In the eastern Philippines, the Bulusan volcano erupted, raining ash on the city of Juban for the second time in a week.
The eruption on Sunday lasted 18 minutes, according to the Philippine earthquake agency.
Accordingly, the ash rain led to restricted visibility on the road and caused airlines to cancel a total of five connections.
There were initially no reports of injuries.
However, the earthquake authority increased the alarm level to level one of five.
"This outbreak could be followed by another one, we have to be careful with the Bulusan," said the head of the authority, Renato Solidum, on radio station DZBB.
Bulusan, located in the Philippine province of Sorsogon, erupted a week ago and ejected a kilometer-high ash cloud.
Tectonic plates collide
According to the civil protection agency in Juban, 366 people are currently in temporary shelters, most of whom were evacuated days before the latest tremors erupted.
The Bulusan erupted several times in 2016 and 2017.
The island state of the Philippines is regularly affected by volcanic eruptions.
As part of the so-called Pacific Ring of Fire, where tectonic plates collide, the country is regularly hit by earthquakes and volcanic eruptions.
At the end of March, thousands of people in the Philippines had to leave their homes after the Taal volcano south of the capital Manila erupted.