Geological Catastrophes Final Studyguide

Geological Catastrophes Final Studyguide - Geological...

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Geological Catastrophes Final Studyguide Book notes 16/03/2008 21:12:00 CH. 1: NATURAL DISASTERS AND THE HUMAN POPULATION 2005, almost 100, 000 ppl lost lives to natural disasters biggest killers : earthquakes, tropical storms, floods, landslides 2 deadliest events over time:  hurricanes (tropical storms) and earthquakes * 2005, known economic losses were US$230 billion * trend: economic losses increase * Natural hazards exist in areas of obvious danger such as cities built on slopes of active  volcano or floodplains of rivers greater the magnitude, the less frequently it occurs larger disasters have longer return periods human responses to disaster suicides o 13.8% incr in 4 yrs following flood o 31% in 2 yrs after hurricane o 62.9% in year after earthquake o in whole US, incr by less than 1.3% during these intervals altruism o change from inward-directed concerns to outward-directed actions o sympathy and empathy tend to take over
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* human growth curve descr. Pop.  flat to gently inclined for ~160,000 yrs, then rises rapidly in last 3 centuries pop soared due to scientific-medical revolution and implementation of  principles of public health current pop around 6 billion pop heading for 7 bill in 2013 * growth curve is exponential more people beget more people doubling times o length of time needed for a pop to double in size o can be approx. by rule of 70: doubling time (in yrs) = (70)/ (% growth rate/ yr) demographic transition model: holds that economic wealth, combined with knowing that one’s children will  survive, leads to dramatic drops in birth rates wealthy countries some less developed countries experiencing drops due to urbanization and  more choices for women human pop projected to exceed 9 bill in 2050 CH 2: ENERGY FLOWS IN EARTH HISTORY AND NATURAL DISASTERS * flow of energy thru Earth’s land, ocean, and atmosphere has signif. Impact on  humans *disasters occur where Earth releases its concentrated energy
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main energy sources : impacts      with large asteroids and comets gravitational      contraction within earth, which heats up interior; gravitational  attractions btwn earth, moon, and sun that generate tidal energy earth’s interior      releasing heat  generated by ongoing decay of radioactive  elements in process of  nuclear fission the sun , where nuclear fusion produces radiant energy received by earth’s  exterior at rate 4,000 times greater than the heat flow from interior *formation of  earth massive amts of internal heat in early earth caused widespread melting
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This note was uploaded on 04/07/2008 for the course GEOL 20 taught by Professor Steidl during the Winter '08 term at UCSB.

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Geological Catastrophes Final Studyguide - Geological...

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