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Re: Advice and a New Paper


I do wonder what a world full of six to eighty ton animals thumping around would really sound like. I know if one were coming down the hall, I'd sure hear it! And feel it!

http://www.pitt.edu/~poole/DinosaursProject/lesson5text.htm I wasn't googling dinosaur earth shook, I was trying to learn how much big dinosaurs weighed. I really didn't expect to learn that brontosaurus weighed up to 80,000 pounds, is that an exaggeratino? Especially since it says this is only the weight of ten full grown elephants, implying that an adult elephant weighs three or four tons. This leads me to wonder if it's a mistake. I think elepants do weigh over a ton. But some dinosaurs were a good deal bigger. Tyrannosaurus could be up to six tons, and it wasn't the biggest therapod. (Behind me, four very small therapods are going, HUH?)

This is the supposed dope on elephants. "The African elephant can be distinguished by its larger size and broader ears that drape over its shoulders. Males, or bulls, may reach 4 m (13 ft) in height and weigh 7000 kg (15,400 lb). Females, or cows, are shorter, averaging 2.8 m (9 ft) in height, and weigh considerably less, about 3600 kg (7900 lb).Asian elephants are shorter and stockier than their African relatives, with ears that do not reach their shoulders. The average Asian bull stands 3 m (10 ft) tall and weighs 2300 kg (5100 lb), about half the weight of male African elephants. Cows reach an average height of 2.4 m (7.8 ft) and weigh an average of 3000 kg (6600 lb)." (http://www.answerbag.com/q_view/21741) So I guess an elephant weighs a ton and a half to seven tons.

According to http://www.enchantedlearning.com/subjects/dinosaurs/questions/QnsDinoSpecies.shtml, brachiosaurus weighed the same. No, not quite. Brachiosaurus weighed 80,000 TONS. Not 80,000 pounds. Now, I'm really finding that hard to believe. http://www.enchantedlearning.com/subjects/dinosaurs/dinos/Brachiosaurus.shtml

http://www.buzzle.com/articles/facts-about-brontosaurus-dinosaur.html This one says bronchosaurs weighed 24 to 30 tons.

I wonder if maybe the poster meant to say that earth vibrations aren't sound? Now, I wouldn't make that sharp a distinction. Surely if you could hear them thumping around, you'd also feel them? Now, earthquakes seem a bit of an exaggeration, but on the other hand, there sure were enough violent geological events when dinosaurs were around, LOL!

By contrast, "Locomotives weigh anywhere from 120 to 240 tons each, depending on the size. Mainline units are the heaviest, switcher units and yard engines are the lightest.

"Rail cars can weigh anywhere from 30 tons (empty) to 140 tons (loaded) each. Special cars designed to carry extra heavy loads can weigh well in excess of 200 ton" (http://answers.yahoo.com/question/index?qid=20061007151346AAWdaRL)

Now, you can hear and FEEL them things coming - and they don't even walk!

Dora Smith
Austin, TX

----- Original Message ----- From: "Mickey Rowe;893-2446" <mrowe@lifesci.ucsb.edu>
To: <dinosaur@usc.edu>
Sent: Thursday, October 15, 2009 9:29 AM
Subject: Advice and a New Paper

If I might...  If you're going to be snippy, especially in public, you
should be extra cautious about the things you're asserting as facts.
For instance, it's not a good idea to state:

 I have not actually been talking about _sounds_, nor apparently was
 the person you initially responded to when you brought up "earth
 shaking," "earthquakes," etc.

when trying to end a thread that effectively began:

] It would be amazing to see one of these animals alive.  I wonder
] what the sound was like when they walked by on earth

and the initial response to the earth shaking message included:

} Well, I wasn't expecting a huge thumping noise but a four-foot wide or
} wider foot coming down in scrub foilage had to be a bit noisy

Of course I suspect everyone here is familiar with the Jurassic Park
scene showing the vibrations in the cup as the tyrannosaur was walking
some tens of meters away.  Great drama.  Horrible science (as Nick
implied).  Yes, sound would propagate through the ground, and as
Martin indicated with his story about the wood, it would propagate
better than through air.  But the water in Ian Malcolm (Jeff
Goldblum)'s cup wouldn't be noticeably disturbed nor would he hear a
sound like someone pounding on drums.  And it's more than a little
unlikely that you'd hear much from sauropods walking by.  But speaking
of smacking thingss...