6.0 Quake in Napa California
6.0 Quake in Napa California
(OP)
Here's a couple of links:
News report
Berkley Link
USGS
News report
Berkley Link
USGS
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RE: 6.0 Quake in Napa California
Slide Show
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RE: 6.0 Quake in Napa California
Photos
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RE: 6.0 Quake in Napa California
When we lived there (until 1989) this area was either open land, salt marsh, wine or fields, or suburbs - one family homes 900 sq ft to 1500 sq ft, many single floor. The two and three story building were mostly light commercial (offices ) or government. Napa had one hospital that was higher, Vallejo had two others.
I'm not surprised at some damage => because many, many homes and offices were stucco over block and wood frames, but I am surprised by the amount of "shelf" goods like those photo's that were not better restrained. And, of course, the government building damages. Like the cambered up sidewalks in the slide show in the links above, most will be cosmetic. Expensive cosmetic, but not whole-scaled structural losses.
RE: 6.0 Quake in Napa California
Maine EIT, Civil/Structural.
RE: 6.0 Quake in Napa California
The best figures I have been able to find were on USGS and Cal Berkeley site but that was just the magnitude (6), depth of the center (7 miles), some surface settlements in deposited soil and general location of the center.
I was interested in accelerations (vertical up and down), (horizontal E-W and N-S). I got the Northridge, CA preliminary results reasonably soon but is was about a week or two after the fact and they were not too detailed at that point. Right now, all I found in searching was mention of .5G vertical at some unidentified point. The Northridge dam had a vertical acceleration of about 1.5% downward, which was a little scary.
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.
RE: 6.0 Quake in Napa California
This is of the First Methodist church in Napa, California after the quake.
(I'm now seeing it listed as a 6.1 in the news reports)
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RE: 6.0 Quake in Napa California
RE: 6.0 Quake in Napa California
Check it out - we were thinking, as we watched it, what one of these things cost and if we could use them ourselves when
investigating structures.
https://www.youtube.com/watch?v=LQhYbfIz0n4
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RE: 6.0 Quake in Napa California
Maine EIT, Civil/Structural.
RE: 6.0 Quake in Napa California
Maine EIT, Civil/Structural.
RE: 6.0 Quake in Napa California
Thank you for the original links and the quadcopter video
RE: 6.0 Quake in Napa California
I did an internship at IBM's Almaden Research Centre one summer and I still remember a conversation I had with one of the more senior researchers there. One of his larger vertical racks of computers was unrestrained during the Loma Prieta earthquake (1989) and the only reason it didn't completely fall over and almost injure or kill him was that he had such a tangle of BNC and CAT5 cables coming out the back of it that they somehow held it when it toppled. Of course after that incident everything in his lab was retrofitted with "earthquake brackets".
RE: 6.0 Quake in Napa California
There was a good study on the wine storage racks that was done by an excellent firm in SF. But that doesn't mean than anyone will do their suggestions. Remember speaking with the engineer concerning a winery I was doing in 2001 and my client wasn't interested. (In El
Dorado county).
I'm not surprised about the damage - we have a lot of URM buildings where I live - no one wants to upgrade them and the local building department gets pressured to not enforce the minimum code.
Least no one was killed in this one. An earlier quake killed a couple of women in Paso Robles a number of years ago.
RE: 6.0 Quake in Napa California
http://strongmotioncenter.org/cgi-bin/CESMD/iqrSta...