Japan issues Tsunami warning

Japan warns of 10-foot tsunami after 7.5 magnitude Taiwan quake. USGS reports 7.4 magnitude, 18km south of Hualien City. Volcanic eruptions and landslides can trigger tsunamis threatening coastal areas. This is said to be the strongest earthquake in Taiwan in the last 25 years. ​​Tsunamis are primarily triggered by underwater disturbances such as earthquakes.