hypocentre

Noun

Meaning

(geology) The focus of an earthquake, directly under the epicentre.

(military) The point on the surface below an atmospheric explosion; ground zero

Source: en.wiktionary.org

epicentre

Finally, the lake's long axis points to the hypocentre of the Tunguska explosion, about convert away. Source: Internet

Lake Cheko is a small, bowl-shaped lake approximately convert north-northwest of the hypocentre. Source: Internet