Earthquake: n. a vibration or movement of a part of the Earth's surface, due to the faulting of rocks, to volcanic forces, etc.
earthquake is a shaking of the ground caused by the sudden breaking and shifting
of the earth’s rocky outer shell. Shifting tectonic plates can cause
earthquakes. An earthquake can releases up to ten thousand times more energy
than the first atomic bomb. An earthquake or some type of tremor occurs every
thirty seconds. Many last a few seconds, and some occasionally last several
Earthquakes can also lead to other natural disasters. For example, an
earthquake can cause an avalanche, tsunami/tidal wave, volcanic eruption, and
floods. They can also destroy towns, cities, and lives.
Seismographs or seismometers measure earthquakes. Tremors felt by the
earthquakes move a needle with a pin on the end. The pin moves back and forth.
The wider the line gets, the worse the earthquake is. Readings from stations
widely spaced out are compared to pinpoint the exact origin of the earthquake.
This has become an effective early warning system to help predict tsunamis that
will occur in the Pacific Ocean.
in the United States occur mostly in California, because of the San Andreas
Fault. The fault forms a “gash” across the California desert.