Volcanoes

adjustment to and perception of the volcanic hazard

Primary adjustment to volcanic activity = evacuation

volcanic evacuation at the Argentina during 3 June 2013

Resources:here

People live near volcanoes for a variety of reasons:

1)They were born there

2)the land is fertile and good for farming

3)people are optimistic and believe an eruption is unlikely

4)they do not have any choice as to where they live

Perception evaluated volcanic activity:

person's age and length of residence near a volcanic hazard are significant factors in a person's knowledge of volcanic activity and possible adjustment.

The evacuation of 60000 people before 1991 eruption of Mt.Pinatubo was successful because the government had provided a program to educate people concerning the dangers from violent ash eruptions with debris flow.

Introduction to Volcanoes

How come volcanic activity formed? =)

Volcanic activity directly related to plate tectonics,most volcanoes being located near plate boundaries.

This relationship exists because spreading or sinking lithospheric plates at plate boundaries interact with other earth materials to produce molten rock,called,magma within the earth or lava when it erupts into the surface.

Pacific Ring of fire

Magma Formation Magma is generated primarily within the asthenosphere decompression melting occurs when the overburden pressure athenosphere rocks is decreased by thinning of the overlying lithospheric plate causing of superheated rocks decompression melting also occurs when superheated rocks upwell from deep within the athenosphere as part of the hot spot. melting at subduction zone due to addition of volatiles to the athenosphere released from the downgoing oceanic plate. melting of the lithosphere due to the addition of heat carried by rising magma For magma itself, it has its own properties : Viscosity Volatile content and eruptive behavior