PC Nevada del Ruiz Flashcards
What type of volcano was nevada del ruiz?
composite
Where is nevada del ruiz?
Colombia in the northern andes
When was the eruption of NDR?
13th november 1985
Define the term lahar?
A landslide or mudflow of volcanic fragments
Define the the term lava?
Molten rock that reaches the earths surface through a volcano
Which plates are involved in the eruption?
Nazca Plate and the South American Plate
Which plate subducted under the other?
The Nazca
Why did the Nazca plate subduct?
Because it is a denser oceanic Crust
Which way were the 2 plates moving
the nazca was moving in an easterly direction and the south american in a westerly direction
Explain what happended after the nazca subducted?
The nazca plate subducted to about 200km and the pressure built up and at that point caused the crust to melt and form magma. it then was forced to the surface through a weak point (the volcano) and exploded through the top as ash and lava.
What did the lahar do?
The lahar was formed by the meltrd snow, ash and sulfur . It came down the volcano and was travelling 50km per hour. This is what destroyed the town.
How many people died in the eruption?
22,000
how deep was the lahar?
30 metres
Which towm was most effected by the eruption?
Amero
What caused the snow to melt?
The lava melted it
Describe where the town of amero is in relation to NDR?
50km from the volcano inthe bottom of a valley
What is a composite volcano?
A volcano layered with ash and lava
How high was the ash cloud?
8 km high
How long did it take the lahar to destroy Amero?
20 mins
What was the problem with it erupting at 1.09am
People were asleep and unprepared
