A 5.6-magnitude earthquake shook the Indonesian island of Nias Sunday but there were no casualties or concerns about possible tsunamis, officials said.
The tectonic quake struck at 08:28 pm (0128 GMT) local time and was centered about 55 kilometers (34 miles) northwest of Nias' main town of Gunung Sitoli, said Suharjono of the meteorological agency in Jakarta.
He said the quake was 33 kilometers under the sea and was felt in Gunung Sitoli at between 4-5 on the Mercalli scale.
"It is still an aftershock of the major earthquake off Nias of March 2005," Suharjono said.
A 7.7-strength undersea temblor earlier this month triggered a tsunami that lashed the south coast of Java island, killing more than 600 people.
