Hypocenter A,hypocenter,or,hypocentre,from,AncientGreek:,ὑπόκεντρον,hypόkentron,for,below,the,center,is,the,point,of,origin,of,an,earthquake,or,a,subsurface,nuclear,explosion,It,is,a,synonym,of,the,focus1,Confusingly,,the,term,hypocenter,is,also,used,as,a,synonym,for,ground,zero,,the,surface,point,directly,beneath,a,nuclear,airburst Earthquakes An,earthquakes,hypocenter,is,the,position,where,the,strain,energy,stored,in,the,rock,is,first,released,,marking,the,point,where,the,fault,begins,to,rupture1,This,occurs,directly,beneath,the,epicenter,,at,a,distance,known,as,the,focal,or,hypocentral,depth1 The,focal,depth,can,be,calculated,from,measurements,based,on,seismic,wave,phenomena,As,with,all,wave,phenomena,in,physics,,there,is,uncertainty,in,such,measurements,that,grows,with,the,wavelength,so,the,focal,depth,of,the,source,of,these,long-wavelength,low,frequency,waves,is,difficult,to,determine,exactly,Very,strong,earthquakes,radiate,a,large,fraction,of,their,released,energy,in,seismic,waves,with,very,long,wavelengths,and,therefore,a,stronger,earthquake,involves,the,release,of,energhypocenter,vs,epicenter,,hypocenter,of,an,earthquake,,hypocenter,meaning,,hypocenter,campaign,advanced,warfare,find,rpg,,hypocenter,or,focus,,hypocenter,cenotaph,Hypocenter ,