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by Joe4269
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Earth Sciences

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An earthquake is a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action. They are severly disruptive. They are Earths natural means of releasing stress, just like us. More than a million earthquakes happen each year. Earthquakes happen when two blocks of the Earth suddenly slip past one another. This causes a sudden release of energy that cause seismic waves, and this makes the Earthquake happen. Earthquakes can cause a great deal of destruction, even though they only last for less than a minute. Earthquakes can cause fires that last for days and tsunamis that destroy everything they meet. They cost tens of thousands of human lives. Earthquakes are one of the most expensive natural disasters a human can face. That can cost more than billions of dollars. It causes great finacial damage along with the damage of the earth and your community.


By Joe Brennan

How Are EarthQuakes Caused?

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. They don't just slide smoothly; the rocks catch on each other. The rocks are still pushing against each other, but not moving. After a while, the rocks break because of all the pressure that's built up. When the rocks break, the earthquake occurs. During the earthquake and afterward, the plates or blocks of rock start moving, and they continue to move until they get stuck again.

The Richter Scale measures the magnitude of the seismic waves or vibrations that travels across the earth’s surface. The scale uses a logarithmic formula using high-frequency data collected from seismograph stations.

How Are Earth Quakes Recorded?

What Affects Do EarthQuakes Have On Us?

Powerful and widespread ruptures or shaking ground can cause buildings to move off their foundations or collapse; damage utility lines, other structures and roads; set off fires; and threaten the lives of people and animals. It is the damage to structures that presents the greatest risks to life and property. Earthquakes can effect our lives in many ways. They cause fires that burn buildings to the ground. This effects you because now you have nowhere to live. They also can destroy whole towns. Family members can be trapped under the rubble inside the house. Now you will mourn for their loss. During an earthquake, tsunamis are created and destroy everything in their path.

Devastating Earthquakes

On March 11, 2011, a magnitude-9 earthquake shook northeastern Japan, unleashing a savage tsunami. More than 18,000 people were killed in the disaster. Less than an hour after the earthquake, the first of many tsunami waves hit Japan's coastline. The waves overtopped and destroyed protective tsunami seawalls at several locations. The massive surge destroyed three-story buildings where people had gathered for safety.The Earthquake unleashed a 23-foot tsunami and was followed by more than 50 aftershocks for hours, many of them of more than magnitude 6.0. It was a disaster. The people couldn't get a break. Even today, 4 years later, people are still recovering from this unforgettable disaster. It was the worst Earthquake in Japanese history and one of the worse Earthquakes in the world.

How Are They Recorded?

What Is An Earthquake?


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