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1755 Lisbon earthquake, coinciding with the general flowering of science in Europe, set in motion intensified scientific attempts to understand the behaviour and causation of earthquakes. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Michell determined that earthquakes originate within the Earth and were waves of movement caused by "shifting masses of rock miles below the surface".