The Indonesian meteorology and geophysics agency (BMG) on Tuesday warned of aftershocks following an 8.7-magnitude quake that shook Nias island near Sumatra late Monday.
"There have been 20 aftershocks since the major quake, but their magnitudes were at 4 to 5 on the Richter scale that only local people could feel," BMG official Suharjono said here.
He said the aftershocks are less likely to trigger a tsunami.
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