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Artist's commentary
Intensity 4 earthquake (of the Japanese earthquake scale) on each country's fleet girls
From the artist's tweet (6:14 pm - 25 May 2015 [JST])
See also:
”Tokyo rattled by 5.6-magnitude earthquake; no immediate reports of injuries or damage” (Daily News, May 25, 2015)
”M5.6 earthquake rocks Kanto region” (JapanToday, 25, 2015)
”5.3 magnitude earthquake 2 km from Hasuda, Saitama, Japan” (Earthquake Track, May 25, 2015)