1. An area along tectonic plate boundaries where many faults are located.
2. A measurement of the magnitude of an earthquake.
3. A small earthquake that precedes a larger earthquake.
4. An instrument that records the seismic waves.
5. A type of stress that squeezes rock, forcing it to break or fold.
6. A sudden tremor or movement in the rock of the Earth’s crust.
7. Seismic waves that move along the surface of the Earth.
8. A small earthquake that occurs after a larger earthquake.
9. The point on the earth’s surface directly above the focus of an earthquake.
10. A break in the earth’s crust where the movements of the rock may occur.
11. A measurement of the amount of energy released by an earthquake.
12. Vibrations that carry the energy released during the earthquake.
13. A force that causes rocks to change shape.
14. The point at which the movement of the rock produces an earthquake.
15. A large ocean wave caused by an underwater earthquake.

1. These faults are commonly found in collisions zones, where tectonic plates push up mountain ranges such as the Himalayas and the Rocky Mountains. All faults are related to the movement of Earth's tectonic plates. The biggest faults mark the boundary between two plates.

2.The Richter scale measures the magnitude of earthquakes, and the Mercalli scale measures their intensity. ... Furthermore, earthquake intensity, or strength, is distinct from earthquake magnitude, which is a measure of the amplitude, or size, of seismic waves as specified by a seismograph reading

3. Foreshocks are earthquakes that precede larger earthquakes in the same location. An earthquake cannot be identified as a foreshock until after a larger earthquake in the same area occurs.

4. Seismographs are instruments used to record the motion of the ground during an earthquake. They are installed in the ground throughout the world and operated as part of a seismographic network.

5. Compression squeezes rocks together, causing rocks to fold or fracture (break)Compression is the most common stress at convergent plate boundaries.

6. An earthquake is the sudden movement of Earth's crust at a fault line. The location where an earthquake begins is called the epicenter. An earthquake's most intense shaking is often felt near the epicenter.

7.There are several different kinds of seismic waves, and they all move in different ways. The two main types of waves are body waves and surface waves. Body waves can travel through the Earth's inner layers, but surface waves can only move along the surface of the planet like ripples on water.

8. Aftershocks are a sequence of earthquakes that happen after a larger mainshock on a fault. Aftershocks occur near the fault zone where the mainshock rupture occurred and are part of the "readjustment process” after the main slip on the fault.

9. The point on the Earth's surface directly above the focus is the epicenter. When energy is released at the focus, seismic waves travel outward from that point in all directions.

10. Faults are cracks in the earth's crust along which there is movement. These can be massive (the boundaries between the tectonic plates themselves) or very small. If tension builds up along a fault and then is suddenly released, the result is an earthquake.

11. Richter Scale

Richter ScaleThe magnitude of an earthquake, usually expressed by the Richter Scale, is a measure of the amplitude of the seismic waves. The moment magnitude of an earthquake is a measure of the amount of energy released - an amount that can be estimated from seismograph readings

12. Seismic waves are vibrations that travel through Earth carrying the energy released during an earthquake.

13. stress

stressThese forces are called stress. In response to stress, the rocks of the earth undergo strain, also known as deformation. Strain is any change in volume or shape.

14. In an earthquake, the initial point where the rocks rupture in the crust is called the focus (sometimes called the hypocenter). The epicenter is the point on the land surface that is directly above the focus. In about 75% of earthquakes, the focus is in the top 10 to 15 kilometers (6 to 9 miles) of the crust.

15. A tsunami is an ocean wave triggered by large earthquakes that occur near or under the ocean, volcanic eruptions, submarine landslides, or by onshore landslides in which large volumes of debris fall into the water.