noun
region of anomalous seismic intensity
Technical term used in seismology for an area where observed shaking is stronger or weaker than expected given the distance from the epicenter.
この地震では、震源から遠い地域で異常震域が観測された。
In this earthquake, a region of anomalous seismic intensity was observed in an area far from the epicenter.
Compound of 異常 (anomalous) + 震域 (seismic region).