prefixing element in kanji compounds, adding a meaning of later, after, following, rearward

later, afterwards, some time after the present

after

later, afterwards, some time after the present

(spatially) the back, the rear, behind / (temporally) later, afterwards, some time after the present / the rest

one's backside / the back, the rear (both spatially and temporally)

subsequently, afterwards

Kyūjitai form of 地震学: seismology

a large earthquake; typically has a magnitude 7 or greater

a large earthquake; typically has a magnitude 7 or greater