Volcanic Hazards - mount pinatubo Flashcards
What percentage of Filipinos live in povery?
Just over 35% live in poverty
How many islands is the Philippines made of and how many of them are inhabited?
There are over 7000 island with 1/3rd of them being inhabited
How many storms and typhoons does the Philippines experience annually ? And what is the yearly rainfall there ?
The country experiences 20 major storms with 3-4 typhoons yearly and there annual rain fall is between 1000mm to 4000mm
Geographically where does the Philippines lie ?
The country is located in the pacific ring of fire . It lies on top of a destructive plate margin where The Philippine sea plate is subdued beneath the Eurasia plate
What is the Pacific ring of fire ?
It is a ring of volcanoes around the Pacific Ocean which is resulted from the subduction of oceanic plates beneath lighter continental plates .
When was the last eruption of mount piñatubo before the 1991 eruption?
The last eruption was in 1380 and many of the aboriginal people living there believe it to be extinct .
When did pinatubo become active again ?
April of 1991, sending steam and hot ash into the atmosphere. This gave residents time to evacuate .
Where was the main eruption?
Between the 12th and 15th the volcano let off 3 large and 13 smaller eruptions , with pyroclastic flows travelling at 100kh. On the 15th a huge pilian eruption.
What happened with the main eruption?
The volcano sent out 11km3 of tephra and ash . Lava flowed into the main rivers on the island of Luzon and pumice landed over 60km away at the air base
How many people died as a direct result of the eruption?
6 people .
How much ash a rock was left on the slopes of the volcano ?
1 cubic mile
What were some of the affects of the ash ?
It destroyed all most all growing crops and collapsed over 150,000 home .
What did the ash and lava do to the water supplies ?
It contaminated it
Why was the ash on the slopes such a danger ?
As it mixed with the heavy rain water to create extremely dangerous fast travelling lahars.
By 1993 what had the lahars done ?
They had transported more than 3km cubed of ash and water down to the low lands , demolishing 100,000 homes . And doing more damage than the initial eruption.
