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aftershock a small earthquake that follows a larger one. Aftershocks start at or near the same place where the first earthquake started. There are often several aftershocks after the first earthquake.
destruction Destruction is the ways things are after there has been terrible damage. The result of a large fire or earthquake is destruction. [1/2 definitions]
earthquake An earthquake is a dangerous thing that happens. When there is an earthquake, part of the earth's surface shakes. In a strong earthquake, buildings can fall down and streets can break open.
epicenter the point on the earth's surface directly above the central source of an earthquake.
magnitude the unit of measurement for the strength of an earthquake. [1/4 definitions]
quake an earthquake. [1/3 definitions]
scale3 A scale is a series of steps or degrees from low to high. For example, when someone describes how strong an earthquake is, they often use a scale that uses numbers from 1 to 9. An earthquake measured as a 1 on this scale is a mild earthquake that doesn't cause much damage to an area. An earthquake measured as a 7 on this scale causes a lot of damage, and an earthquake measured as a 9 causes complete destruction. There are other scales for measuring earthquakes too. [1/4 definitions]
tremor a shaking caused by an earthquake. [1/2 definitions]
tsunami a very large, often destructive, sea wave that is caused by an earthquake or explosion of a volcano under the ocean.