Before revision: Early speculations on the natural causes of earthquakes were included in the writings of Thales of Miletus ( c. 585 BCE ), Anaximenes of Miletus ( c. 550 BCE ), Aristotle ( c. 340 BCE ), and Zhang Heng (132 CE).
After revision: Early speculations on the natural causes of earthquakes were included in the writings of Thales of Miletus ( ), Anaximenes of Miletus ( ), Aristotle ( ), and Zhang Heng (132 CE).