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A powerful earthquake struck the Indonesian tourist island of Lombok, killing at least 91 people and shaking neighboring Bali, as authorities said Monday that rescuers still hadn't reached some hard-hit areas and the death toll could climb.

It was the second deadly quake in a week to hit Lombok. A July 29 quake killed 16 people and damaged hundreds of houses, some of which collapsed in Sunday evening's magnitude 7.0 temblor, killing those inside.

National Disaster Mitigation Agency spokesman Sutopo Purwo Nugroho told a news conference that damage was "massive" in the north of Lombok, the Associated Press reports.

Some areas still hadn't been reached, with rescuers hampered by collapsed bridges, electricity blackouts and damaged roads blocked with debris.

Sutopo said the death toll had risen to 91 and more than 200 people were seriously injured. Thousands of homes and buildings were damaged and 20,000 people are in temporary shelters.

The quake, measured at a magnitude of 7.0 by Indonesian authorities and a still-powerful 6.9 by the U.S. Geological Survey, struck early Sunday evening at a depth of 10.5 kilometers (6 miles) in the northern part of Lombok.

"People panicked and scattered on the streets, and buildings and houses that had been damaged by the previous earthquake had become more damaged and collapsed," Sutopo said.

The quake triggered a tsunami warning and frightened people poured out of their homes to move to higher ground, particularly in North Lombok and Mataram, the capital of West Nusa Tenggara province. The warning was lifted on Sunday after only small waves were recorded.

Like Bali, Lombok is known for pristine beaches and mountains. Hotels and other buildings in both locations are not allowed to exceed the height of coconut trees.

Indonesia is prone to earthquakes because of its location on the Pacific "Ring of Fire," an arc of volcanoes and fault lines in the Pacific Basin. In December 2004, a massive magnitude 9.1 earthquake off Sumatra island triggered a tsunami that killed 230,000 people in a dozen countries.