Where does “東南海地震” come from?

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

東南海地震 (Japanese): A megathrust earthquake occurring at Nankai Trough off the coast of Kii Peninsula in Japan once in approximately 100 years, especially that occurred on December 7, 1944

Definitions

A megathrust earthquake occurring at Nankai Trough off the coast of Kii Peninsula in Japan once in approximately 100 years, especially that occurred on December 7, 1944

Ancestry of “東南海地震”, step by step

東南海地震 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 東南海

Step	Language	Word	Meaning
1	Japanese	東南海	—

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