An earthquake measuring 5.6 on the Richter scale shook the Indonesian island of Nias on Friday, but there were no immediate reports of casualties or property damage, a meteorologist said.
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The offshore quake hit at 7:41 am (1241 GMT), with the epicenter 62 kilometers (20.5 miles) west of the main town of Gunung Sitoli, at a depth of 33 kilometres, said Yono of the Jakarta meteorology office.
On March 28, an 8.7-magnitude earthquake killed more than 900 people on Nias off the southwest coast of Sumatra.
Indonesia sits on the so-called Pacific Rim of Fire, where the meeting of continental plates causes high volcanic and seismic activity.
A 9.3-magnitude quake along the same fault-line as Thursday's tremor triggered last year's Indian Ocean tsunami disaster which left more than 217,000 people dead or missing.