Mount Marapi erupted Tuesday, sending ash over parts of Agam Regency and prompting officials to warn residents to avoid a 3 km radius.

Indonesia's Mount Semeru volcano erupted Wednesday afternoon around 4:00 p.m. local time, sending ash more than 6,500 feet into the air, according to data from the country's Center for Volcanology.

Watch the chilling videos as Mount Semeru erupts in a powerful volcano blast in Indonesia, sending ash clouds skyward and forcing hundreds to evacuate as officials raise the alert to its highest level.

Indonesian authorities say they are helping more than 170 climbers caught by Mount Semeru’s sudden eruption to return to safety.

Nearly 1,000 residents were evacuated from nearby villages around Mount Semeru in Indonesia's East Java province after the volcano eruption, while 178 climbers who had become stranded were rescued.

JAKARTA, Indonesia (AP) — Indonesian authorities raised the alert for Mount Semeru volcano to the highest level on Wednesday after a series of eruptions prompted evacuations. The volcano is the highest peak on Java, the most densely populated island in Indonesia.

No, there is not increased activity at Mount Rainier, despite a national headline Wednesday morning claiming there is an uptick in seismic activity.

Contrary to popular belief, it’s not the big-name volcanoes like Yellowstone and Mount Etna in Sicily that pose the greatest threat. A UK volcanologist argued that the biggest danger could come from hidden volcanoes that appear dormant and are barely monitored.

Experts clarified that Mount Rainier was not at risk of eruption after widespread online speculation spread. A “technical issue” of one seismometer produced a faulty reading, Harold Tobin, director of the Pacific Northwest Seismic Network, said.

The Hidden Climate Power of Sulfur Dioxide When massive volcanic eruptions occur, they inject millions of tons of sulfur dioxide into the stratosphere, where it forms sulfate aerosols that scatter incoming solar radiation and result in global surface cooling.

A Daily Mail article told of sudden seismic activity and "unprecedented 72-hour tremor phase" at Mount Rainier. They were woefully wrong, scientists say.