JAKARTA—Indonesia’s volcanology agency is sending a team of researchers to the Mount Semeru volcano to identify areas too dangerous for villagers to stay after it erupted on Saturday, killing dozens of people on the slopes of Java island’s highest mountain. In the days since the disaster, questions have been raised about the effectiveness of the disaster warning system and whether some villages should be moved. Ediar Usman, an official from the Center for Volcanology and Geological Hazard Mitigation (PVMBG), told a media briefing that some areas were potentially no longer safe to inhabit. “It’s not impossible that a similar disaster could happen in the future,” he said. Eko Budi Lelono, who heads the geological survey center, told Reuters the team would be sent this week and included experts from Yogyakarta who had studied the Merapi volcano near that city. An estimated 8.6 million people in Indonesia live within 10 km …