"We estimate there are still more victims because we found many sandals in front of the mosque", Nugroho said Tuesday.
But with not enough boats to evacuate tourists quickly and too few planes to fly them out of Lombok, many visitors were forced to wait for hours or camp on beaches and the floor of the worldwide airport in Mataram.
Overnight to Tuesday, two more strong after shocks of 5.4 and 5.5 hit Lombok, with each lasting around 10 seconds.
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Around 1,477 people have been severely injured in the latest quake, with tens of thousands of homes damaged, and authorities have appealed for more medical personnel and basic supplies.
Some 900 tourists were being evacuated from Indonesia's tiny Gili Islands after a powerful quake struck Lombok, killing over 90 people and injuring hundreds.
Michelle Thompson, an American holidaying on one of the Gilis, described a scramble to get on boats leaving for the main island during which her husband was injured.
Many farmers were reluctant to move far from their damaged homes and leave precious livestock behind, he added.
The scuba instructors, known as Fee and OJ by friends and locals, evacuated the island and headed to Bali yesterday after a magnitude 7.0 quake struck Lombok island on Sunday night.
Todd, from Northbridge, told Fairfax Media at Lombok airport that he and his wife had spent a night sleeping in a carpark after the natural disaster hit.More news: Malaysia's former PM Najib charged with three counts of money laundering
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"There has been no help at all here", said 36-year-old Multazam, staying with hundreds of others under tarpaulins on a dry paddy field outside West Pemenang village.
The tremors in Lombok on Sunday came just one week after a powerful 6.4-magnitude quake struck the popular Indonesian tourist destination, killing 16 people and injuring at least 162.
Disaster officials did not say how many people they believed were buried beneath the ruins of the mosque but the village head, Budhiawan, said it was about 30, based on unclaimed belongings left outside.
Videos showed screaming people running in panic from a shopping mall and a neighborhood in Bali where parked vehicles swayed.
Oxfam's local project manager in Lombok, Meili Narti, said there needed to better coordination of aid efforts between the government and the military.
While many tourists are flooding Indonesia's ferry terminals and airports in the hopes of finding a way back home, Montgomery-Lay and her husband are concerned about the effect it would have on their daughter, who has cancer.
Indonesia is prone to earthquakes because of its location on the "Ring of Fire", an arc of volcanoes and fault lines in the Pacific Basin. In 2004, the Indian Ocean tsunami killed 226,000 people in 13 countries, including more than 120,000 in Indonesia.
There had been a half-hour evacuation at the Lombok airport following the quake because the electricity went off.