Strong 7.1 earthquake rattles southwestern Japan, triggers tsunami advisories USA TODAYJapan Issued Its First ‘Megaquake’ Warning After Powerful Tremor BloombergJapan Warns of Elevated Risk of Giant Earthquake After Strong One Hits The New York TimesKyushu escapes major damage from magnitude 7.1 earthquake The Japan TimesJapan ‘Megaquake’ Advisory After Tremor Injures Eight Barron’s