Write a 4 line response to this … …. Earthquakes don ’ t kill people, buildings do!!!. AGREE OR DISGAREE?. Learning Objectives: To understand the features of an earthquake. To appreciate the differences in earthquake impacts around the world.
AGREE OR DISGAREE?
To understand the features of an earthquake.
To appreciate the differences in earthquake impacts around the world.
To understand how people can prepare for earthquakes.
Approximately 12 million
earthquakes occur around
Only about 100 of these
Have a significant impact
Epicentre Seismic waves Fault /boundary Crust Focus
The effects of earthquakes can be divided into 2 categories:
Diseases can spread very quickly in the unsanitary conditions often left behind by massive earthquakes. Water becomes contaminated very quickly, and in Less Economically Developed Countries (LEDC's) especially; access for the medical services can be badly hampered by the damage caused by the quake.
Roads and bridges being destroyed and railway lines being buckled.
Fires: usually from ruptured gas lines. This was the main cause of death and damage after the San Francisco earthquake in 1906.
Tidal waves: A tidal waves caused by an earthquake is called a tsunami. They can travel very quickly across entire oceans, before engulfing land 1000's of miles away.
Landslides can often be triggered by earthquakes, causing huge amounts of material to be moved very quickly. This is actually what occurred just before the volcanic eruption on Mt. St. Helens. They are most likely to occur where the land is steep, saturated or weak.
Not all earthquakes are the same! /boundary Crust Focus
Big town causes…”
Good response team causes…”
Basic response team
Depth of earthquake
(a shallow focus will cause more damage)
Factors affecting damage caused by earthquakes
Strength of buildings
Time of day
(STICK IN COPY OF THE RICHTER SCALE)
The Three P’s Policy causes…”
There may be many pre-shocks before an earthquake that can be measured on a seismograph.
Animals often act strangely for examples dogs will howl before an earthquake.
All buildings must comply with strict earthquake planning regulations.
Existing buildings, roads and bridges should be strengthened.
Prepare disaster plans.
Organise and prepare hospitals and evacuation centres.
Organise emergency supplies.