PEMENANG, Indonesia — When the earthquake struck off the coast of Lombok, Indonesia, three days ago, Lala Intan Komala lost her mother, her home and her livelihood.

Now, she and about 100 relatives have taken refuge in a large tent they built on a strip of land wedged between a peanut field and a banana grove. They have no idea how long they will be here or how they will rebuild their lives.

Help has been slow in coming.

“We lost our houses,” said Ms. Lala, 19. “We lost our jobs. And the aid is very minimal.”

The story of Ms. Lala and her clan is repeated across much of North Lombok, where the quake destroyed more than 42,000 structures and displaced about 156,000 people, officials said Wednesday, sharply increasing earlier estimates as data collection improved.