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![Illustration of <span class="search-highlight">Krauklis</span> <span class="search-highlight">waves</span> (initiated by the incident tube <span class="search-highlight">waves</span>) trave...]()
![Example of suspected <span class="search-highlight">Krauklis</span> <span class="search-highlight">waves</span> following the perf shot and recorded on...]()
![(a) Phase velocity and (b) spatial attenuation of <span class="search-highlight">Krauklis</span> <span class="search-highlight">waves</span> for a real...]()
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![Pseudocolor photoelastic images of experiment 3 (sawtooth fracture filled w...]()
![The temporal stress field of the <span class="search-highlight">Krauklis</span> <span class="search-highlight">wave</span> of experiments (a) 1, (b) 2,...]()
![(a) The temporal waveform of the <span class="search-highlight">Krauklis</span> <span class="search-highlight">wave</span> of the repeated experiment 1...]()
![The dispersion curve of the <span class="search-highlight">Krauklis</span> <span class="search-highlight">wave</span> for the three experiments. Note t...]()
![(a) <span class="search-highlight">Krauklis</span> <span class="search-highlight">wave</span> amplitude in the fracture-parallel direction, normalized ...]()
![Phase velocities of a <span class="search-highlight">Krauklis</span> <span class="search-highlight">wave</span> as functions of frequency for different...]()
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![Model setup for studying <span class="search-highlight">Krauklis</span> <span class="search-highlight">wave</span> initiation by an incident plane body...]()
![Snapshots from simulation of <span class="search-highlight">Krauklis</span> and elastic <span class="search-highlight">waves</span> excited by an impos...]()
![The amplitude spectra of the first and last traces of the temporal stress f...]()
![Phase velocities of surface <span class="search-highlight">waves</span> in a trilayer with marble plates as funct...]()
1-20 OF 53 RESULTS FOR
Krauklis waves
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Journal Article
Krauklis wave initiation in fluid-filled fractures by seismic body waves
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 06 December 2013
Geophysics (2014) 79 (1): T27–T35.
...Marcel Frehner ABSTRACT Krauklis waves are a special wave mode that is bound to and propagates along fluid-filled fractures. They can repeatedly propagate back and forth along a fracture and eventually fall into resonance emitting a seismic signal with a dominant characteristic frequency...
FIGURES
| View All (7)
Journal Article
Krauklis wave in a trilayer
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 07 July 2014
Geophysics (2014) 79 (4): L33–L39.
...Valeri Korneev; Ludmila Danilovskaya; Seiji Nakagawa; George Moridis ABSTRACT The Krauklis wave is a slow dispersive wave mode that propagates in a fluid layer bounded by elastic media. The guided properties of this wave and its ability to generate very short wavelengths at seismic frequency range...
FIGURES
| View All (5)
Journal Article
Krauklis wave in a stack of alternating fluid-elastic layers
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 21 December 2011
Geophysics (2011) 76 (6): N47–N53.
...Valeri A. Korneev ABSTRACT The Krauklis wave is a slow dispersive wave mode that propagates in a fluid layer bounded by elastic media. In a model of alternating fluid and elastic layers, two interface waves can exist at low frequencies: The first wave propagates mostly in the elastic layer and has...
FIGURES
| View All (4)
Journal Article
Hydraulic fracture diagnostics from Krauklis-wave resonance and tube-wave reflections
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 21 March 2017
Geophysics (2017) 82 (3): D171–D186.
...Chao Liang; Ossian O’Reilly; Eric M. Dunham; Dan Moos ABSTRACT Fluid-filled fractures support guided waves known as Krauklis waves. The resonance of Krauklis waves within fractures occurs at specific frequencies; these frequencies, and the associated attenuation of the resonant modes, can be used...
FIGURES
| View All (12)
Journal Article
Laboratory evidence for Krauklis-wave resonance in fractures and implications for seismic coda wave analysis
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 07 September 2016
Geophysics (2016) 81 (6): T285–T293.
...Pei-Ju Rita Shih; Marcel Frehner ABSTRACT Krauklis waves are of major interest because they can lead to resonance effects in fluid-filled fractures. This resonance is marked by seismic signals with a dominant signature frequency, which may reveal fracture-related rock properties. In our laboratory...
FIGURES
| View All (5)
Image
Illustration of Krauklis waves (initiated by the incident tube waves) trave...
in Inferring hydraulic connectivity of induced fractures in the near-wellbore region using distributed acoustic sensing-recorded tube waves excited by perforation shots
> Geophysics
Published: 25 February 2022
Figure 9. Illustration of Krauklis waves (initiated by the incident tube waves) traveling up and down the conductive length of the induced fracture at a frequency and decay rate dependent on the geometry of the fracture.
Image
Example of suspected Krauklis waves following the perf shot and recorded on...
in Inferring hydraulic connectivity of induced fractures in the near-wellbore region using distributed acoustic sensing-recorded tube waves excited by perforation shots
> Geophysics
Published: 25 February 2022
Figure 10. Example of suspected Krauklis waves following the perf shot and recorded on DAS. (a) Wavefield in stage 26 following a perf shot from stage 27. (b) Transformation of the windowed section in (a) from the time-space domain to the frequency-space domain. (c) Wavefield in stage 32
Image
(a) Phase velocity and (b) spatial attenuation of Krauklis waves for a real...
in Hydraulic fracture diagnostics from Krauklis-wave resonance and tube-wave reflections
> Geophysics
Published: 21 March 2017
Figure 3. (a) Phase velocity and (b) spatial attenuation of Krauklis waves for a real frequency. (c) Phase velocity and (d) temporal attenuation for a real wavelength. Dispersion and attenuation curves are plotted for four fracture widths: 0.5, 1, 3, and 10 mm, as labeled. The dashed black
Journal Article
Physical modeling of fluid-filled fractures using the dynamic photoelasticity technique
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 06 January 2021
Geophysics (2021) 86 (1): T33–T43.
