Over 70,000 people have already evacuated the area as an eruption from the Mount Agung volcano seems imminent.
It's been more than 50 years since Agung's last eruption, which continued for nearly a year.
Mount Agung is at the left.
On Monday, the observation post at Mount Agung recorded 547 volcanic earthquakes, a figure which quadrupled from 119 quakes registered on September 22, which, together with other parameters, indicated that magma levels were likely to be ascending, reports Efe news.
"Chances of an eruption are high, but we can't say when", he said.
Indonesian authorities arranged makeshift shelters in town halls and school gymnasiums and set up tents in villages around the volcano to house thousands of evacuees.
"There will definitely be an impact on (sales of) tour packages but we don't know the figures yet", said Agustinus Pake Seko of PT Bayu Buana travel agency.
"We can meet their daily needs for the next few days", he said.
Sutopo said it was "natural" that people outside the immediate danger zone are leaving.
The volcano is one of the most active in the region's Ring of Fire seismic zone and experts predict it will erupt in coming days, prompting the government to take precautions to prevent a repeat of its last eruption in 1963 which killed 1,600 people.
Then, lava spewed 7.5 km (4.7 miles) while ash was hurled as high as 20 kilometres (12 miles) and blew as far as the Indonesian capital Jakarta some 1,000km (620 miles) away, to the west.
"This is the heaviest test in my live and hopefully it will end soon", said Ketut Suliasih, a Selat villager. "Otherwise, our farms would not be able to be planted again".
President Joko Widodo and First Lady Iriana Jokowi are scheduled on Tuesday (9/26/2017) to visit Mount Agung's evacuees in Bali Province and will hand over aids worth more than IDR7.1 billion. The island, famous for its beaches, surfing and elegant Hindu culture, had almost 5 million visitors previous year.
The mountain, 72 kilometers (45 miles) to the northeast of the tourist hotspot of Kuta, is among more than 120 active volcanoes in Indonesia.