A local geological agency official says a powerful 7.7-magnitude earthquake has struck eastern Indonesia.A tsunami warning was immediately issued.
The official, Fauzi, said the underwater quake hit off Sulawesi island. He did not have any immediate reports about damage or injuries.
The US Geological Survey said today the quake struck 21 kilometers beneath the sea and was centered 135 kilometers from Gorantalo, a coastal town on Sulawesi.
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.