Seismic Gap<em> is a kind of an active fault that has not suffered with any of the significant earth-quaked from a long duration of time.
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And Seismic Gap is the lack of large as well as big earthquakes in a particular place with a tectonic front. It is also an active fault which generally becomes the reason for other earthquakes.
D. changes in temperature trends. There are four major layers, all separated by temperature. Increasing or decreasing temperature of the gases in the layers keeps them separated.