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Natural Hazard
The threat of a negative event
Natural Disaster
is the negative impact following a natural hazard- in the event that it harms a community.
Risk Index
Is designed to help communities understand the risk level of their location and the impacts of a disaster.
Cause of an earthquake
The shifting of tectonic plates.
Convergent
The plate boundary with the most volcanoes. Can include oceanic-continental or continental-continental.
Transform
The plate boundary with no volcanoes. Two plates sliding past each other.
Divergent
The plate boundary with some volcanoes. Two plates pulling apart.
Japan: Earthquakes
Deepest earthquakes of all. Most frequent earthquakes. Least intense.
Iceland: Earthquakes
Somewhat frequent earthquakes. Shallowest earthquakes of all. Not very intense.
Haiti: Earthquakes
Least frequent earthquakes. Most intense of all.
Jakarta: Earthquakes
Somewhat frequent earthquakes. Not very intense.
Japan: Boundary
The boundary is oceanic-continental convergent.
Iceland: Boundary
The boundary is divergent.
Haiti: Boundary
The boundary is transform.
Jakarta: Boundary
The boundary is oceanic-continental convergent.
How many years does it take for volcanoes to form?
5 million
How quickly do tsunamis happen?
Right away
What are tsunamis caused by?
Volcanoes (in the ‘bove and underwater) creating shockwaves; convergent boundary plate slipping
Which directions do tsunamis go in?
2
At a convergent boundary, which plate goes underneath?
The more dense one.
How long do mountains take to form?
1 million years
Which natural disaster occurs at all boundary types.
Tsunami
What is the Mid-Atlantic Ridge’s boundary type?
Divergent
What is the average speed that plates move per year?
2 cm
Iceland: Volcanoes
Average of 1 or 2 a year. Some major
Haiti: Volcanoes
No volcanic eruptions
Jakarta: Volcanoes
At least 5 per year. Most are medium-intensity
Japan: Volcanoes
An average of 5 per year. Mostly minor, a few major.
Iceland: Volcanic Tsunamis
One every twenty years. Two major tsunamis in the last hundred years.
Haiti: Volcanic Tsunamis
Two in the last 125 years. Almost all are minor.
Jakarta: Volcanic Tsunamis
2-3 a year. Some major tsunamis.
Japan: Volcanic Tsunamis
Two per year over last 125 years. There are not as many major tsunamis.
