Strike Dip
Strike Dip - Related Videos
05:36
Determining Spatial Orientation of Rock Layers with the Brunton Compass
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2023
Source: Laboratory of Alan Lester - University of Colorado Boulder Most rock units exhibit some form of planar surfaces or linear features. Examples include bedding-, fault-, fracture-, and joint-surfaces, and various forms of foliation and mineral alignment. The spatial orientation of these features form the critical raw data used to constrain models addressing the origin and subsequent deformation of rock units. Although now over 100 years since its invention and introduction, the Brunton...
03:19
A Technique to Inflict Closed-Head Traumatic Brain Injury in Drosophila Flies
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2025
This video demonstrates a procedure to inflict a closed-head traumatic injury in anesthetized Drosophila flies using a strike device with a gas-propelled impactor. The injury affects neuronal function and impairs walking ability.
08:45
Percussion
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2023
Source: Jaideep S. Talwalkar, MD, Internal Medicine and Pediatrics, Yale School of Medicine, New Haven, CT Simply stated, percussion refers to the striking of one object against another to produce sound. In the early 1700s, an Austrian inn-keeper's son, named Leopold Auenbrugger, discovered that he could take inventory by tapping his father's beer barrels with his fingers. Years later, while practicing medicine in Vienna, he applied this technique to his patients and published the first...
02:26
Photoelectric Effect
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2020
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
10:15
A Novel Method to Model Chronic Traumatic Encephalopathy in Drosophila
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Cited by 19 •
2017
Here, we describe a new approach to inflict closed-head traumatic brain injury in Drosophila melanogaster. Our method has the advantage of directly delivering repetitive impacts with adjustable strength to the head alone. Further exploration of the invertebrate system will help to illuminate the pathogenesis of chronic traumatic encephalopathy.
FAQs
Together, the two measurements convert a planar feature’s orientation into information that can be interpreted across a landscape or subsurface. Strike provides the horizontal reference, while dip indicates the direction and steepness of descent. That combination helps show whether layers, faults, fractures, or foliation may guide water movement or influence the behavior of slopes and excavated ground.
Dip direction identifies the side toward which a plane descends, not merely how steep it is. In environmental investigations, that directional relationship helps connect geological orientation with groundwater movement, contaminant transport, and slope behavior. A dip angle without its direction would provide incomplete spatial information for interpreting how subsurface pathways or discontinuities interact with terrain.
Strike and dip are complementary rather than interchangeable measurements. Two planes can share a similar strike yet differ in dip angle or dip direction, producing different three-dimensional orientations. Recording all relevant parts of the measurement therefore distinguishes geological surfaces that may have different effects on water movement, slope stability, excavation conditions, or hazard evaluation.
Field collection centers on observing the planar geological feature and using a geological compass with a clinometer. The compass supplies the directional measurement associated with strike, while the clinometer supplies the angle associated with the plane’s steepest descent. These observations create an orientation record that can support geological mapping and later environmental interpretation.
Strike and dip data show the orientation of layers, faults, fractures, or other discontinuities that may influence subsurface water movement. By relating these orientations to the surrounding geological setting, investigators can assess how water may move through or along planar features. This information supports groundwater-flow assessment and helps interpret subsurface conditions relevant to environmental studies.
The orientation of rock layers and discontinuities can affect how slopes and excavated ground behave. Strike identifies the horizontal alignment of a plane, while dip indicates its descending direction and steepness, allowing investigators to evaluate its relationship with terrain or excavation surfaces. These measurements therefore contribute to slope-stability analysis, excavation assessment, and geological hazard evaluation.