![]() As opposed to the idealized linear movement of a strike-slip fault, the team demonstrated what geologists knew in theory, that shear strain has several stages before final movement along the fault. This is a similar trait we see in many systems on Earth, from rivers finding the easiest path to lower elevations to mammals taking the easiest path from point A to point B.Īs the faults propagate, the team measured how strain is transferred to different parts of the fault, a process that in real life takes millions of years and across many miles. Most aftershocks cluster at major fault bends, surround the regions of high coseismic slip, or extend outward of the ruptured faults. The team found that the faults develop through a "Lazy Earth" hypothesis, whereby the fault propagation takes the easiest path. In one boundary condition, there is a pre-existing fault along the two slabs, in another there is a pre-existing displacement beneath the clay slabs, and in the last example the displacement is in a wider shear zone.Īfter the models were setup, the team moved the two clay slabs in opposite directions in order to measure minute changes as the strike-slip faults developed. A geologic fault in which the blocks of rock on either side of the fault slide horizontally in opposite directions along the line of the. After creating two slabs of this kaolin clay, the team setup several boundary conditions on which to test the development of the strike-slip fault. The team made sure the length to depth was scaled appropriately to mimic that on Earth and with the correct viscosity. Hatem built a miniature model of the Earth's crust using kaolin clay. ![]() Videos - Concise video lectures give background information on the Earth and plate tectonics for teaching how earthquakes happen and how they are studied.To address this, Dr. Software-Web-Apps - Stand alone software, interactive web tools, and downloadable apps to help you explore seismic data and earthquake topics. A strike slip fault is a fault zone where two blocks of land move horizontally rather than vertically along a fault plane. If the block opposite an observer looking across the fault moves to the right, the slip style is termed right-lateral if the block moves to the left, the motion is termed left-lateral. Posters - More than just wallpaper, these eye-catching, educative posters invite students to become minds-on with Earth's internal structure, earthquakes, seismic waves and more! Strike-slip faults are vertical (or nearly vertical) fractures where the blocks have mostly moved horizontally. ![]() It is generally very unlikely that a deforming body will experience 'pure' shortening or 'pure' strike-slip. strike-slip fault, also called transcurrent fault, wrench fault, or lateral fault, in geology, a fracture in the rocks of Earth’s crust in which the rock masses slip past one another parallel to the strike, the intersection of a rock surface with the surface or another horizontal plane. This movement ends up resulting in oblique shear. Lessons - A step-by-step guide outlining what students will learn across one or more class periods, through a progression of activities, combined in a learning cycle, to achieve the desired student learning. In geology, transpression is a type of strike-slip deformation that deviates from simple shear because of a simultaneous component of shortening perpendicular to the fault plane. Interactives - Uses interactive Flash (sfw) to illustrate fundamental concepts that are difficult to convey to learners through other means. The areas between the ends of adjacent segments are known as stepovers. ![]() IRIS offers a range of resources for students, educators and the general public.Īctivities - Bite-sized (5, 15, or 30 minute) demonstrations or student tasks tied to ‘Did You Know?’ questions to engage the learner.Īnimations - Concise animations that illustrate fundamental concepts that are difficult to convey to learners through other means (the real events may be too small, too large, too fast, too slow, or unsafe for the classroom).Ĭourse - A series of lessons that provide the structure for a semester-long undergraduate course.ĭemos - Quick teacher-lead activities (show-and-tell combined with an opportunity for learners to ponder, predict and discuss) to stimulate interest and convey a concept to learners.įact-Sheets- Single page, accessible, discussions of earthquake related topics. When strike-slip fault zones develop, they typically form as several separate fault segments that are offset from each other. ![]()
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