JAKARTA, Indonesia — A powerful 6.4-magnitude earthquake struck the popular tourist destination of Lombok, east of Bali, on Sunday, killing at least 12 people and sending villagers fleeing into open fields to avoid collapsing buildings.

“We jumped out of our beds to avoid anything falling on our heads,” said Jean-Paul Volckaert, who was woken by the quake at the hotel he runs near Senggigi, on the western side of the island of Lombok.

“The water in the pools was swaying like a wild sea,” he said by telephone.

Electricity was cut off in the worst-hit area, Sembalun, a sparsely populated area of rice paddies on the northern side of the island.