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Global Hazard Patterns

The three main geophysical hazards are earthquakes, volcanoes and tsunamis.


Earthquakes:
Main earthquake zones are clustered along plate boundaries.

Our earth crust is divided into seven major sections or plates, and a number of smaller ones. Some
are oceanic and some are continental. The plates float on…

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Conservative boundary: a boundary between plate where the movement of the plates is parallel to
the plate margin and the plates slide past each other. Produces frequent, shallow earthquakes,
sometimes of high magnitude.

Constructive boundary: a boundary between plates where the plates are diverging or moving apart.
Associated with large…

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Snow avalanches:

Concentrated in high mountainous areas

Suggestions that global warming may be increasing avalanche occurrences


The distribution of hydro-meteorological hazards
Widespread in distribution, growing in frequency and increasingly unpredictable in their
location.

Drought:

Over one third of the world's land surface has some level of drought exposure. This includes…

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Flooding hazards: deaths by drowning and disease, destruction of food crops and
infrastructure and loss of homes. In developed countries it disrupts transport and
infrastructure, damages livelihoods and created high insurance costs.

Storms

Include tropical cyclones, mid-latitude storms and tornados.

o Tropical cyclones are violent storms between 200 and 700…

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The Philippines-disaster
The group of island in the Pacific Ocean are located in a natural disaster hotspot, characterised by a
high vulnerability to natural hazards.

On average, the islands have 19 to 21 cyclones every year.

Cyclonic activity not only exposes the nation to intense rainfall and strong winds, it…

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