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re: Hypothetical if a 7.8 earthquake hit California like it did Turkey how bad
Posted on 2/7/23 at 12:19 pm to WhuckFistle
Posted on 2/7/23 at 12:19 pm to WhuckFistle
Isn't that Galloping Gertie (aka Tacoma Narrows Bridge)?
If so, all that flexing is simply from wind, not even a quake. I think it was only about a 40 mph wind too.
1
Posted on 2/7/23 at 12:25 pm to Tvilletiger
Would be worse if a 7.8 hit the New Madrid fault
Posted on 2/7/23 at 12:26 pm to PJinAtl
quote:
Isn't that Galloping Gertie (aka Tacoma Narrows Bridge)?
If so, all that flexing is simply from wind, not even a quake. I think it was only about a 40 mph wind too.
Absolutely Gertie, and like you said, was caused by resonance in the bridge as a result of heavy winds.
This post was edited on 2/7/23 at 12:27 pm
Posted on 2/7/23 at 12:29 pm to tigeraddict
quote:
6.9
Posted on 2/7/23 at 12:32 pm to jatilen
quote:
Learn to swim, learn to swim, learn to swim
See you down in Arizona Bay.
This post was edited on 2/7/23 at 12:32 pm
Posted on 2/7/23 at 12:36 pm to WhuckFistle
quote:
I'm sure some are aware, even yourself, and understand the gif goes with the theme of the thread, but wasn't that incident caused by faulty engineering/resonance caused by vehicle traffic/ high winds?
Or am I thinking of a different famous cable bridge going crazy?
Posted on 2/7/23 at 12:40 pm to foosball
quote:
would be great if a 17.8 hit directly on Hollywood Blvd
If a 17.8 were possible it would literally shatter the planet.
Posted on 2/7/23 at 12:43 pm to IAmNERD
It was high winds, I just rolled with that gif.
Posted on 2/7/23 at 12:54 pm to Nawlens Gator
quote:
1811 earthquakes were pretty bad
A 7.8 on the New Madrid fault would be too terrible to think about. Imagine most of the rail and road bridges across the Mississippi collapsing, snarling up barge traffic. Heavy casualties due to mostly brick structures from Shreveport to Paducah. With faults, it's always a question of when, not if.
Posted on 2/7/23 at 1:33 pm to Kayakndan74
If an earthquake hits at the border of Arkansas and Tennessee, whose fault is it?
Posted on 2/7/23 at 1:33 pm to Tvilletiger
I believe there would be tremendous infrastructure damage to roads, bridges, underground pipes, etc.
Impacts to single family homes would be widespread but unlikely to cause significant fatalities (except for non-structural issues like falling bookshelves).
Most high-rise building in CA are built following significant earthquake building code advances.
I think the predominate damage would be to low and mid-rise apartments that are 40+ years or older so the location of the event will be very important to the prevalence of those types of buildings. Unreinforced masonry has the biggest risk.
Impacts to single family homes would be widespread but unlikely to cause significant fatalities (except for non-structural issues like falling bookshelves).
Most high-rise building in CA are built following significant earthquake building code advances.
I think the predominate damage would be to low and mid-rise apartments that are 40+ years or older so the location of the event will be very important to the prevalence of those types of buildings. Unreinforced masonry has the biggest risk.
Posted on 2/7/23 at 1:40 pm to Tvilletiger
I'm just waiting for the 1st headline that blames the eathquake in Turkey on climate change.
Posted on 2/7/23 at 1:52 pm to Tigeralum2008
quote:
Northridge had a 6.7 hit. caused $40B in damages
the one that hit turkey is 1000x's stronger
I imagine most cites would not be able to survive that level of destruction
My grand parents left Alaska in 1964 a week before they got hit by a 9.2 quake.
Posted on 2/7/23 at 2:00 pm to thumperpait
quote:
My grand parents left Alaska in 1964 a week before they got hit by a 9.2 quake.
my Uncle's wife and her family were homesteaders in Alaska. She told me she remembers the trees almost touching the ground swinging back and forth in the '64 quake
Posted on 2/7/23 at 2:01 pm to Tvilletiger
A 7.8 would be a good start. But if we could get an 8.5 to hit Los Angeles I would be most pleased.
Posted on 2/7/23 at 2:03 pm to Tvilletiger
quote:
Hypothetical if a 7.8 earthquake hit California
I wish a real one would, not a hypothetical one.
Posted on 2/7/23 at 2:05 pm to Galactic Inquisitor
quote:
quote:
Northridge had a 6.7 hit. caused $40B in damages
the one that hit turkey is 1000x's stronger
Bruh, Richter scale is based on log 10. "1000x's stronger" than a 6.7 would be stronger than 9.7.
The 7.8 in Turkey was about 12.6 times stronger than Northridge at 6.7.
From this LINK
The Richter Scale (more accurately referred to now as the “local magnitude” scale or ML), like all other magnitude scales to follow, is logarithmic, meaning each unit up on the scale equals a 10-fold increase in amplitude–e.g. a 7.0 earthquake is 10 times stronger than a 6.0 earthquake, and 100 times stronger than a 5.0 earthquake.
However, the energy released by a seismic wave is 101.5 (or about 31.6x) the amount of its amplitude, meaning that a 7.0 quake releases 31.6 times more energy than a 6.0 quake, or 1,000 times more energy than a 5.0 quake.
Posted on 2/7/23 at 2:13 pm to Tvilletiger
Large buildings in LA and Frisco can handle a pretty big shake now. There would likely be a few hundred killed with something approaching a 7.7 or 7.8 (or more), because that's a NFA ("not fricking around") quake, but the bigger problem would be restoring services. It would be like a "dry" Katrina.
Posted on 2/7/23 at 2:15 pm to Tvilletiger
Ridgecrest had a pretty big one a few years back. A 7.1, Ridgecrest is in the desert east of Bakersfield. My house in Fresno rocked some and it's probably 100 - 150 miles away. Nothing fell over but you could feel the waves for a good 30 seconds. It's a weird feeling.
At my old job we had a team down in Santiago, staying in a high rise, when they were hit with I think it was an 8.9
The hotel was making a humming sound. My boss who was not a small man was tossed around like a rag doll and he was unable to get on his feet. One of the guys that was down there was passed out drunk and slept through it.
The roads were impassable, overpasses collapsed, fires.. you name it. It was bad.
At my old job we had a team down in Santiago, staying in a high rise, when they were hit with I think it was an 8.9
The hotel was making a humming sound. My boss who was not a small man was tossed around like a rag doll and he was unable to get on his feet. One of the guys that was down there was passed out drunk and slept through it.
The roads were impassable, overpasses collapsed, fires.. you name it. It was bad.
Posted on 2/7/23 at 2:38 pm to Tvilletiger
I'm more curious about when the next big earthquake (8-9+) will hit the PNW. It seems to happen every few hundred years and the last was in 1700, which sent a 16 foot tsunami across the ocean to Japan. I remember the magnitude 6.X quake that hit the Seattle area in ~2001, I was on the 2nd or 3rd floor of the HS and the whole building started shaking and swaying, it was a surreal experience. I can only imagine what an 8 or even 9+ would be like.
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