Tsunami caused by a distant, extra-regional earthquake.

A strong earthquake lasting 20 seconds or more, a noticeably rapid rise or fall in coastal waters, a significant withdrawal of the sea and/or a roaring sound are all possible warning signs of an approaching tsunami.

These are a series of sea waves caused by a mass disturbance of water usually generated by an undersea earthquake, volcanic eruption, landslides, or meteors impacting the sea. Eruptions at submarine volcanoes may also generate tsunami. The Kick-‘em-Jenny volcano just off the north-west coast of Grenada is one such regularly active volcano in the Eastern Caribbean. However, currently, its depth below the surface makes tsunami generation unlikely. Approaching tsunamis are sometimes heralded by a noticeable rise or fall in coastal water. Historical records show that the Virgin Islands earthquake of 1867 generated a tsunami which affected St. Thomas and Tortola in the Virgin Islands.