Events Before Eruption March 15 -small earthquakes April 2 -phreatic eruptions (water and magma interact producing violent explosions of steam and pulverized rocks) Volcanic activity increases throughout April and June (ashfall, sulfur dioxide emission)
June 3-14 – first magmatic eruptions occurred – Formation of a lava dome – eruptions caused tephra fall, lightning, and pyroclastic flows(4 km) –Evacuation of people started June 7th June 15 –main eruption
Pyroclastic flows reaching as far as 16 km Tephra fall reaching as far as Vietnam, Cambodia, and Malaysia Typhoon rains mixed with ash deposits making lahars The ash cloud covered 50,000 sq. miles Main Eruption June 15
Dormant for 635 years Second largest eruption of 20th century Had an effect on global weather (temp. dropped.9 degrees F) 10,000 were homeless 58,000 people were evacuated Total death toll:800 Notable Statistics
After main eruption Volcanic activity continued till 1992 Volcanic activity continued till 1992 Ash eruptions Ash eruptions 1992: 1992: Formation of Crater Lake Formation of Crater Lake Lava Dome grew in Caldera Lava Dome grew in Caldera Crater Lake partly drowned in 2001 Crater Lake partly drowned in 2001
Remains of a 2 by 3 mile caldera are still standing today Remains of a 2 by 3 mile caldera are still standing today Agriculture was destroyed by the pyroclastic flow and tephra Agriculture was destroyed by the pyroclastic flow and tephra
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