A strong earthquake measuring 6.7 on the Moment magnitude scale struck Ecuador early on Wednesday, one month after a devastating 7.8 magnitude quake that killed some 660 people, the US Geological Survey said.
Ecuador's national geological institute, which measured the quake at 6.8, said it struck at 2:57 am local time in the South American country's western Manabi region.
US geologists said there was no tsunami threat from the quake. It was not immediately known whether there were casualties or serious damage.
The quake had a depth of 32 kilometres and was centered 136 kilometres northwest of Quito, seismologists said.
Last month's quake was the worst to strike Ecuador in decades, causing buildings and roads to collapse, with the cost of the damage totalling billions of dollars.