13. Mount Tambora: Unnoticed Volcanic Signs
In 1812, Mount Tambora began exhibiting signs of increased volcanic activity, including minor eruptions and seismic events. These early indicators were largely ignored, leading to the catastrophic eruption in April 1815. This eruption, the most powerful in recorded history, expelled approximately 41 km³ of magma, forming a 6-km-wide, 1,250-meter-deep caldera. The eruption caused an estimated 60,000 fatalities and had significant global climatic effects. (volcano.si.edu)
