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Nat. Disasters

process physical, chemical and biological ways in which events affect earth's surface
tectonic plates large surface blocks of solid earth
what are wind circulation and water evaporation responsible for? forming climactic zones
natural hazard natural process and event that potentially threatens human life
disaster hazardous events occurring over a limited time span within a defined area
What 4 aspects are necessary to consider a natural hazard a disaster? more than 10 people died, more than 100 affected, state of emergency called, international help needed
natural catastrophe massive disaster requiring lots of money and a long time for recovery
largest number of deaths are caused by what natural hazard? Tornadoes and windstorms
how much does a single natural disaster cost? $500 million
atmosphere the layer of gasses surrounding earth
lithosphere earth's rocky outer layer
hydrosphere the layer of water
biosphere where life exists
environmental unity one action causes others in a chain of events
What are the 5 steps of prediction? 1. Location-delineated by mapping where occurred b4 2. Probability of Occurrence-determining probability of an event occurring at a particular location at a particular time span 3. Precursor events 4.Forecasting and Prediction 5.warning
what are the 5 types of hazards? geologic hazards, hydrological hazards, climactic hazards, health & disease hazards, space hazards
what are some examples of geologic hazards? tsunamis, landslides, volcanic eruptions
what are some examples of hydrological hazards? floods, erosion
what are some examples of climactic hazards? snowfall, hurricanes, hail, heat, tornadoes, drought
what are some examples of health & disease hazards? pollution, bubonic plague, potato famine
what are some examples of space hazards? solar radiation, meteorites, aliens
what I a fault? a fracture along which 1 plate has moved relative to another
risk the probability of a hazard occurring times the casualties it may cause
What parts are important in risk assessments? exposure-how likely to experience vulnerability-how prepared location-distance to disaster hazard-what type of hazard
seismology the study of elastic waves that travel through the earth
what are the 2 main types of waves? compression (p) and shear (s)
what are compression waves? waves that travel by squeezing/expanding medium they travel through. They can travel through solids and liquids.
what are shear waves? waves that travel by shearing medium they pass through. They only pass through solids.
what are the 3 types of plate boundaries? convergent, divergent, transform
what is continental drift? the idea of pangea by Alfred wegener
every how many years do magnetic field lines on earth change? every 100,000 years
how does one determine plate velocities? hotspot tracking, ocean floor magnetic strips, oldest parts in outside of center
what is the easiest way heat can escape? convection
force a property or action that changes or tends to change the state of rest or velocity
what is the equation of force? F=mass*acceleration
stress application of force
what do divergent plates create? create new lithosphere
when it comes to stress, what are earthquakes a result of? stress that builds until overcomes friction
earthquake a build up and release of stress due to tectonic plate interactions
which wave is faster? p waves
surface rupture amount of slip of fault
frequency number of waves passing a reference point per second
period number of seconds between successive peaks
amplitude measure of ground motion
r wave the surface wave in rolling motion
what are the 2 types of surface waves? love and rayleigh
what is the moment magnitude scale? showing the equivalence of richter scale to explosives
liquefaction when put water into unconsolidated material, it behaves like a liquid
primary effects of earthquakes ground shaking, ground rupture, loss of life, collapse of infrastructure, landslides, liquefaction, tsunamis
secondary effects of earthquakes fires, floods, disease
tsunami wave where ocean moves on land
Created by: VaLeRiA!