More than 55,000 locals have fled their homes and communities since a second explosion on Tuesday morning.
And a magnitude 7.9 earthquake struck the south-east of Chiniak, Alaska, on Tuesday, threatening to trigger a tsunami that was predicted to hit the entire US West Coast, Alaska and Canada.
The earthquake was initially measured at 8.2 on the Richter Scale but was downgraded by the US Geological Survey (USGS).
Territories on the Pacific Ring of Fire, where tectonic plates meet, see frequent seismic and volcanic activity.
The UN Office for Disaster Risk Reduction wrote in a tweet: “Pacific Ring of Fire active today. #switch2sendai #earthquake #volcano.
More than half of the world’s active volcanoes above sea level encircle the Pacific Ocean, and about 90 percent of the world’s earthquakes occur in this zone, according to the United States Geological Survey (USGS).
One man was killed and at least 11 people injured when the sudden eruption of Mount Kasatsu-Shirane in Japan rained down rocks on skiers at a mountain resort.
An avalanche soon after the eruption engulfed about a dozen skiers.
On Wednesday, a magnitude 6.2 earthquake stuck off the island of Honshu, not far from Hokkaido island.
Meanwhile, in the Indonesian capital of Java, office workers fled high-rise buildings after a strong earthquake of magnitude 6 shook the city.
The quake caused some injuries and damage to at least 130 building, but authorities ruled out the risk of tsunami.
Mount Agung in eastern Bali remains on alert for a major eruption.
Mount Sinabung, which suddenly became active in 2010, sent volcanic ash on villages and farmers’ crops in North Sumatra’s Karo regency in December last year.
In May 2017, an eruption from the mountain killed seven people, while a February 2014 eruption left 16 people dead.
The USGS weekly volcanic activity update on Jan 16 listed four ongoing eruptions in Asia – Suwanosejima in the Ryukyu Islands and Aira in Kyushu have both experience acitivity alongside Mayon and Agung.