Earth Watch
Earthquakes, floods, hurricanes... all that moves

A natural disaster

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A Quick Tip by Sharrie

  • Apr 11, 2011
Oh no! Another earthquake in Japan today (11 Apr, a month right after the last disastrous earthquake) measuring 6.6! The tremors were once again felt in Tokyo! What a nightmare!
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Quick Tip by . August 10, 2010
posted in Earth Watch
When the earth moves, lives are shattered. I've noticed an increase in earthquakes in recent years. Our planet is certainly getting angrier and angrier. Hopefully wherever and whenever it happens, loss of lives are minimized! Nothing can prevent it, the only way to cope is to be prepared for it. Unfortunately, most countries are not.
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Sharrie ()
Ranked #1
I'm a traveler at heart & have been nicknamed Travel Queen by friends & colleagues alike. Traveling has been my life passion for the last decade or so. As we enter a new decade, I'm excited … more
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An earthquake (also known as a quaketremortemblor or seismic activity) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are measured with a seismometer; a device which also records is known as a seismograph. The moment magnitude (or the related and mostly obsolete Richter magnitude) of an earthquake is conventionally reported, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale.

At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacing the ground. When a large earthquake epicenter is located offshore, the seabed sometimes suffers sufficient displacement to cause a tsunami. The shaking in earthquakes can also trigger landslides and occasionally volcanic activity.

In its most generic sense, the word earthquake is used to describe any seismic event — whether a natural phenomenon or an event caused by humans — that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults, but also by volcanic activity, landslides, mine blasts, and nuclear experiments. An earthquake's point of initial rupture is called its focus or hypocenter. The ...

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