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Finally there is the common question of what is the maximum magnitude for the whole world. Unfortunately, it cannot really be answered, since this earthquake has most likely not happened in the historical record, and we cannot search beyond the earth for analogs. Answers can again be inferred using
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interiors. The circles represent actual earthquake data. Note that the dataset is complete for small magnitudes, but becomes erratic for the larger. At about M5, there are no records, simply because the historical record is usually too short. In some cases paleoseismology can fill some of the gap,
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The last part of the curve, perhaps the most important part, can be filled in by inference. This would come from studying similar geology throughout the world (using analogs to extend time), or by a study of
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the finite size of the world's plates (plate tectonics), and the possible limits of the various magnitude scales. The specific value, however, is not directly relevant to most people, since, except for
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The seismic hazard calculation involves a double integration (
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that has not yet occurred in the region under study.
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