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12 results for “shear fracture”
FIGURE 2. CMM-V-10108, a in A Miocene cetacean vertebra showing a partially healed longitudinal shear-compression fracture, possibly the result of domoic acid toxicity or failed predation
FIGURE 2. CMM-V-10108, a Miocene pathological cetacean vertebra associated with the one shown in Figures 5 and 6. A. Anterior view showing a major shear-compression fracture with comminution. B. right lateral view, and C. posterior view showing the intact fused epiphysis.
FIGURE 3. CMM-V-10108 in A Miocene cetacean vertebra showing a partially healed longitudinal shear-compression fracture, possibly the result of domoic acid toxicity or failed predation
FIGURE 3. CMM-V-10108, shear-fractured Miocene cetacean lumbar vertebra in three transverse CT-scan images. These CT-scan images cut through the vertebra in an anterodorsal-posteroventral direction. A. CT-scan image through the anterior portion of the vertebra showing the wide-open lumen of the shear-compression fracture. B. CT-scan image from approximately 1 cm behind A, showing the thickness of the periosteal reactive bone layer. C. CT-image at about the midpoint in the length of the vertebra showing the posterior-most part of the sheared base of the centrum compressed (telescoped) into the body of the centrum.
FIGURE 7. CMM-V-8522 in A Miocene cetacean vertebra showing a partially healed longitudinal shear-compression fracture, possibly the result of domoic acid toxicity or failed predation
FIGURE 7. CMM-V-8522, Otodus megalodon lower anterior tooth in labial view. This tooth was found touching one of the two pathological vertebrae (CMM-V-10108). Notice the spall-fracture marking the tip of the tooth. White scale bar equals 10 mm.
FIGURE 6. CMM-V-10108, a in A Miocene cetacean vertebra showing a partially healed longitudinal shear-compression fracture, possibly the result of domoic acid toxicity or failed predation
FIGURE 6. CMM-V-10108, a second Miocene pathological cetacean vertebra (also shown in Figure 5) associated with the one shown in Figures 2-4. A. CT-scan image towards the anterior end of the vertebra. B. CT-scan image at about the midpoint in the length of the vertebra showing the thickness of the periosteal reactive bone.
FIGURE 8 in A Miocene cetacean vertebra showing a partially healed longitudinal shear-compression fracture, possibly the result of domoic acid toxicity or failed predation
FIGURE 8. One possible way in which the shear-compression fracture occurred in CMM-V-10108. The posterior vertebral column was severely hyperflexed to such a degree that at least one of its vertebrae experienced a shear-compression fracture, and the periosteum was pulled away from most of the sides of both vertebrae. Artwork by Clarence (Shoe) Schumaker (CMM).
FIGURE 5. CMM-V-10108, a in A Miocene cetacean vertebra showing a partially healed longitudinal shear-compression fracture, possibly the result of domoic acid toxicity or failed predation
FIGURE 5. CMM-V-10108, a second Miocene pathological cetacean vertebra (CT-scans shown in Figure 6) associated with the one shown in Figures 2-4. A. Posterior view showing that the neural spine is incomplete and that the sides of the centrum are covered with periosteal reactive bone. B. ventral view to highlight the periosteal reactive bone. In B, the anterior end of the centrum is up.
FIGURE. 1 in A Miocene cetacean vertebra showing a partially healed longitudinal shear-compression fracture, possibly the result of domoic acid toxicity or failed predation
FIGURE. 1. The site along Calvert Cliffs where the two pathological cetacean vertebrae (CMM-V-10108) and associated Otodus megalodon tooth (CMM-V-8522) were found in situ in Shattuck-Zone 12. Looking north along the cliffs at Warrior's Rest. Photo by M. Ellwood.
FIGURE 4. CMM-V-10108, a in A Miocene cetacean vertebra showing a partially healed longitudinal shear-compression fracture, possibly the result of domoic acid toxicity or failed predation
FIGURE 4. CMM-V-10108, a single CT-scan image in the sagittal plane of a Miocene pathological cetacean vertebra in left lateral view showing the broken lower portion of the centrum, the displaced piece of bone, and the new bone growth (periosteal reactive bone ventrally).
Shear Fracture Caging Test Videos
<p>These videos show shear fracture caging experiments conducted at Los Alamos National Laboratory. More informatio can be found at the following links: </p> <ol> <li>Journal publication: <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.geothermics.2024.103206" target="_blank" rel="noopener">https://doi.org/10.1016/j.geothermics.2024.103206</a></li> <li>Raw data for 8 shear fracture caging tests used in journal publication: <a href="https://doi.org/10.5281/zenodo.10951458" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10951458</a></li> <li>Raw data for 5 shear fracture caging tests: <a href="https://doi.org/10.5281/zenodo.10956588" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10956588</a></li> <li>Raw data for 14 shear fracture caging tests: <a href="https://doi.org/10.5281/zenodo.10957018" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10957018</a></li> </ol>
Towards Fracture Caging in Shear Experiments
<p>The dataset presents experiment data collected during the learning and development process in setting up shear fracture caging experiments. Data from consistent and subsequent experiments can be found at doi.org/10.5281/zenodo.10951458 and doi.org/10.5281/zenodo.10956588. </p> <p>The ReadMeFirst.txt file explains the details.</p>
Imaging elastodynamic and hydraulic properties of in-situ fractured rock: An experimental investigation exploring effects of dynamic stressing and shearing
<p>We describe laboratory experiments to elucidate the relationship between nonlinear elasticity and permeability evolution in fractured media subjected to local stress perturbations. This study is part of an effort to image fluid pathways and fracture properties using active-source acoustic monitoring during fluid injection and shear of rough fractures. Experiments were conducted with L-shaped samples of Westerly granite fractured in-situ under tri-axial conditions with deionized water subsequently circulated through the resulting fractures. After in-situ fracturing, we separately imposed oscillations of the applied normal stress and pore pressure with amplitudes ranging from 0.2 to 1 MPa and frequencies from 0.1 to 40 Hz. During these dynamic perturbations an array of piezoelectric transducers continuously transmitted ultrasonic pulses across the fracture to monitor the evolving elastic response. We interpret the resulting evolution of elastic wave properties in the context of elastic nonlinearity and relate the estimated nonlinearity parameters to the relative change in permeability of the fractured media. Fracture roughness is then altered in-situ by shearing, with the generation of breccia and wear products. We document the evolution of permeability and fracture contact stiffness as a function of dynamic stressing and shear offset and discuss our findings in relation to fractures in Earth's crust.</p>
Plots source data for the Communications Earth & Environment research article titled: Diurnal expansion and contraction of englacial fracture networks revealed by seismic shear wave splitting
<p>The source data for plotting figures presented in the main text of article titled: Diurnal expansion and contraction of englacial fracture networks revealed by seismic shear wave splitting.</p>
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