noun
hypocentral distance
Technical term in seismology: the distance from the seismic source (hypocenter) to a given observation point.
震源距離が大きいほど、地震波の到達時間は遅くなる。
The greater the hypocentral distance, the later the arrival time of seismic waves.
この観
The hypocentral distance for this observation point was estimated to be about 120 kilometers.