I doubt that journalists (especially the TV talking heads) of today have any idea of where the "Ground Zero" label came from.
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Worlds first A-Bomb, prior to Trinity Event
Trinity Site is where the first atomic bomb was tested at 5:29:45 a.m. Mountain War Time on July 16, 1945. The 19 kiloton explosion not only led to a quick end to the war in the Pacific but also ushered the world into the atomic age. All life on Earth has been touched by the event which took place here.
The 51,500-acre area was declared a national historic landmark in 1975.
What You'll See
Included on the Trinity Site tour is Ground Zero where the atomic bomb was placed on a 100-foot steel tower. A small monument now marks the spot. Visitors also see the McDonald ranch house where the world's first plutonium core for a bomb was assembled. The missile range provides historical photographs and a Fat Man bomb casing for display. There are no ceremonies or speakers.
http://www.vivanewmexico.com/sw.trinity.html---------------------------------
My father was a tower guard at a POW camp for Germans about 60 miles from the Trinity Site when the explosion took place. Remember him telling me when I was a child that the sky had lighted up in the dark, dawn hours as if it were noon.
Then it went dark again and it was only after the two bombs were dropped in Japan that he learned what had happened in the NM high desert.