Textron unveils TSUNAMI family of drone boats / Japan hit by magnitude 6.6 earthquake, tsunami threat declared over / Magnitude 6.9 earthquake rattles southwestern Japan as tsunami threat declared over / No tsunami threat after 6.8 earthquake in southwestern Japan / Magnitude 6.9 earthquake rattles southwestern Japan, followed by tsunami advisories / After 20 years, the post-tsunami generation stays vigilant for future disasters / Tsunami simulation shows 9m wave swamping Mount Maunganui in virtual reality / A strong quake hits Japan's Noto region but there's no tsunami danger / Small tsunami hits Japan's remote Izu islands after magnitude 5.9 earthquake / Small tsunami waves splash ashore on remote Japanese islands