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[quote user="JSGreen"]Are trenches better, in an engineering sence, to elevated grade seperation in earthquake prone areas? <br>[/quote]<br><br>Good question, to which the answer is "sort of." The trench walls, which are typically retaining walls with adjacent roadways and structures, have to be engineered to avoid failure, both for its own integrity as well as the foundation integrity of adjoining structures, and every roadway overpass is in effect an elevated structure. It's not just enough to have structures survive the earthquake without collapse; you also want them to survive without significant damage so that the infrastructure keeps working and (1) its economic ability to generate income does not cease for a long period, and (2) society isn't burdened with the cost of replacing it.<br><br>In many ways the elevated railway structure is cheaper and easier to design for seismic loads.<br><br>S. Hadid<br>
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