Scientists are warning that one of the largest volcanos in the Western Hemisphere, Nevado del Ruiz, located just west of Bogotá, Columbia is showing signs of activity, the NY Post reports.

A large swarm of earthquake activity (11,600 on March 30) at the site has prompted Colombia’s Geological Survey to issue the second-highest, orange warning, about potential volcanic activity at the site. This has resulted in a call to evacuate 57,000 people living within the shadow of the volcano.

The last time Nevado del Ruiz erupted was on Nov 13, 1985, killing an estimated 23,000 people in the town of Armero in a matter of a couple of hours.

At the time, people were unaware of what was happening on the mountain as it was obscured by dark storm clouds. Most were killed by the massive mud and lava flows, referred to as lahars, that covered the town located near the base of the volcano.

READ: Deadliest volcano in Western Hemisphere shows signs of increased activity

Speaking about the coming Day of the Lord, the prophet Joel warned that it would be marked by increased volcanic activity.

The prophet refers to one of the classic signs of volcanic eruptions, columns of smoke. Notice that it is in the plural, suggesting there will be several volcanic eruptions and will be accompanied by fire and blood or death.

Joel also seems to indicate that the eruptions will cause so much ash to be pumped into the earth’s atmosphere that it will actually darken the sun.

I will display wonders in the sky and on the earth,
Blood, fire, and columns of smoke.
³¹ The sun will be turned into darkness,
And the moon into blood,
Before the great and awesome day of the Lord comes. (Joel 2:30-31 NASV)