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Old May 28th, 2015, 06:03 PM   #2241
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Nice pictures guys!! thanks for sharing.
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Old May 28th, 2015, 06:28 PM   #2242
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Originally Posted by 10064 View Post
It's the movies. What do you expect. Remember the movie 10.5 At the end when they were running away from the earth opening up behind them. As if it were chasing them.
The most ridiculous I've seen is that movie "2012". They go from a place that I am not sure if they identify during a Hyper-Mega, Never-ever-seen-magnitude earthquake, they did pass through Downtown Los Angeles, where everything is falling apart, but they still, somehow, manage to get to LAX (how many kilometers away from Downtown is that) in the middle of such a catastrofic event. A trip that I guess could easily take half an hour, without traffic and in standing freeways, they did it in a limo dodging falling debris all the way... Finally leaving the city in a plane as the airport runway is ripping apart behind them and Los Angeles is sinking into the ocean...

Last edited by CCs77; May 28th, 2015 at 06:43 PM.
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Old May 28th, 2015, 07:05 PM   #2243
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Yes, the Northridge event only ruptured the western portion of the San Fernando Valley, but SoCal geologists are actively gathering lots of data that sheds new light on the prospects of compound rupturing.

The entire San Andreas Fault Zone is like web of fractured, woven, broken glass. It's not uniform, and impossibly complex. There are hundreds of faults, both known and not, that may rupture at any time.

NativeOrange would have been more accurate to say that the Puente Hills blind thrust fault could be incorporated in a multi-fault compound rupture that together would release enough energy to produce a M 8.0 event. The fault itself cannot release anywhere near enough energy to achieve that magnitude, but it wouldn't be a stretch if it slipped with several others simultaneously as part of a complex compound rupture.

Oh, and this is not exactly accurate either:


The Moment Magnitude scale is a measurement of the amount of energy released in a seismic event, not the ferocity of the earth's shaking. M 9.0+ megathrust subduction quakes displace an enormous amount of earth, and in so doing can shake in excess of 10 minutes, but no more fiercely than other shallow events. The M 9.5 Valdivia event ruptured several thousand miles along its plate boundary, and is the largest such rupture ever known, but it may surprise you to know that the highest instrumentally recorded peak ground acceleration (the force of shaking, measured in G-force) EVER... occurred in SoCal's own M 6.7 Northridge blind thrust event.

With very few exceptions, most all subduction zones exist offshore, where the subducting plate dives beneath the continental shelf of that overlapping it into the mantle. So the reality is that basically no such boundaries exist near major cities. Because they occur a distance offshore, the true threat of the M 9.0+ megathrust quakes are never the shaking, and always the tsunami caused by the water displaced above the rupture. The tsunamis are always far more devastating than the shaking, especially if they create an oceanwide wave; damages and loss of life reach their peak if the wave hits multiple continental shores, like both the the M 9.1 Sumatra and M 9.2 Alaska quake tsunamis did.

---

I really dislike this tangent though. It is well documented that the Wilshire Grand is built to code, and is going to easily withstand any seismic event the region is going to throw at it. I'm very excited to see this building rising. Let's try not to keep getting distracted by things we've already known for a long time.
The multi-fault situation is what was in the news not to long ago. A situation where the Ventura/ Santa Barbara fault ruptured and spread east to other faults under the SF valley and into San Bernadino creating a wide spread large quake.
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Old May 29th, 2015, 05:54 AM   #2244
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it looks very good
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Old May 29th, 2015, 11:01 AM   #2245
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Puente Hills alone I heard in the past was able to produce up to around 7 magnitude by itself and being right under our feet, it could be a problem. Its all the other tied in faults, and unfortunately the stress is shared amongst a lot of faults. I am actually a little more worried about this fault, and the Newport-Inglewood fault than the San Andreas. The San Andreas will make a really big quake, but its got some distance to travel.

Does anybody here remember Landers in 1992? A 7.4 hit and lasted over a minute and was pretty big, with big long wavelengths. Then later that morning, it triggered a 6.5 in Big Bear. In 1999, we had a 7.1 in Hector Mine that was a good shake, but it was also far out and basically on the same network of faults that is tied in with what created the Landers event in 92.

The problem is that the magnitude does not always tell the whole story. The Northridge quake created the most intense movement (ground acelleration rates) ever measured directly under a large city in modern times. These were movement rates are usually produced by upper magnitude 7 range quakes. The kind of fault and location of rupture are very important. Its always one of these local ones that blindside us about every 20-25 years though, but we are expecting them 100% of the time since it can happen at any minute and you dont get any real warning. In a big quake you are already having to take cover and/or dodge dlying objects within seconds, and it can shake you to the ground. Its not easy to stand or run when its moving very badly.

