Where does “南海地震” come from?

南海地震 (Japanese) comes from Japanese 地震, from Japanese 地, from Middle Chinese 地.

南海地震 (Japanese): A megathrust earthquake occurring at Nankai Trough off the coast of Shikoku in Japan once in approximately 100 years, especially that occurred on December 21, 1946

Definitions

A megathrust earthquake occurring at Nankai Trough off the coast of Shikoku in Japan once in approximately 100 years, especially that occurred on December 21, 1946

Ancestry of “南海地震”, step by step

南海地震 traces back through two separate lines of ancestry.

via Japanese 地震

Step	Language	Word	Meaning
1	Japanese	地震	an earthquake
2	Japanese	地	earth, dirt; fabric, cloth; territory
3	Middle Chinese	地	—

via Japanese 南海

Step	Language	Word	Meaning
1	Japanese	南海	a southern sea; South China Sea; Short for 南海道

Every word from Middle Chinese 地 →Every word from Japanese 地 →Every word from Japanese 地震 →