Popocatépetl volcano spews incandescent material on Tuesday. The second highest volcano in the Mexico increased its activity, and authorities raised the alert to the second-highest level. (Cristopher Rogel Blanquet/Getty Images)
Popocatépetl volcano just outside Mexico City has been erupting occasionally since 1994, but over the past week it has rumbled every day.
Scientists have recorded hundreds of explosions, and webcams trained on the volcano have shown it spewing incandescent material. From Mexico City, you can see a column of ash rising from the summit.
Smoke, ash and molten rock spew into the sky from Popocatépetl on Sunday, posing risks to aviation and communities below. Two Mexico City airports temporarily halted operations on Saturday due to falling ash. (Rafael Duran/AFP via Getty Images)Volcanic ash from the Popocatépetl volcano falls over Atlixco, Mexico, on Monday. Authorities are preparing for possible evacuation and telling people to stay out of a 7.5-mile radius around the peak. (Marco Ugarte/AP)
Like Mount Vesuvius in Italy and Mount St. Helens in Washington state, Popocatépetl is a stratovolcano capable of catastrophic, explosive eruptions, the last of which came around the year 800.
Scientists in Mexico say it's impossible to tell how long this new activity will last, or whether recent activity might lead to such a blast. But they say the 17,700-foot volcano, known locally as El Popo, will give enough warning to evacuate the millions who could be in danger.
Mexico has deployed about 7,000 troops to the region to help prepare for an evacuation if one is needed. More than 25 million people live within 60 miles of the peak.
Mexican soldiers drive in Santiago Xalitzintla on Tuesday as ash from the Popocatépetl volcano blankets the streets. (Marco Ugarte/AP)Mexican soldiers sweep ashes from the streets Tuesday in Santiago Xalitzintla. (Claudio Cruz/AFP via Getty Images)Women walk on the ash-covered streets Monday in Santiago Xalitzintla. (Marco Ugarte/AP)
