ground zero

IPA(Pronunciation)

/ˌɡɹaʊnd ˈzɪəɹəʊ/

Noun

countable uncountable broadly figuratively

Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation.

Japanese Meaning

（元々の意味）原子爆弾が空中で爆発する際、その下に位置する陸地や水面の一点。 / （現在の意味）爆発地点とされる、陸地または水面上のその場所。

What is this buttons?

Google Translation / DeepL Translation

彼らは、空中で核爆弾が爆発した直下の地表点を爆心地として特定した。

Details

Sense（1）

Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation.

Some of the construction details (reinforcing rod splices, for example) [in Hiroshima and Nagasaki, Japan] were often poor, and much of the concrete was definitely weak; thus some reinforced concrete buildings collapsed and suffered structural damage when within 2,000 feet of ground zero, and some internal wall paneling was demolished even up to 3,800 feet.

Google Translation / DeepL Translation

Details

Sense（2）

(by extension) The location of any disaster or violent assault.

"This is ground zero," she said. "If regulators don't adopt a zero tolerance for violations of standards then what we will have are places that are going to have unacceptable environmental damage."

Google Translation / DeepL Translation