Computational infrastructure involves link of geographically distributed observations and computation
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Seismic sensors, SAR etc.
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So hardware supports computation, data storage and access
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IGNORE Special Purpose Computers (such as GRAPE in Japan) for O(N2) particle dynamics which could for instance be used in Green's function approach to equation solvers.
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These have 100 times performance of "conventional parallel machines" but maybe there are much larger algorithmic improvements to be gained which require classic parallel computers
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Assume GEM simulations will use classic mix of computers from PC's, Workstation. PC clusters, up to Origin/SP MPP's
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Choose software (e.g. Fortran/C+MPI) supporting this range
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