Points Earned:1/1Your Response:B 10. Bigger earthquakes occur less frequently, but a bigger quake releases more energy and does more damage. An interesting question to ask about earthquakes (and about almost anything else!) is whether the increase in energy release and damage done is larger or smaller than the decrease in frequency as one looks at bigger earthquakes. Asked a different way, is most of the damage done by the many little earthquakes or by the few big
earthquakes? A.Most of the damage is done by the many, little earthquakes.B.Earthquakes only damage Coke machines, under an exclusive contract with Pepsi.C.Most of the damage is done by the few, big earthquakes.D.The drop-off in frequency just balances the rise in energy, so all earthquake sizes contribute equally to global earthquake damages.E.Earthquakes don’t do any damage, so this is a silly question.An increase of 1 in magnitude increases ground shaking about 10-fold, increases energy release about 30-fold, and decreases frequency about 10-fold; the 30-fold increase in energy more than offsets the 10-fold decrease in frequency of occurrence. We wish earthquakes did no damage, but the millions of people who have been killed in earthquakes over the centuries would, if they could, testify to the damage done by earthquakes. And earthquakes are actually very poor at distinguishing the brands of soda dispensed by or advertised on machines.Points Earned:1/1Your Response:C 11.It would be really nice to know whether an earthquake is coming, so we could prepare for it.At this time, we are able to: By keeping track of where earthquakes happen, combing written and oral histories of past earthquakes, looking at geological deposits to see where shaking has occurred and broken rocks or tree roots or caused sand boils, and measuring where rocks are moving and where they aren’t, good
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- Fall '08
- Earthquakes, rocks, Outer core, Death Valley