WASHINGTON, Nov 15 (Reuters) - Two powerful aftershocks, including a magnitude 6.8, hit northern Chile on Thursday, a day after a massive quake struck the area, the U.S. Geological Survey said.

It said the 6.8-magnitude aftershock, only 21.7 miles (35 km) deep, was centered 58 miles (93 km) northeast of Antofagasta in mineral-rich northern Chile.

Two minutes earlier, another aftershock, initially reported at magnitude 6.5 but later revised to 6.2, hit the same area, where Wednesday's 7.7-magnitude temblor killed two people and injured more than 100.

(Reporting by Sandra Maler; )

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