1.Human migration involves the movement of people from one place to another with intentions of SETTLING, permanently or temporarily, at a new location.2.Emigrate means to leave one's country to live in another. Immigrate is to come into another country to live permanently. Migrate is to move, like birds in the winter. The choice between emigrate, immigrate, and migrate DEPENDS on the sentence's point of view.3.A tsunami is a series of waves in a WATER body caused by displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explosions above or below water all have the potential to generate a tsunami.4. Earthquakes are recorded by a seismographic network. Each seismic station in the network measures the movement of the ground at that site. The slip of one block of rock over another in an earthquake releases ENERGY that MAKES the ground vibrate. ... Magnitude is the most common measure of an earthquake's size.