Discovering Eartquake

1. The location within earth along a fault at which the first motion of an earthquake occurs.
4. Rebound The sudden return of elastically deformed rock to its undeformed shape.
5. A movement or trembling of the ground that is caused by a sudden release of energy when rocks along a fault move.
7. A sea wave of local or distant origin that results from large-scale seafloor displacements associated with large earthquakes, major submarine slides, or exploding volcanic islands.
8. The point on earth's surface directly above an earthquake's starting point,or focus.
9. A seismic body wave that shakes the ground back and forth perpendicular to the direction the wave is moving.
11. The thin and solid outermost layer of Earth above the mantle.
12. The central part of Earth below the mantle
13. The solid, outer layer of earth that consists of the crust and the rigid upper part of the mantle.
14. A break in a body of rock along which one block moves relative relative to another.
15. A seismic body wave that shakes the ground back and forth in the same direction and the opposite direction as the direction the wave is moving.
19. An instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not.

2. Gap A section of a fault that has produced earthquakes in the past but is now quiet.
3. A number that characterizes the relative size of an earthquake, and is based on measurement of the maximum motion recorded by a seismograph.
6. The solid, plastic layer of the mante between the lithosphere;made of mantle rock that flows very slowly, which allows tectonic plates to move on top of it
9. Waves A seismic seismic wave that is trapped near the surface of the earth.
10. A record written by a seismograph in response to ground motions produced by an earthquake, explosion, or other ground-motion sources.
16. Wave A seismic wave that moves through the interior of the earth, as opposed to surface waves that travel near the earth's surface.
17. The layer of rock between the earth's crust and core.
18. Zone The area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves.