Answer:
Well if there is lines through the map that's a topographical, but if it's just colors then it's a special purpose
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It's because of Plate tectonics.
The seismic activities are usually in areas that are not populated, plus, the activity is deep in the ocean or in the earth’s core. The shifting of the earth's plates doesn't only occur on the surface, some occur deep down in the surface, causing us not to feel them. <span> Moreover, seismographs are able to detect low frequencies, causing them to be able to detect even the slightest movement of the plates down under. </span>
