There are around 1,500 known active volcanoes worldwide. A volcano is considered active if it has erupted in the last 10,000 years. Around 40 to 60 volcanoes erupt every year.

America’s deadliest volcano has just rattled through more than 1,000 tiny earthquakes in a matter of days, a drumbeat of tremors that has revived old fears about catastrophic mudflows racing down its ...

Mount Rainier’s seismic sensors showed unusual activity for several days, prompting widespread attention online, but experts told KIRO 7 News the readings came from a malfunctioning instrument rather ...