A5001139865- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Seismology and Earthquake Studies
- Landslides and related hazards
- Hydrocarbon exploration and reservoir analysis
- Earthquake Detection and Analysis
- Geological Studies and Exploration
- Geophysical Methods and Applications
- Hydraulic Fracturing and Reservoir Analysis
- Geophysics and Sensor Technology
- Geochemistry and Geologic Mapping
- Geological Modeling and Analysis
- Geomagnetism and Paleomagnetism Studies
- Rock Mechanics and Modeling
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Geophysical and Geoelectrical Methods
- Ultrasonics and Acoustic Wave Propagation
- Geological and Tectonic Studies in Latin America
- Paleontology and Stratigraphy of Fossils
- Geotechnical and Geomechanical Engineering
- Geophysics and Gravity Measurements
University of Alberta
2016-2025
Xinjiang Agricultural University
2025
Xinjiang Institute of Water Resources and Hydropower Research
2025
Jinan University
2025
Tianjin Medical University General Hospital
2024
Beijing University of Chinese Medicine
2017
Kansas State University
2005
Lamont-Doherty Earth Observatory
2005
Columbia University
2005
Planetary Science Institute
1998-2003
A sharp increase in the frequency of earthquakes near Fox Creek, Alberta, began December 2013 response to hydraulic fracturing. Using a fracturing database, we explore relationships between injection parameters and seismicity response. We show that induced are associated with completions used larger volumes (104 105 cubic meters) seismic productivity scales linearly volume. Injection pressure rate have an insignificant association Further findings suggest geological factors play prominent...
Abstract This paper summarizes the current state of understanding regarding induced seismicity in connection with hydraulic fracturing operations targeting Duvernay Formation central Alberta, near town Fox Creek. We demonstrate that earthquakes this region cluster into distinct sequences time, space, and focal mechanism using (i) cross‐correlation detection methods to delineate transient temporal relationships, (ii) double‐difference relocations confirm spatial clustering, (iii) moment...
Abstract Within central Alberta, Canada, a new sequence of earthquakes has been recognized as 1 December 2013 in region previous seismic quiescence near Crooked Lake, ~30 km west the town Fox Creek. We utilize cross‐correlation detection algorithm to detect more than 160 events end 2014, which is temporally distinguished into five subsequences. This observation corroborated by uniqueness waveforms clustered subsequence. The Lake Sequences have come under scrutiny due its strong temporal...
Abstract Historically, seismicity documented in the Western Canada Sedimentary Basin has been relatively quiescent and earthquakes are usually restricted to foreland belt of Rocky Mountains. However, exceptional clusters events, which have remained active for decades, recognized Alberta. In this study we investigate region using data obtained from recently established regional arrays, emphasizing relationship between a disposal well Cordel Field nearby cluster previously reported...
Resolution of the pattern large‐scale shear velocity variations above and below known postulated mantle discontinuities could provide constraints on nature mineral phase transitions, changes in composition, scale convection. To achieve good resolution across a full range depths, we use diversified data set consisting body wave waveforms, travel times, surface velocities. Our main focus is 670‐km discontinuity, long presumed to be an important barrier, or impediment, whole has relatively high...
We analyze recordings from more than 3000 shallow earthquakes and measure S 410 – 660 differential travel times on a global scale. These are obtained using novel cross‐correlation technique that eliminates effects associated with priori assumptions of crustal thickness velocity variations above the upper mantle transition zone. Our measurements show absolute perturbations up to 8 s average (242 km), which imply zone ±20 km length scale ∼2000 km. The under major subduction zones, e.g.,...
Abstract Focal mechanisms of induced earthquakes reflect anthropogenic contributions to preexisting geological features and fault slippages. In this paper, we examine fault‐related (double‐couple (DC)) possibly fluid‐related (non‐double‐couple (non‐DC)) ( M 2–6) at regional scales. We systematically compare well‐resolved focal 33 events in the Western Canada Sedimentary Basin, among which 12 were by hydraulic fracturing one secondary recovery. Most seismicity is dominated strike‐slip/thrust...
Abstract An earthquake with a reported magnitude of 4.4 ( M L ) was detected on 13 June 2015 in western central Alberta, Canada. This event the third felt this year near Fox Creek, shale gas exploration region. Our results from full moment tensor inversions regional broadband data show strong strike‐slip mechanism near‐vertical fault plane solutions. The decomposition solution is overwhelmingly double couple, while only modest (∼20%) contribution attributed to...
Abstract We use a sequence of induced earthquakes near Crooked Lake, Alberta, to investigate the physical differences between and tectonic earthquakes. Starting with Natural Resources Canada earthquake catalogue, we spectral ratio method calculate static stress drops group relocated ranging from December 2013 June 2015. find that fall within high side typical reported range events show no correlation magnitude, depth, or distance well. The appear roughly constant for M w 3 4. Relocated...
