Earthquakes

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by JoeBrnnn
Last updated 4 years ago

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Earth Sciences

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Earthquakes

EarthQaukes

By Joe Brennan

How Are Earthquakes Caused?

"Earthquakes are usually caused when rock underground suddenly breaks along a fault." (http://www.geo.mtu.edu/UPSeis/why.html)This sudden release of energy causes the ground to 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." (http://www.geo.mtu.edu/UPSeis/why.html) Soon, the rocks begin to break. This is when the earthquake happens. During and after an earthquake, the rocks continue to move until they get stuck again which causes the foreshocks and aftershocks.

What is An Earthquake?

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." (Google/dictionary) Earthquakes are severly disruptive. They are Earths natural means of releasing stress, just like us. All the stress builds up on Earth just like it builds up on us, which causes it to crack. More than 1 million earthquakes happen each year, but thankfully they are under 2.5 on the Richtor scale so we can't feel it happen. Earthquakes cause can cause a great deal of destruction even though they are usually less than a minute. They can cause fires that last for several days and tsunami's that destroy everything they come across. They even cost tens of thousands human lives. Earthquakes are one of the most expensive natural disasters a human can ever face. It causes great finacial damage along with the damage to the earth and your community.

Devastating Earthquakes

"On March 11, 2011, a magnitude-9 earthquake shook northeastern Japan, unleashing a savage tsunami. The effects of the great earthquake  were felt around the world." (http://www.livescience.com/39110-japan-2011-earthquake-tsunami-facts.html) This was a horrific day for Japan. This unforgettable, unexpected natural disaster was the worst earthquake in Japanese history. "The unexpected disaster was neither the largest nor deadliest earthquake and tsunami to strike this country. More than 18,000 people were killed in the disaster. Most died by drowning. Less than an hour after the earthquake, the first of many tsunami waves hit Japan's coastline. The tsunami waves reached run-up heights of up to 128 feet and traveled inland as far as 6 miles in Sendai. The tsunami flooded an estimated area of approximately 217 square miles in Japan." Followed by the earthquake, there were 50 aftershocks. The people couldn't get a break. This was by far one of the most deadliest and biggest earthquakes in the world.

How Are They Recorded?

Earth quakes are recorded using the Richtor Scale. It assigns how powerful an earthquake was. It tells you how much energy from the earth is released during the earthquake. It detects even the slightest Seismic Waves. So, the Richtor Sclae collects data from the seismic waves and determines how powerful it was and how much energy was released.

What Affect Do They Have On Us?

Powerful and widespread shaking grounds can cause buildings to collapse; damage utility lines, other structures and roads; set off fires; and threaten the lives of people and animals. It is the damage of structures that presents 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" (http://captainzap3.tripod.com/id2.html)


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