出典:Wiktionary
From the general term ground zero.
Ground Zero
出典:『Wiktionary』 (2016/03/17 00:33 UTC 版)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/07 19:43 UTC 版)
The term ground zero (sometimes also known as surface zero as distinguished from zero point) describes the point on the Earth's surface closest to a detonation. In the case of an explosion above the ground, ground zero refers to the point on the ground directly below the detonation (see hypocenter).