Tsunami experts theorize that shock waves produced after a massive underwater volcanic eruption near Tonga on Jan. 15 caused the higher tidal levels seen along Japan's Pacific coastline.

During an emergency news conference early Jan. 16, the agency said the latest tidal surge was quite different from a typical tsunami generated by an offshore earthquake, noting that water levels ...

the massive cohort of aging Americans represents a tidal wave that will rock almost every aspect of our economy. AARP calls this demographic trend the “Silver Tsunami.” Other financial ...

The effects of the sea bed earthquake and following tsunami that devastated southeastern ... 30 centimeters compared to the normal forecasted tidal influx and recess. We haven't seen a similar ...

Tsunamis (pronounced soo-ná-mees), also known as seismic sea waves (mistakenly called "tidal waves"), are a series of enormous waves created by an underwater disturbance such as an earthquake ...

After Supertyphoon Haiyan hit the Philippines, even key leaders were swept up in the tsunami-like storm surge. The WSJ's Ramy Inocencio speaks with a national Cabinet minister, the Tacloban mayor ...