noun
hypocenter; focus
The point underground where an earthquake originates. Often contrasted with 震央 (epicenter), which is the point on the surface directly above it.
See also: 震央
震源の深さは約10キロと推定されている。
The depth of the hypocenter is estimated to be about 10 kilometers.
気象庁は震源と震央の位置を発表した。
The Japan Meteorological Agency announced the locations of the hypocenter and the epicenter.