A5002602038- Seismic Imaging and Inversion Techniques
- Landslides and related hazards
- Cryospheric studies and observations
- Seismic Waves and Analysis
- Winter Sports Injuries and Performance
- Hydraulic Fracturing and Reservoir Analysis
- Drilling and Well Engineering
- Seismology and Earthquake Studies
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Radiomics and Machine Learning in Medical Imaging
- Marine and environmental studies
- Reservoir Engineering and Simulation Methods
- Earthquake Detection and Analysis
- Arctic and Russian Policy Studies
- Methane Hydrates and Related Phenomena
- Cancer and biochemical research
Institute of Geophysics
2016-2025
Polish Academy of Sciences
2016-2025
ETH Zurich
2020-2021
Polish Geological Institute
2018
University of Helsinki
2018
Glacier surges are periods of significantly increased ice flow due to ice-dynamic feedbacks, in contrast more conventional advances or other responses changes mass balance. In the Arctic, a ring surging glacier clusters can be found extending from Alaska-Yukon Novaya Zemlya. The ‘Arctic ring’ encapsulates Svalbard, an archipelago with long history glaciological observations and consequently measurements surges. However, estimates number surge-type glaciers across range...
Abstract Fractures contribute to bulk elastic anisotropy of many materials in the Earth. This includes glaciers and ice sheets, whose fracture state controls routing water base thus large-scale flow. Here we use anisotropy-induced shear wave splitting characterize structure probe subsurface drainage beneath a seismometer network on an Alpine glacier. Shear observations reveal diurnal variations S-wave up 3%. Our modelling shows that when elevated by surface melt, subglacial pressures induce...
Microseismic monitoring is the only tool to provide locations of microseismic events induced e.g. during hydraulic fracturing unconventional reservoirs. Obtained become a baseline for evaluation stimulation effectiveness. However, due several factors, they can be different from true ones and lead misinterpretation. Most important inaccuracy velocity model used in location procedure, which often amplified by seismic anisotropy. Even though anisotropy common feature organic-rich mudrocks, it...
A precise velocity model is necessary to obtain reliable locations of microseismic events, which provide information about the effectiveness hydraulic stimulation. Seismic anisotropy plays an important role in event location by imposing dependency between wave velocities and its propagation direction. Building anisotropic that accounts for effect allows more accurate events. We have used downhole records from a pilot fracturing experiment Lower-Paleozoic shale gas play Baltic Basin, Northern...
Observations of azimuthal seismic anisotropy provide useful information, notably on stress orientation and the presence preexisting natural fracture systems, during hydraulic fracturing operations. Seismic can be observed through measurement S-wave splitting (SWS) waveforms generated by microseismic events recorded downhole geophone arrays. We have developed measurements from a Lower Paleozoic shale play in northern Poland. The orthorhombic anisotropic symmetry system is dominated vertically...
Summary Precise microseismic event location is necessary to correctly assess the hydraulic stimulation effectiveness. In order obtain proper locations reliable uncertainty analysis have be performed. Location computed with use of Bayesian inversion efficiently characterised by probability density function (pdf). We present approach for events recorded a single vertical receiver array during fracturing in northern Poland. compare cumulative all standard representation as maximum likelihood...
A strong VTI fabric can dominate the influence of weaker azimuthal anisotropy on seismic wave propagation, causing ambiguities, making it challenging to invert geophysical observations for fracture orientations and densities. We employ SWS technique a microseismic dataset collected in vertical borehole during hydraulic stimulation shale gas target northern Poland image strike density masked by signature. In order overcome enhance inversion stability we integrate data with parameters obtained...
ABSTRACT Retreating glaciers are a consequence of warming climate. Thus, numerous monitoring campaigns being carried out to increase understanding this on-going process. One phenomenon related dynamic glacial changes is glacier-induced seismicity; however, weak seismic events difficult record due the sparse seismological network in arctic areas. We have developed an automatic procedure capable detecting using records from single permanent station. To distinguish between and non-glacial...
Approximately 21% of Svalbard’s glaciers are classified as surge-type and undergo cyclical changes in ice velocity between quiescent (slow) active (fast) phases. Whilst it is generally understood that processes at the glacier bed drive surge initiation, physical mechanisms translating basal sliding to flow variability cyclicity remain open questions. Recent mapping velocities across Svalbard has identified an acceleration Borebreen tidewater which terminates on northwestern side...
The sedimentary processes taking place beneath contemporary surging glaciers are difficult to observe directly, yet they crucial for building a holistic understanding of glacier surge and mechanisms. Settings where the sediment-landform assemblages characterising ice-bed interface preserved without significant modification therefore an important archive subglacial that active during surge. At tidewater glaciers, landforms often excellently in submarine setting, but analysis these beyond...
Summary A precise velocity model is necessary to obtain reliable locations of microseismic events, which provide information about the effectiveness hydraulic stimulation. Seismic anisotropy plays an important role in event location by imposing dependency between wave velocities and its propagation direction. Building anisotropic allows for more accurate events. In this paper we develop a workflow VTI construction absence SH-waves perforation shots data. carry Thomsen’s γ parameter...
<p>The release of icebergs into the ocean through glacier calving is a major source mass loss from tidewater glaciers across Arctic. However, there are very few direct measurements activity in Svalbard at daily to sub-daily resolution which impedes our understanding how these processes influence ice discharge and therefore regional patterns balance. Quantifying important because archipelago contains ~10% total Arctic area holds sea-level equivalent ~1.5 cm. In this...
Abstract. Changes in the global temperature balance have proved to a major impact on cryosphere and therefore retreating glaciers are symbol of warming climate. Long-term measurements geophysical parameters provide insight into dynamics those processes over many years. Here we explore possibility using data recorded by permanent seismological stations monitor glacial seismic activity. Our study focuses year-to-year changes seismicity Hansbreen glacier (southern Spitsbergen). We processed...
The problem of landslides is one the greatest challenges in geohazard research. Due to their unpredictability, and complicated genesis, detailed accurate observation necessary. Despite many studies on subject, a general scheme for recognition has still not been developed. An additional, important fact that recently observed impact current state climate, human response it. In presented research results, an example where anthropogenic factors can have significant evolution creeping...
High-melt areas of glaciers generate a rich spectrum ambient seismicity. These signals do not only contain information about the source mechanisms (e.g. englacial fracturing, water flow, iceberg detachment, basal stick-slip motion) but also carry seismic wave propagation within glacier ice and, therefore, mechanical properties ice. In summer 2021 two arrays were deployed in Southern Spitsbergen at vicinity Hansbreen’s terminus, one being placed directly on glacial ice, yielding an...
Summary Landslides are a growing threat in mountainous areas. The current observable state of the climate, with intensification rainfall instead snowfall, and increasing urbanization expanding areas prone to soil slide. In presented case, Cisiec (Southern Poland), anthropogenic natural factors cause formation evolution landslide area ski slope. 5 years multimethod geophysical observations, allowed us estimate variability study zone, along an understanding triggering their impact. acquired...