Volcano Type / Events
Colombia, S.America ... 13th November 1985
Destructive Plate Boundary - Nazca under S.American Plate
3:06pm - Ash and Pumice thrown from vents
7:00pm - Evacuation called off as Ash stopped falling
9:08pm - Lava erupts, Ash and Rock thrown in air, Heavy Rainfall, Pyroclastic Flow moves hot volcanic debris across snow glacier. This melts, and mixes with Ash to create Lahars. Lahars grew as they moved down the valley, picking up soil.
Lahars were REALLY thick and fast (50km/h). Noise created by Lahars was soo.. loud, it made houses and ground shake, and convo by shouting was impossible.
Effects / Facts & Figures
Blocked roads - Rescue Workers found it difficult to rescue survivors from mud.
Dirty Acidic water - un drinkable
Weeks later - bodies found in dry mud
Cattle was ill and weak - Inhaled ash and weight loss
5,000 Homes Destroyed
23,000 people killed
COST - US $7.7 billion (20% of countries GDP, at that time)
Responses / Signs of Eruption
Red Cross helped people and provided them with antibiotics and clean water. They also cleaned their wounds so they would not get infected and die.
Hospitals full - People had to wait 3 days - by then they were ill
Mobile field hospitals
SIGNS OF THE VOLCANO ERUPTING
Series of Earthquakes
Ash and Pumice thrown from vents