Scientists at the Alaska Volcano Observatory (AVO) reported Tuesday a major explosion that rocked the Cleveland Volcano.

The scientists said that the explosion likely produced an ash cloud but that it stayed below 20,000 feet and was not a threat to commercial aircraft.

“We see this quite often and we think that they are associated with some sort of ash production,” U.S. Geological Survey geologist Kristi Wallace said.

The AVO recorded a similar explosion from the Ring of Fire placed volcano last November.

The Cleveland Volcano forms the western part of Chuginadak Island and is about 940 miles southwest of Anchorage, Alaska.

The volcano has been seismically active over the last 14 years, with occasional lava flows and small ash clouds that stay below the 20,000 foot level of concern by the Federal Aviation Administration.