 16 Cambrian sandstone samples (potential reservoir rock) and 9 Ordovician limestone samples (potential caprock). The two rock types reveal contrasting properties; axial P-wave velocity and density for the sandstone samples are 3.14±0.95km/s and 2.26±0.12 gr/cm3, respectively while for the limestone samples they are 6.09±0.22km/s and 2.58±0.08 gr/cm3, respectively. The scatter of the evaluated properties indicates aleatory variability and epistemic uncertainty in the properties which can be better addressed by further tests on more samples.

Baltic sea

Caprock

Core sample

10.1016/j.egypro.2016.10.020

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European Geosciences Union General Assembly 2016 : EGU Division Energy, Resources a the Environment (ERE)

European geosciences union general assembly (2016)

Maria Ask Viktor J. Bruckman Christopher Juhlin Thomas Kempka Michael Kühn

The EGU General Assembly 2016 was held under the conference theme “Active Planet” from 16-22 April 2016 in Vienna, Austria. The program consisted of 619 unique scientific sessions and 321 side even ...

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Citations (1)

ODP Leg 134, Hole 832B - Well Logging Data

Zenodo (CERN European Organization for Nuclear Research) (2020)

Jean‐Yves Collot H. Gary Greene Laura B. Stokking Kazumi Akimoto Maria Ask

10.5281/zenodo.3942399

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Extrapolated supervirtual refraction interferometry

Geophysical Journal International (2021)

Zhuo Xu Fengjiao Zhang Christopher Juhlin Björn Lund Maria Ask

SUMMARY 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 obtaining reliable models at depth. We present here an extrapolation method for increasing the number of first arrivals beyond the maximum recorded offset, thereby extending the supervirtual refraction interferometry (SVI) method. We refer to the method as extrapolated SVI (ESVI). It is a novel attempt to extrapolate first arrivals using a fully data-driven method. We first test the methodology on synthetic data sets, and we then apply ESVI to two published real data sets over the Pärvie fault system in northern Sweden. These data sets were acquired along the same profile at different times with different acquisition parameters and noise levels. The results show that ESVI enhances the SNR of head waves when the noise level is high. That is the same as the conventional SVI. ESVI also increases the number of pickable first arrivals by extrapolating head waves past the original maximum offset of each shot. We also show that the significant increase in first-arrival traveltime picks is beneficial for improving resolution and penetration depth in the tomographic imaging and, consequently, better revealing the subsurface velocity distribution. The tomographic images show higher velocities in the hanging walls of the main Pärvie fault and another subsidiary fault, as interpreted relative to migrated images from previous seismic reflection processing.

10.1093/gji/ggab283

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Citations (3)

ODP Leg 186, Hole 1151D - Well Logging Data

Zenodo (CERN European Organization for Nuclear Research) (2021)

Kiyoshi Suyehiro I. Selwyn Sacks Gary D Acton Michael J. Acierno Eiichiro Araki

10.5281/zenodo.3948626

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Measuring the full stress tensor from hydraulic injection tests: Site investigation for design of underground storage of spent nuclear waste (Olkiluoto, Finland)

AGU Fall Meeting Abstracts (2019)

Maria Ask D. Ask

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Carbonatite ring-complexes explained by caldera-style volcanism

Scientific Reports (2013)

M. Andersson Alireza Malehmir Valentín R. Troll Mahdieh Dehghannejad Christopher Juhlin

Carbonatites are rare, carbonate-rich magmatic rocks that make up a minute portion of the crust only, yet they are of great relevance for our understanding of crustal and mantle processes. Although they occur in all continents and from Archaean to present, the deeper plumbing system of carbonatite ring-complexes is usually poorly constrained. Here, we show that carbonatite ring-complexes can be explained by caldera-style volcanism. Our geophysical investigation of the Alnö carbonatite ring-complex in central Sweden identifies a solidified saucer-shaped magma chamber at ~3 km depth that links to surface exposures through a ring fault system. Caldera subsidence during final stages of activity caused carbonatite eruptions north of the main complex, providing the crucial element to connect plutonic and eruptive features of carbonatite magmatism. The way carbonatite magmas are stored, transported and erupt at the surface is thus comparable to known emplacement styles from silicic calderas.

Carbonatite

Caldera

Silicic

Magma chamber

10.1038/srep01677

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Citations (40)

Stress Analysis in Boreholes Drag Bh and Leknes Bh, Nordland, North Norway

Rock Mechanics and Rock Engineering (2014)

Maria Ask D. Ask Harald Elvebakk Odleiv Olesen

Breakout

10.1007/s00603-014-0683-9

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Citations (13)