Third Major Earthquake Rocks Island of Sumatra

Another powerful earthquake struck Indonesia's Sumatra island Monday, according to the U.S. Geological Survey.

The latest on Monday evening was at least the third: a 6.9-magnitude aftershock strike off the coast of Sumatra, according to UGS.

No tsunami warning was immediately issued.

It appeared to be at least the third in a series of quakes, with two or more strong ones reportedly hitting the same region earlier on Monday.

There was a brief tsunami warning after the first quakes, but no reports of damage, injuries or deaths.

The second quake had a preliminary magnitude of about 6.7. Another, which occurred early Monday morning, had a magnitude of 7.3, according to the U.S. Geological Survey.

Click here for more earthquake information from the USGS

The geophysics agency issued a tsunami bulletin following the quake first quake, but canceled it an hour later after determining no waves were generated.

Indonesia, which straddles a series of active fault lines, is prone to seismic and volcanic activity. A giant earthquake along the same coast spawned the large tsunami that killed more than 230,000 people in a number of countries in December 2004.