Earthquakes on the west coast of Japan have triggered warnings of tsunami waves in South Korea. The eastern province of Gangwon has warned residents in several cities and counties of tsunamis by text message, national news agency Yonhap reported on Monday. People near the coast have been advised to seek safety in higher areas. After a series of smaller waves in the early evening local time, the weather bureau later registered a tsunami wave of 67 centimetres off the coastal town of Donghae. The office warned that subsequent waves in the Sea of Japan – which Koreans call the East Sea – could re…