| Hub |
| Focal point |
| Seismological focus |
| Shock wave's origin |
| Shock waves' source |
| Earthquake hot spot |
| Focus of seismic activity |
| Where the tremor is worst |
| Focal point, as of a quake |
| Where some waves originate |
| Earthquake origination point |
| Area above an earthquake's origin |
| Where there's a lotta shakin' goin' on |
| Where there's a whole lot of shaking going on |