Unit 2- Natural Hazards Flashcards
(34 cards)
Secondary effects
Those that result from the primary
Primary effects
Those resulting directly from the event itself
Tsunamis
Large ocean waves caused by an underwater earthquake
Richter scale
A measure of earthquake strength
Aftershocks
Smaller tremors occurring after an earthquake
Earths crust
The solid, outer layer of the earth
Tectonic plates
Large segments of the earth
Mantle
The layer of the earth between the crust and the core
Magma
Liquid rock below the earths surface
Liquefaction
The loss of strength that can occur in the ground during earthquake shaking
Retrofitting
The addition of new technology to older buildings
Appropriate technology
Technology designed with consideration of the community it is intended for
Epicentre
The point on the earths surface directly above the focus of an earthquake
Building code
Regulations which state how a building should be constructed in order for it to be safe
Seismic activity
Movements in the earths crust
Laser ranging
Using laser beams and mirrors to detect minute changes in the shape of the land
Evacuation
Movement of people away from a place of danger to a place of safety
Storm surges
Abnormal rise of the sea along a shore as a result of a storm ;sometimes called a tidal surge
Tropical
Situated in the area between the tropics of Cancer and Capricorn
Eye
The calm ,clear area at the centre of the tropical storm
Track
The path taken by a tropical storm
Mandatory evacuation
An evacuation that is commanded by the authorities
Natural cycle
Series of events in nature that are repeated over and over again
El Niño
A warming of the ocean surface off the western coast of South America
