Can an earthquake from outside of the region cause a tsunami?
Yes, a tsunami may be generated from earthquakes occurring both within and outside of the region. However, there are three conditions necessary for the generation of a tsunami: the earthquake must occur beneath the ocean and be strong (at least of magnitude 6.5), the earthquake must occur at a shallow depth (less than 50km below the surface of the Earth), and the earthquake must be dip-slip in nature (which means there is a vertical component, which displaces a large volume of the sea).
