HONG KONG — Thousands of travelers were left stranded Tuesday on the resort island of Bali as the eruption of the Mount Agung volcano forced the closing of the island’s international airport for another day.

Continuing tremors radiated from the volcano, an indication of potentially increasing danger, Indonesian officials and volcano experts said.

“Magma has been at the surface for a few days now,” Janine Krippner, a Pittsburgh-based volcanologist, said by email. “The risk now is the possibility of a larger eruption.”