ENVIROHAZARD - EARTHQUAKES 14:12 Naturalsystems Geographicareas Society Culturalactivities &time TermsNaturalHazards,Disasters,catastrophes Define

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EARTHQUAKES 14:12 Geography- science that studies the relationship among: -Natural systems -Geographic areas -Society -Cultural activities Terms- “Natural Hazards”, “Disasters” , “catastrophes” Define: “Disasters” / “catastrophes”-  a natural process/event that leads to  “significant damage” (life, property, both) Where/Why? Physical Geo (Natural processes)- epicenter? Vs. Human Geo (social, eco, political, cultural)- reasons why they died?  From what  country? Natural Hazards: -Are all people on earth = susceptible to natural hazards? Pre-disaster planning Post- disaster response How might natural catastrophes be avoided/ mitigated? Hazards Mapping o Volcanoes o Fault lines/ earthquake zones
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o Flood zone mapping Do natural catastrophes occur at discreet intervals in time? What event can occur Settlement Patterns Mass Movement/ Mass Wasting  The Geo of New Orleans Physiography- elevation Proximity to Gulf of Mex Human/eco  Geo/ Demography Human Impact: o Channelization of Miss river o Sediment starvation o Wetland depletion o Nutrient loading o subsidence Miss Delta 1973-2003 Channelization of Miss river Sediment starvation
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Wetland depletion Nutrient loading Subsidence Geo of Tropical Cyclones Sea surface temps Cyclic vs. random events Larger events are much more rare Severity ” of a natural event depends on the metric Size of event on absolute scale- Richter, VEI Number of liver lost Economic damage o Geographic determinates of event “severity” o Geophysical process o Social/eco/pol o Demography/ pop density 8/31/10 “Time scales, frequency, recurrence intervals…… one year ago” magnitude - amount of energy released
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frequency - interval between occurrences 9/11/09- Fires Los Angeles- Why? extremely dry period- Mediterranean climate period --------- “Energy Sources of Natural Disasters” Sources of energy that results in natural hazards events: External –  extraterrestrial bodies, gravity, solar Internal-  most explained by plate tectonics, radioactive decay Natural hazards  events are generated when the Earth’s natural geophysical  processes result in concentrated energy and energy release There are 4 primary energy sources that fuel natural disasters: 1.  Impact of extraterrestrial bodies - rare, low frequency (interval), high  magnitude 2.  gravity : Gravity     = attraction between 2 objects. Ex. Landslides Tides     ( not a major risk)
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This note was uploaded on 11/29/2010 for the course GRG 334C taught by Professor Robertdull during the Fall '10 term at University of Texas at Austin.

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ENVIROHAZARD - EARTHQUAKES 14:12 Naturalsystems Geographicareas Society Culturalactivities &time TermsNaturalHazards,Disasters,catastrophes Define

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