There were no immediate reports of injuries or damage.
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In December 2004, a massive earthquake off Sumatra island triggered a tsunami that battered much of the Indian Ocean coastline and killed more than 230,000 people
Indonesia is prone to seismic upheaval due to its location on the so-called Pacific "Ring of Fire," an arc of volcanos and fault lines encircling the Pacific Basin.
Last week, a powerful 7.5 magnitude earthquake jolted eastern Indonesia, killing at least four people, damaging hundreds of homes and briefly triggering a region-wide tsunami warning.