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Nat. Disasters
Term | Definition |
---|---|
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 |