Thousands of houses were damaged, and most of the dead victims were hit by collapsed houses, Nugroho said.
The natural disaster was also felt in Bali and Indonesia, and prompted a tsunami warning for the region.
Last week, a magnitude 6.4 natural disaster struck off the coast of Lombok, killing 14 people. The island was already reeling from a magnitude 6.4 quake on July 29, which killed 16 people.
The United States Geological Survey slightly downgraded Sunday's quake after initially calling it 7.0-magnitude.
The most recent quake struck just nine miles deep and was felt in Denpasar, Bali, where buildings were damaged.
A tsunami warning was lifted after waves just 15 centimetres high were recorded in three villages, said the head of Indonesia's Meteorology, Climatology and Geophysics Agency, Dwikorita Karnawati. "Delegation thankfully safe though there i was told that there were casualties amongst other guests".
Donald Trump Attacks LeBron James And Don Lemon In Latest Twitter Rant
In a tweet sent shortly after the president's, the longtime CBS News anchor called Trump's comments "racist" and "dangerous". That campaign appearance probably turned the tide, as Trump didn't always feel so strongly against James.
An Australian tourist who felt the impact of the deadly Indonesian quake has described the scenes of panic and chaos as he and his partner attempted to find their way out of their Bali hotel. "The police officers there were kind", he said, adding that the airport was chaotic, with "lots of people".
Indonesia's Ministry of Tourism released a statement saying no tourists had been "injured or impacted" by the quake. He said the agency was still collecting data on the injured.
While officials have stated that numerous dead were from northern and western Lombok, it is likely there are more.
Landline phone and cellphone services were reported down in Tanjung, the Lombok town nearest to the epicenter.
"We went out into the yard, the ground was still shaking very badly", she told the ABC.
Famous for their picturesque beaches and mountains, buildings in Lombok and Bali height restrictions keep buildings from exceeding the height of coconut trees, the AP reports.
Indonesia, one of the most disaster-prone nations on earth, straddles the so-called Pacific "Ring of Fire", where tectonic plates collide and numerous world´s volcanic eruptions and earthquakes occur. The area stretches from Japan and Indonesia on one side of the Pacific Ocean all the way across to California on the other.