Elastic dislocation theory: Investigating the effects of the free surface on the symmetry of displacement across a fault
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. School of Earth Sciences Undergraduate Research Theses; 2017
The current model we use for computing dislocation of free surface by earthquakes fault is mostly perfectly planar or perfectly spherical and there is no topography. In real world distance between free surface displacement fault plane varies and does not match up with GPS station in ideal model. To acknowledge exact problem, why this is a big problem, we examined the movement of the free surface and dislocation at right above and below the fault plane in the model we created. This model will have equilateral triangle displacement with 100m length in side horizontal under different depth from free surface. We will also look close to the center of the triangle to see right above and below the displacement surface to see the absolute displacement behavior due to different depth. There was couple of experiment for 1m, 10m, 50m, and 100m. The result was remarkable that it showed huge distinctive difference as the depth changes. The surface displacement showed triangular displacement as we plotted for the fault plane and it emerged out as the depth got deeper. The displacement right above and below the fault plane always had same burger’s factor through all depth but absolute vector for above and below the displacement plane had irregular ratio but as the depth goes deeper, it showed almost identical anti-symmetry. The result proves that current model will always derive with biased calculation until we improve or develop new method for dislocation model.
Academic Major: Earth Sciences
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