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#21
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Earthquake this morning!
Back to the question "Are buildings in earthquake zones built
differently" the answer is YES! We have very strict building codes here; the buildings that collapsed in Niigata were mostly over 50 years old. (Of course, any building will tip or break down if shaken too hard-- or if there's a fault right under it!) The building code in Tokyo went into effect in the 1970's. I'm not sure what all is involved, but concrete structures are reinforced by flexible steel rods running through the concrete, which are supposed to make the building sway with the "flow" of the earthquake rather than bending, and they sway in an S shape, direction depending on the direction and sound frequency (Hertz) of the quake. Wooden structures already do this, but the S-bend that the earthquake produces in some houses (which are not tall enough to do the whole S) will collapse the first floor. So in a two-story house, you're actually safer on the second floor, which is why most of our houses have bedrooms on the second floor. Cantate |
#23
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Earthquake this morning!
wrote:
jmcquown wrote: wrote: jmcquown wrote: Reelfoot Lake was formed by a quake here in 1912. It's a BIG lake. Legend has it the ground shook so hard the Mississippi river ran backwards. That sounds very poetic! I wouldn't know about the quake of 1912 Eagles nest at Reelfoot Lake. I totally don't understand this response. scratching head Joyce Um... I wasn't alive in 1912? |
#24
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Earthquake this morning!
On Jul 21, 8:19 pm, "jmcquown" wrote:
wrote: jmcquown wrote: wrote: jmcquown wrote: Reelfoot Lake was formed by a quake here in 1912. It's a BIG lake. Legend has it the ground shook so hard the Mississippi river ran backwards. That sounds very poetic! I wouldn't know about the quake of 1912 Eagles nest at Reelfoot Lake. I totally don't understand this response. scratching head Joyce Um... I wasn't alive in 1912?- Hide quoted text - - Show quoted text - Er..that part was obvious. I kept looking for some reference to "Eagles Nest". Were we supposed to know what that means, or did I miss something? |
#25
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Earthquake this morning!
"Cantate" wrote in message
oups.com... Back to the question "Are buildings in earthquake zones built differently" the answer is YES! We have very strict building codes here; the buildings that collapsed in Niigata were mostly over 50 years old. (Of course, any building will tip or break down if shaken too hard-- or if there's a fault right under it!) The building code in Tokyo went into effect in the 1970's. I'm not sure what all is involved, but concrete structures are reinforced by flexible steel rods running through the concrete, which are supposed to make the building sway with the "flow" of the earthquake rather than bending, and they sway in an S shape, direction depending on the direction and sound frequency (Hertz) of the quake. Wooden structures already do this, but the S-bend that the earthquake produces in some houses (which are not tall enough to do the whole S) will collapse the first floor. So in a two-story house, you're actually safer on the second floor, which is why most of our houses have bedrooms on the second floor. Cantate When I went to Australia for the first time, I was amazed at all the brick buildings I saw in Sydney. There are virtually no brick buildings in Southern California, unless they are very old. This is because of building regulations to make buildings earthquake-safe. My Dad described the aftermath of the Long Beach quake of 1933 this way: "The stucco buildings had cracked plaster; the wood frame buildings had slid off their foundations; the brick buildings were nothing but a pile of bricks." Joy |
#26
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Earthquake this morning!
Sherry wrote:
On Jul 21, 8:19 pm, "jmcquown" wrote: wrote: jmcquown wrote: wrote: jmcquown wrote: Reelfoot Lake was formed by a quake here in 1912. It's a BIG lake. Legend has it the ground shook so hard the Mississippi river ran backwards. That sounds very poetic! I wouldn't know about the quake of 1912 Eagles nest at Reelfoot Lake. I totally don't understand this response. scratching head Joyce Um... I wasn't alive in 1912?- Hide quoted text - - Show quoted text - Er..that part was obvious. I kept looking for some reference to "Eagles Nest". Were we supposed to know what that means, or did I miss something? Birds... Eagles nest in the woods around Reelfoot Sorry, I thought it was apparently I'm a bird watcher |
#27
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Earthquake this morning!
