1. Tom Demmer, Megan Hurley, Sarah Noble
Krakatoa: 1883
Tom Demmer, Megan Hurley, Sarah Noble

2. Volcanic Eruptions
Occur near destructive margins between tectonic plates
Eruptions spew lava (called magma while inside) and ash
Lava and ash may be deadly to those on slopes and in valleys surrounding the mountain

3. Krakatoa Volcanic mountain Indonesian island of Rakata
Elevation: 2,667 feet
Famous eruption occurred in 1883
Eruption began on June 19, 1883
Pre- and post-eruption events went on for months
Eruption destroyed two-thirds of the island
Eruption created the loudest sound ever observed by mankind

4. During the Eruption
Occurred on the morning of May 20, 1883 in Indonesia when the ash started to rise
For 2 months there were small eruptions
August was when the largest explosion in historical time occurred
Last day, northern 2/3 of the island collapsed

5. During the Eruption
Largest explosion, heard as far as Perth in Australia
Six cubic miles of rock, ash, and pumice
It was so big that debris scattered as far as Madagascar
Ash caused the formation of other islands

6. Location and why it happened
130 active volcanoes on Indonesia
Arc system created by subduction
Active volcano in the Sundra straits
Krakatoa’s location makes it highly explosive

7. Results of Krakatoa Tsunamis: Deadly Debris:
Only 1/3 of Krakatoa remained above sea level after the eruption
Wave up to 40 feet tall
Responsible for about 90% of casualties
Deadly Debris:
Falling tephra and hot protoclastic flows
About 2,000 casualties sufferd severe burns

8. Results of Krakatoa Atmosphere: Anak:
Fine fragments of tephra pulled into stratosphere
Decrease in temperature and exotic sky colors
Anak:
“Child of Krakatoa”

9. Results of Krakatoa At least 36,417 casualties
165 coastal villages destroyed

10. References