The San Andreas movie is total bullshit, and can tell just from the few clips from the advertisements. If we ever experience that level of insanity, it would be safe to say that we have hit the apocalypse.

I think almost all 1960's era (and on) will hold up well enough to even a severe quake to where you wont see a complete collapse. Most that do, would hypothetically be partial. The older buildings are obviously the most vulnerable in the area. Most buildings, WG for example, are given a hypothetical rating as far as how strong of a quake it can handle. But does it mean it can handle that given quake with no damage, or with some damage? Usually what they keep in mind with building codes (bare minimum), you are supposed to be able to get out of the building alive. When they rate a lot of these building I dont think that they usually consider the fault rupturing right under, versus a distance away. Something like US Bank tower would probably have little to no damage from an 8 magnitude San Andreas. The WG was directly put under a 7.8 magnitude simulation (striking locally), and they made adjustments to the structure to make it more earthquake resistant and minimize the chance for damage. These buildings have such stout foundations that are drilled to bedrook, so they stay put very well usually even with liquifaction, or crevices that open.
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Old May 29th, 2015, 03:17 PM   #2246
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Is there an aerial render or one from a distance, to judge how it'll affect LA's skyline? Thanks!
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Old May 29th, 2015, 06:37 PM   #2247
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Excellent analysis by all but I don't believe anyone sufficiently answered my question.

If the ground beneath one of these towers is pushed in any direction -- up, down, side-to-side, whatever -- it would likely doom the building wouldn't it?
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Old May 29th, 2015, 06:58 PM   #2248
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Quote:
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Excellent analysis by all but I don't believe anyone sufficiently answered my question.

If the ground beneath one of these towers is pushed in any direction -- up, down, side-to-side, whatever -- it would likely doom the building wouldn't it?
No, I believe the tower will be built with seismic reinforcement and probably a shitload of design fail-safes built into the structure. Any kind of earthquake that would produce enough potential to cause this tower to drop will drop the others as well and the Bay Area would be seriously boned.
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Old May 29th, 2015, 07:00 PM   #2249
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The most ridiculous I've seen is that movie "2012". They go from a place that I am not sure if they identify during a Hyper-Mega, Never-ever-seen-magnitude earthquake, they did pass through Downtown Los Angeles, where everything is falling apart, but they still, somehow, manage to get to LAX (how many kilometers away from Downtown is that) in the middle of such a catastrofic event. A trip that I guess could easily take half an hour, without traffic and in standing freeways, they did it in a limo dodging falling debris all the way... Finally leaving the city in a plane as the airport runway is ripping apart behind them and Los Angeles is sinking into the ocean...

Actually, that was the local news you were watching.
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Old May 29th, 2015, 08:47 PM   #2250
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Quote:
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Excellent analysis by all but I don't believe anyone sufficiently answered my question. If the ground beneath one of these towers is pushed in any direction -- up, down, side-to-side, whatever -- it would likely doom the building wouldn't it?
If you're talking about buildings built directly on top of a fault, yes, a shift of even a few centimeters would compromise the structural integrity of the building. But that's why there are no skyscrapers built directly on fault lines.

Even the regulations that scuttled the Millennium Hollywood project (which include a minimum safe distance from a fault for a building to be constructed) are not about the danger of shaking, which modern buildings are very good at handling, as much as the danger of an uncharted offshoot of the fault shifting and shearing the buildings in two. If that were to happen, the buildings would have to come down.
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Old May 29th, 2015, 10:59 PM   #2251
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Awesome shot by Hunter Kerhart

20150529-DSC02829-2 by Hunter, on Flickr
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Old May 31st, 2015, 11:04 AM   #2252
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October 2013
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Old May 31st, 2015, 02:58 PM   #2253
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Nice!
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Old May 31st, 2015, 07:06 PM   #2254
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The facade looks great!
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Old May 31st, 2015, 08:52 PM   #2255
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Amazing construction speed as well.
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Old June 1st, 2015, 03:58 AM   #2256
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Sunday May 31, 2015

Wilshire Grand by HunterKerhart.com, on Flickr
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Old June 1st, 2015, 03:59 AM   #2257
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Wilshire Grand by HunterKerhart.com, on Flickr
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Old June 1st, 2015, 04:00 AM   #2258
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May 31, 2015

Wilshire Grand by HunterKerhart.com, on Flickr
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Old June 1st, 2015, 04:01 AM   #2259
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Wilshire Grand by HunterKerhart.com, on Flickr
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Old June 2nd, 2015, 09:22 PM   #2260
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commento rimosso

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