News from The Associated Press: "... The magnitude-6.6 quake was centered 60 miles (100 kilometers) southwest of the city of Medan and 62 miles (110 kilometers) beneath the earth's crust, according to the U.S. Geological Survey.
It was too far inland to generate a tsunami.
The quake hit at about 1 a.m. (1800 GMT Monday), rattling people from their sleep in towns and villages across the island's northern tip...
... Indonesia straddles a series of fault lines that makes the vast island nation prone to volcanic and seismic activity.
A giant quake off the country on Dec. 26, 2004, triggered a tsunami in the Indian Ocean that killed 230,000 people, half of them in Indonesia's westernmost province of Aceh..."