On Jul 21, 9:18 pm, "jmcquown" wrote:
Sherry wrote: On Jul 21, 8:19 pm, "jmcquown" wrote: wrote: jmcquown wrote: wrote: jmcquown wrote: Reelfoot Lake was formed by a quake here in 1912. It's a BIG lake. Legend has it the ground shook so hard the Mississippi river ran backwards. That sounds very poetic! I wouldn't know about the quake of 1912 Eagles nest at Reelfoot Lake. I totally don't understand this response. scratching head Joyce Um... I wasn't alive in 1912?- Hide quoted text - - Show quoted text - Er..that part was obvious. I kept looking for some reference to "Eagles Nest". Were we supposed to know what that means, or did I miss something? Birds... Eagles nest in the woods around Reelfoot Sorry, I thought it was apparently I'm a bird watcher- Hide quoted text - - Show quoted text - Actually, I didn't know you ever went on birdwatching excursions. I just knew you had a bird. Sherry |
#28
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Earthquake this morning!
"Cantate" wrote in message oups.com... Back to the question "Are buildings in earthquake zones built differently" the answer is YES! We have very strict building codes here; the buildings that collapsed in Niigata were mostly over 50 years old. (Of course, any building will tip or break down if shaken too hard-- or if there's a fault right under it!) The building code in Tokyo went into effect in the 1970's. I'm not sure what all is involved, but concrete structures are reinforced by flexible steel rods running through the concrete, which are supposed to make the building sway with the "flow" of the earthquake rather than bending, and they sway in an S shape, direction depending on the direction and sound frequency (Hertz) of the quake. Wooden structures already do this, but the S-bend that the earthquake produces in some houses (which are not tall enough to do the whole S) will collapse the first floor. So in a two-story house, you're actually safer on the second floor, which is why most of our houses have bedrooms on the second floor. Cantate When we lived in Anchorage AK in 1970, there was a new hotel built to earthquake standards, and the bar was on the top floor. Some loved it and some were scared spitless of it, but it swayed with every little earth tremor. Anchorage got lots of minor quakes while we lived there. They usually came from the same direction, south east, and they sounded like a jet coming in for a landing, only the flight path wasn't in that direction. You could always hear them coming before you felt them. Jo |
#29
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Earthquake this morning!
Sherry wrote:
On Jul 21, 9:18 pm, "jmcquown" wrote: Sherry wrote: On Jul 21, 8:19 pm, "jmcquown" wrote: wrote: jmcquown wrote: wrote: jmcquown wrote: Reelfoot Lake was formed by a quake here in 1912. It's a BIG lake. Legend has it the ground shook so hard the Mississippi river ran backwards. That sounds very poetic! I wouldn't know about the quake of 1912 Eagles nest at Reelfoot Lake. I totally don't understand this response. scratching head Joyce Um... I wasn't alive in 1912?- Hide quoted text - - Show quoted text - Er..that part was obvious. I kept looking for some reference to "Eagles Nest". Were we supposed to know what that means, or did I miss something? Birds... Eagles nest in the woods around Reelfoot Sorry, I thought it was apparently I'm a bird watcher- Hide quoted text - - Show quoted text - Actually, I didn't know you ever went on birdwatching excursions. I just knew you had a bird. Sherry I own a bird (or rather, she owns me) but I have multiple bird feeders on my patio and yes, I go on birdwatching excursions as well. |
#30
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Earthquake this morning!
jmcquown wrote:
wrote: jmcquown wrote: wrote: jmcquown wrote: Reelfoot Lake was formed by a quake here in 1912. It's a BIG lake. Legend has it the ground shook so hard the Mississippi river ran backwards. That sounds very poetic! I wouldn't know about the quake of 1912 Eagles nest at Reelfoot Lake. I totally don't understand this response. scratching head Joyce Um... I wasn't alive in 1912? OK... I certainly didn't think you were alive then. But you did bring it up, after all. Not that it matters, really. I was mostly amused. The stuff about the eagles was baffling to me, but that's OK too. I just thought what you said about the Mississippi running backwards sounded cool. Sounded like the start of a Ray Bradbury story or something - if he wrote about the South rather than the Midwest, that is. Joyce |
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