January Exam Flashcards
What is the focus of an earthquake?
The point where the earthquake starts
What is the epicentre of an earthquake?
Point on the ground directly above the focus
What is an earthquake?
A sudden or violent movement within the earths crust followed by a series of shocks
What is a seismic wave?
Energy released by an earthquake.
What is the Richter Scale?
The scale on which the strength of the earthquake is measured.
What is magnitude?
How strong an earthquake is
What is after-shock?
Smaller earthquake after the main, large one
What is the first stage of how an earthquake happens?
Earthquake occur at plate margins
What is the second stage of how an earthquake happens?
Margins
As the plates move past each other at the margins the movement is not smooth
What is the third stage of how an earthquake happens?
The plates sometimes lock, causing pressure to build up
What is the fourth stage of how an earthquake happens?
This pressure is suddenly released in a jerky movement
What is the fifth stage of how an earthquake happens?
RELEASE
This release of pressure is called an earthquake
What was the biggest earthquake recorded?
Chile
1960
9.5
How are earthquakes measured?
Using the moment magnitude scale.
0-10
What is the first impact of an earthquake?
Buildings destroyed or damaged
What is the second impact of an earthquake?
GROUND
Soil liquefaction- ground turning to quicksand
What is the third impact of an earthquake?
SPARKES
Fires - electricity cables and gas have sparked
What is the forth impact of an earthquake?
Tsunami
What is the fifth impact of an earthquake?
Landslides
How can we reduce the impact of earthquakes?
Drop, cover, hold on
Aseismic (base-isolated), building design
Pendulums
What is the capital of Haiti
Port - au - Prince