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demonstrated that the frequency of earthquake aftershocks decays following a mainshock, based on his analysis of the 1889 Kumamoto, 1891 Mino-Owari and the 1893 Kagoshima earthquakes.

In 1897, Emil Wiechert's theoretical calculations led him to conclude that the Earth's interior consists of a mantle of silicates, surrounding a core of iron.

In

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