Flashcards in Earthquake Deck (24)
What is an earthquake
Vibrations that happen when built up stress is released and rocks slide past eachother under earths surface
What is an epicenter
The point on surface directly above earthquake
What is the focus ?
Point in earth where earthquake occurred
What is an aftershock
Smaller earthquakes that occur after a larger one in the same area
Side to side movements.
Move thought rock faster than any othe wave .
-up and down movements
Richter scale :
Measures energy released in an earthquake
What is an After effect?
Other problems that can occur and cause damage after an earthquake
Can S waves travel through liquid?
What happens to waves as they travel through different materials in the earth
The bend depending on the material they are passing through
Name and describe some after effects.
Fires: broken gas lines leak gas into the air
Tsunami: waves of water that get pushed up when earthquakes happen
Liquefaction: soil and rocks become loose from shaking and are inflated with water causing it to act like liquid.
Where do most earthquakes occur?
How many earthquakes can be felt each year by instruments?
What materials can P waves travel through?
Solids and liquids
What type of materials can S waves travel through?
What two factors impact the speed of waves?
Depth and rock type
How fast to P waves travel?
How fast do S waves travel?
3.5-7.5 km/ second
What type of waves show up first on a seismograph
How many seismographs are needed to find the location of an earthquake
What is magnitude
Total amount of energy released
What is the lowest magnitude a person can feel?
What is the magnitude of a strong earthquake