...Haitao Cao; Ezequiel Medici; Roohollah Askari Abstract We have developed an optical apparatus based on the dynamic photoelasticity technique to visualize and analyze the propagation of the Krauklis wave within an analog fluid-filled fracture. Although dynamic photoelasticity has been used by others...
FIGURES
| View All (13)
Image
Pseudocolor photoelastic images of experiment 3 (sawtooth fracture filled w...
in Physical modeling of fluid-filled fractures using the dynamic photoelasticity technique
> Geophysics
Published: 06 January 2021
Figure 6. Pseudocolor photoelastic images of experiment 3 (sawtooth fracture filled with shampoo), at (a) 0.0 ms, (b) 0.3 ms, (c) 0.6 ms, (d) 0.9 ms, (e) 1.2 ms, and (f) 1.5 ms. The red dashed lines correspond to the maximum stress field initiated by the Krauklis waves. Due to the residual stress
Image
The temporal stress field of the Krauklis wave of experiments (a) 1, (b) 2,...
in Physical modeling of fluid-filled fractures using the dynamic photoelasticity technique
> Geophysics
Published: 06 January 2021
Figure 7. The temporal stress field of the Krauklis wave of experiments (a) 1, (b) 2, and (c) 3. The waveforms of experiments 1 and 2 are obtained from the seven fixed points indicated in Figure 3 , whereas those of experiment 3 are from the six teeth of the sawtooth fracture. The dashed arrow
Image
(a) The temporal waveform of the Krauklis wave of the repeated experiment 1...
in Physical modeling of fluid-filled fractures using the dynamic photoelasticity technique
> Geophysics
Published: 06 January 2021
Figure 13. (a) The temporal waveform of the Krauklis wave of the repeated experiment 1. The dashed arrow shows the maximum stress field of the Krauklis wave of the image sequence. (b) The dispersion curve extracted by high-resolution linear Radon transform for the repeated experiment 1.
Image
The dispersion curve of the Krauklis wave for the three experiments. Note t...
in Physical modeling of fluid-filled fractures using the dynamic photoelasticity technique
> Geophysics
Published: 06 January 2021
Figure 11. The dispersion curve of the Krauklis wave for the three experiments. Note that the flat water-filled fracture has the highest velocity. The velocity significantly increased in the sawtooth fracture filled with shampoo (experiment 3 compared to experiment 2), which implies the possible
Image
(a) Krauklis wave amplitude in the fracture-parallel direction, normalized ...
Published: 06 December 2013
Figure 6. (a) Krauklis wave amplitude in the fracture-parallel direction, normalized by the incident P-wave amplitude, as a function of the recording position along the fracture and the inclination angle of the fracture α . The white line corresponds to the location where the analytical
Image
Phase velocities of a Krauklis wave as functions of frequency for different...
Published: 07 July 2014
Figure 4. Phase velocities of a Krauklis wave as functions of frequency for different plate thicknesses.
Journal Article
Inferring hydraulic connectivity of induced fractures in the near-wellbore region using distributed acoustic sensing-recorded tube waves excited by perforation shots
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 25 February 2022
Geophysics (2022) 87 (3): D101–D109.
...Figure 9. Illustration of Krauklis waves (initiated by the incident tube waves) traveling up and down the conductive length of the induced fracture at a frequency and decay rate dependent on the geometry of the fracture. ...
FIGURES
| View All (11)
Image
Model setup for studying Krauklis wave initiation by an incident plane body...
Published: 06 December 2013
Figure 1. Model setup for studying Krauklis wave initiation by an incident plane body wave. The boundaries are far enough away from the central fracture not have any reflections from the boundaries polluting the analyzed seismograms. Boundary and initial conditions are explained in the text.
Image
Snapshots from simulation of Krauklis and elastic waves excited by an impos...
in Hydraulic fracture diagnostics from Krauklis-wave resonance and tube-wave reflections
> Geophysics
Published: 21 March 2017
Figure 2. Snapshots from simulation of Krauklis and elastic waves excited by an imposed pressure chirp at the fracture mouth, for a 10 m long fracture with a 4 mm width at the fracture mouth. The background shows the solid response (to scale), and the inset shows the fluid response (vertically
Image
The amplitude spectra of the first and last traces of the temporal stress f...
in Physical modeling of fluid-filled fractures using the dynamic photoelasticity technique
> Geophysics
Published: 06 January 2021
Figure 8. The amplitude spectra of the first and last traces of the temporal stress fields of experiments (a) 1, (b) 2, and (c) 3, from the traces shown in Figure 7a – 7c . As the Krauklis wave travels, the high frequencies are attenuated. The Krauklis wave from (a) experiment 1 is richer
Image
Phase velocities of surface waves in a trilayer with marble plates as funct...
Published: 07 July 2014
Figure 2. Phase velocities of surface waves in a trilayer with marble plates as functions of frequency. Shown are the solutions V 1 and V 2 of the exact equation 50 and solutions of equations 28 , 35 , and 36 , representing Rayleigh ( V R ), Krauklis
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