earthquake zones

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earthquake zones
earthquake zones
What precaution should an urban area take if they are living in an earthquake zone?


i need help for a school asignment, i can't find anything about it?
thx

Here's a guide line from Carson City fire department.

http://www.carson-city.nv.us/index.aspx?page=349

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Earthquake Zones Most At Risk

Higher risk earthquake zones in mid plate?


I hate it when National Geographic Magazine contains a map with interesting information not explained on the map or within the accompanying article. Such in the recent April issue, vis a vis earthquakes. The map indicates larger mid-plate areas of higher occurance and risk for more major earthquakes include much of central and western Australia and surrounding the St Lawrence River Valley and smaller areas in west-central Africa, northeastern Brazil and a few other places, including of course the New Madrid area. Nothing in the article explains the geologic whys for these areas being comparatively more severe earthquake prone. Fortunately a couple of professional geologists' answers to other Yahoo Answers queries detail about the reasons for New Madrid (thank you) but what about the others, especially Austraila's and the St-Lawrence?

I think the answer to your question, that all of these places seem to have in common is: they are failed rift zones.

The New Madrid Fault is a failed rift zone, as is the Amadeus Basin in Australia. West-central Africa is the Great Rift Basin, connected to the Red Sea, which is one arm of that rift that is not a failed rift zone. Northeastern Brazil is another failed rift zone. The St. Lawrence River is another.

http://earthquakescanada.nrcan.gc.ca/zones/eastcan_e.php#LSLSZ

A rift zone is an area of the earth's crust that is being pulled apart by plate tectonic forces. In many instances these rift zones form a three-armed triple junction. As two of these arms dominate, the third arm becomes the failed rift arm. The New Madrid Fault zone is believed to be one of these failed rift arms from the rifting that separated South America from North America during the breakup of Rodinia. Actually the Rio Grande is a failed rift zone as well.

http://home.att.net/~sgeoveatch/rio_grande_rift.htm

The East African Rift Valley (the Great Rift Valley) is the failed arm where Africa is moving away from Asia and Saudi Arabia. Here is a USGS diagram of the Great Rift Basin in Africa:

http://pubs.usgs.gov/gip/dynamic/East_Africa.html

Australia's Amadeus basin is a failed rift that formed duing the breakup of Rodinia, an ancient supercontinent.

http://www.ga.gov.au/oceans/ea_Amadeus.jsp

Each of these rift arms represents a thinned and broken, faulted part of the continental crust that can be reactivated over time and will act as a weak point when either compressive or extensional plate tectonic forces are applied to a continent. Thus the likelihood of earthquakes.