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JAKARTA, Indonesia — Two powerful earthquakes hit Indonesia on Wednesday, causing buildings to sway in the capital, and authorities issued a tsunami warning for much of the Indian Ocean region, The Associated Press and Reuters reported.
The U.S. Geological Survey said the first quake had a preliminary magnitude of 7.9 and hit at about 6:10 p.m. (7:10 a.m. EDT). It was centered 9.7 miles underground in the southern Sumatra area, the USGS said.
Shortly after, Reuters reported a second earthquake of the same magnitude hit Indonesia's Sumatra region.
The Pacific Tsunami Warning Center issued a tsunami warning for wide areas of the region.
"Earthquakes of this size have the potential to generate a widespread destructive tsunami that can affect coastlines across the entire Indian Ocean Basin," it said.
In Jakarta, tall buildings swayed for several minutes after the first temblor, and occupants rushed down the stairs to escape.
Indonesia, the world's largest archipelago, is prone to seismic upheaval due to its location on the so-called Pacific "Ring of Fire," an arc of volcanoes and fault lines encircling the Pacific Basin.
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