Abstract Earthquakes induced by human activities can impede the development of underground resources. Significant events (M5) have caused both economic and losses. The recent M L 5.6 ( W 5.1) event near Peace River, Alberta occurs in a region situ bitumen recovery. We find that 3.4 cm ground deformation was reverse fault slip (∼29 cm), possibly related to River Arch faulting. Events are located within shallow basement, nearby significant wastewater injection into Paleozoic strata....
Until now, modelling of three-dimensional (3-D) velocity variations in the mantle and topography transition zone discontinuities have been considered separately. Velocity models were obtained assuming that radii are constant. Then, travel time data sensitive to topography, such as SS precursors, corrected for effect 3-D seismic structure inverted depth a discontinuity. Such procedure is unsatisfactory, it may introduce artefacts could significantly affect topographic results; opposite...
The discrimination between chemical and thermal heterogeneity in the Earth's mantle remains one of most important challenging questions to be answered by observational theoretical geophysics. To answer this question requires a thorough knowledge ratio compressional shear velocity anomalies. We describe results joint inversion for using large diverse data set consisting traveltimes, complete waveforms surface wave dispersion measurements. A horizontal tessellation 362 spherical splines is...
More than 60 small earthquakes ( M L 0.7–3.0) were detected from December 2011 to March 2012 north of Cardston, Alberta, an area with little evidence for previous seismic activity. The timing these events closely correlates (>99.7% confidence) hydraulic fracturing completions the Devonian–Mississippian-age Exshaw Formation at a nearby horizontal well. Unanimous waveform multiplicity within swarm suggests that share similar origin and source mechanism. This observation is corroborated by...
On 2016 January 12, an intraplate earthquake with initial reported local magnitude (ML) of 4.8 shook the town Fox Creek, Alberta. While there were no damages, this was widely felt by residents and suspected to be induced nearby hydraulic-fracturing (HF) operations. In study, we determine source parameters using moment tensor inversions, then detect locate associated swarm a waveform cross-correlation based method. The broad-band seismic recordings from regional arrays suggest (M) 4.1 for...
In the process of long-distance pressurized pipeline water transmission, in addition to problem hammer hazards that can easily occur pipeline, safety before pump also presents hidden dangers. When excessive pressure occurs whole it lead leakage or even pipe bursting. this work, we analyze head a pumping station using modeling calculations from KY PIPE software, combined with data an actual transmission project, study effect stopping hammer. The use two-phase check valves effectively solve...
Zika virus (ZIKV) is a member of the Flaviviridae family and causes congenital microcephaly Guillain–Barré syndrome. Currently, there lack approved vaccines or therapies against ZIKV infection. In this study, we profile vRNA‒host protein interactomes at stem‒loop B (SLB) reveal that interleukin enhancer binding factor 3 (ILF3) DEAH-box helicase 9 (DHX9) form positive regulators antiviral RNA inference in undifferentiated human neuroblastoma cells induced pluripotent stem cell-derived neural...
This study addresses the issue of rockbursts in thick and hard roof strata triggered by mining activities proposing long-hole staged hydraulic fracturing technology, effectiveness which was validated through numerical simulation field trials. To gain a deeper understanding mechanical mechanisms this macro–micro dual-scale model constructed, integrating mesoscale solid rock units cohesive to simulate macroscopic mass effects at interfaces localized areas. Based on model, simulations...
Abstract Sealing pressure distribution data can be obtained through finite element simulation calculations, which are essential for reliable product designs. An accurate, statically measured sealing must developed to calibrate the model. In this study, a measurement approach in wheel-side housing of an electric drive axle is proposed, based on flexible thin-film sensor. A fitting algorithm implemented obtain and contact surface bandwidth end up 200 units, spanning circumferential direction...
This study uses seismological principles and techniques including waveform simulations travel time calculations to reveal the nature of ultrasound wave propagation in long bones at small offsets (source-to-receiver distances) times. Our experiments confirm existence reflected converted body waves originating from interaction internal interfaces a bone structure. We demonstrate that responses can be successfully simulated properly interpreted based on simple, horizontally layered approximation.
Using a proper parametrization, the source displacement field of seismic event can be efficiently reconstructed by redundant dictionary Green′s functions based on sparse representation theory. Then, subjecting pre-existing records and pre-computed into sparsity-promoting algorithm, it is possible to simultaneously evaluate origin time, hypocentre coordinates moment tensor. The proposed method applicable single- or multiple-source scenarios and, with minor adjustments, valuable tool for...