Magnitude-6.9 aftershock rocks Chile

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SANTIAGO, Chile -- A series of strong aftershocks from last month's devastating quake rocked Chile on Thursday as a new president was sworn into office and immediately urged coastal residents to move to higher ground in case of a tsunami.

The strongest aftershock, with a magnitude of 6.9, was nearly as strong as the quake that devastated Haiti's capital, Port-au-Prince, on Jan. 12. There were no immediate reports of damages or injuries.

The Chilean Navy issued a tsunami warning while the U.S. Pacific Tsunami Warning Center said the aftershocks were too small to cause dangerous waves beyond Chile's central coast.

President Sebastian Pinera was inaugurated at a congressional building in coastal Valparaiso before the building was evacuated as a precaution. The seven aftershocks strongly swayed buildings, shook windows and sent frightened Chileans streaming into the street.

The magnitude-6.9 aftershock was the strongest since the magnitude-8.8 quake on Feb. 27. It occurred along the same fault line, said geophysicist Don Blakeman at the U.S. Geological Survey in Golden, Colo. The USGS initially estimated the aftershock's magnitude at 7.2.

"When we get quakes in the 8 range, we would expect to see maybe a couple of aftershocks in the 7 range," he said.

Mr. Blakeman said Chile now can expect to feel "aftershocks of the aftershock."

"It's not a sign of anything different happening, but what does occur when you get these large aftershocks, typically we have a whole series of aftershocks again," Mr. Blakeman said.

The government's emergency office -- much criticized for failing to issue a tsunami alert that might have saved hundreds of lives from the towering waves that followed the initial quake -- urged Chileans to seek higher ground even though the epicenter of Thursday's biggest shock was inland.

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