AGAIN EARTHQUAKE……..

A strong,3.6 magnitude earthquake attacked San Francisco on Tuesday night, and the next morning a second earthquake struck in Central California. San Francisco suffered a dangerous earthquake just last night.On 24^th August 2011,another 4.2 magnitude earthquake hit east in Central California.USGS try to find if the two earthquakes were related.

People felt so nervous.Now they are afraid of current situation.

Now earthquakes are common calamity in the U.S.Colorado also faced a small earthquake on Monday and the large quake hit Tuesday.

Earthquake has really become a big danger for U.S.

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