earthquakes Flashcards
what comes of the focus
shock waves and tremors
what sits directly about the focus
epicentre
where do shallow earthquakes occur
less then 70km below surface
where do intermediate earthquakes occur
70-300km below the surface
where do deep earthquakes occur
greater then 300 km below surface
what are primary waves
occur first
push the ground side to side
what are secondary waves
occur after primary waved
moves the ground up and down
what are surface waves
travel along the earths surface
what are used to measure earthquakes
modified mercalli scale
seismographs
richter scale
what does the siesmograph do
measures the earthquakes waved
what does the ritcher scale do
measures the magnitude of an earthquake
what does the mercalli scale do
measures the effects experienced and observed by people during the earthquake
what are the immediate of an earthquake
tsunamis death destruction fire loss of water supply homlessness
what is liquefaction
ground turns to liquid from intense shaking
what are long term effects of earthquakes
migration
disease
economic slowdown
