hypocentral region; seismic source region
Technical term in seismology referring to the area around the earthquake focus where rupture occurs.
震源域は地下約10キロの深さに位置している。
The hypocentral region is located at a depth of about 10 kilometers underground.
Compound of 震源 (shingen, 'hypocenter') and 域 (iki, 'region, area').