The Piqiang Fault is a left-lateral fault. The unit of rock layers that moves toward the viewer relative to the red fault line is on the left. This method always works, no matter from which direction you are looking at the boundary!įigure 2.6.8. If it is on the left side, it is left-lateral. If the plate moving toward you is on the right side, the motion is right-lateral.Purple arrows show the direction the rock units (blue circles) are moving relative to a person looking down the red fault line. Based upon those displaced features, decide which rock unit appears to be moving toward you.Blue circles indicate distinctive rock units that have been displaced from one another by the fault. Find features that have been displaced apart from one another due to the sliding motion of the plates or rock units.įigure 2.6.6.The red color traces the fault line between rock units. Normal faults result from tensional forces when rocks are displaced away from each other. Identify the boundary between the two rock units.įigure 2.6.5. The most important fault types include: Normal faults, reverse faults, transform (strike-slip) faults, and oblique faults.To determine what type of transform fault it is, follow these steps: Google Earth imagery showing the transform Piqiang fault in China. For example, below is the Piqiang fault from China: Figure 2.6.4. How are these diagram different from the ones on Figure 2.6.2?Ī type of transform plate motion can be identified by examining the two tectonic plates from a bird’s-eye view. The different colors represent rock layers. Figure 2.6.3 Block diagram and horizontal view of a transform fault. Block diagram and horizontal view of a transform fault. Can you notice the difference? Figure 2.6.2. An examination of the two transform faults below demonstrates that they are very similar. ![]() However, these categories are not determined by the composition of the lithosphere. The motion at a transform fault is classified into two categories: right-lateral and left-lateral. Transform faults refer to the lateral displacement of large rock units due to the shearing motion caused by a transform boundary. Transform boundaries can cause both large faults and a series of smaller associated faults. Perhaps the most famous transform boundaries, however, are those on the continental lithosphere with effects that are directly felt by nearby cities and towns. Because the surrounding rock along the ridge is hard and brittle, it accommodates these shifts in spreading rates with sliding motions. They occur near these divergent boundaries because the spreading rate changes along a ridge. Most transform boundaries are associated with the spreading spreading centers at mid-ocean ridges. Although none of these events occur at transform boundaries, they are far from boring the continuous stress that builds within the lithosphere from the sliding motion causes faulting and earthquakes. No lithosphere is destroyed or created, and mountain chains are not built at transform boundaries. Shear stress operates at transform boundaries, which involves sliding motion. This motion does not create or destroy crust and will cause earthquakes, but no volcanoes.Ī transform boundary occurs when two tectonic plates move past one another. A transform boundary causes a fault between two plates of the lithosphere, which will slide past one another. The son of a Presbyterian minister.Figure 2.6.1. First propos… Colin Munro Macleod, MacLeod, Colin Munro The mid-ocean ridge is an interconnected system of undersea volcanoes that meander over the Earth like the raised seams on a basebal… Seafloor Spreading, seafloor spreading, theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges. ![]() ![]() the Cooley-Tukey method) which enables the Fourier transformation of digitized wave-forms to be accom… Mid-ocean Ridge, Mid-Ocean Ridges make a thorough or dramatic change in the form, appearance, or character of: lasers have transformed cardiac surg… Fast Fourier Transform, fast Fourier transform (FFT) An algorithm (e.g.
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