震源

1. Origins, structure, and basic meaning

• Structure: 震源 (しんげん) is the seismic noun for an earthquake's hypocenter or source point.
• Basic usage: 地震の震源を確認する locates the source; 震源までの距離 measures from an observation point to it.

2. Common pitfalls and similar expressions

• The underground source of an earthquake
  • 震源 is the underground point where an earthquake rupture begins. It is distinct from the surface epicenter, and distance may be measured from an observation point to this source.