Yes so am I

Big fan, keep making these videos!

Yup - shaking looks good here ❤

🇽🇰

Watching an object that big move that quickly certainly sells it on a normal monitor. This is one of your best videos showing scale, both of the shake and of the systems responsible for it.

when he realizes tom is alittle more knowledgable than your average journalist (just a little)

I couldn't understand everything they explained, but I'm glad there's Tom and undoubtedly a big online audience here who appreciates this complexity and the chance to geek out about the challenging scale at which this system operates. It's nice to find videos where such complexity isn't avoided just because it's not understandable for everyone. As someone less technically educated I had my enjoyment watching them being excited about this.

Such a relief to not have science dumbed down. Dumb people don't want to watch science videos anyway.

To be fair it's probably not "stupid journalist" so much as stupid viewers of journalist.

He was probably pleased as punch to be talking about the shake table with someone who actually understood something of the forces involved and could really grasp how COOL his job is.

Demo as in 'demolish', not 'demonstrate', for those like me who just spent 30 seconds trying to figure out how you demo a wall

given the pressure of what's in the pipes, it's presumably less a question of "can't demo that wall" and more "really, _really_ shouldn't demo that wall, please"

​​@@MiseFreisin You could probably drain the network, but it would be really annoying to do it in a controlled way, and it would take ages.

I used to design and build automation systems for oil wells in Nothern Alberta. The pain is real. Even for NEW installations the automation is an afterthought so we were always the last to be called and had to work around anything else that was on site because they NEVER made any allowances for control circuits and instrumentation placement. Let alone coming along later and adding or changing something that was already in place and having to run wire in places where it was never meant to go.

@@TomLuTon and here’s the new wall model, it can block wind, it’s water proof against water pressure as high as a garden hose, it can withstand a human body being thrown at it, and it can easily be painted on without the paint sliding off completely

Also, I finally learned which is which.

Pitch, front up/down Roll, side up/down yaw, front sideways

That building looks more like a rocket than like a plane, so I feel like roll should be about the vertical axis.

Pitch versus roll for something that isn't supposed to travel and is wider than it is long is extra hard. Sure, roll is sides up and down, but are "the sides" your wrist and fingertips or your thumb and pinky when you're talking about the shake table?

The way I remember Roll Pitch and Yaw is that Roll is rotation around the X axis, Pitch around Y and Yaw around Z.

He understands the significance of a u-turn in those pipes.

Not just a u turn (smooth semi circle), but 2 90⁰ turns for each pipe, into the short end of a T no less.

Genuine Physics reaction!

@@mathewng1988 I was more amazed by that T-junction than the U-turn! Weird it wasn’t even mentioned

​@@mathewng1988 I think the reason they did that is because of reliability. If they did two long curves it would be more likely to stress out the metal when making the curves, where the smaller curves would be less to worry about. It's technically less efficient, but it's the best option.

Ye

That is one reason for the popularity of his videos.

You can also see him applying knowledge he picked up from other videos. Like the water hammer effect he likely researched to talk about that lake that is also a battery. It was quite wholesome.

The guy himself also looks very interested in telling how it works and I love it

This is what makes tom scott videos some of the best om youtube, a genuine interest in the videos he is creating

And fantastically complex too, double whammy

We definitely need that level of engineering just due to the size of our state & the fact we get a little bit of every kind of earthquake there is.

If we just want to simulate 1 earthquake it's easy just use explosive, but to make repeated, controlled, and SAFE even after the building tip?, that's what make it need that much of technology

and thats just on the scale of 1 building, not half a country

Earthquakes be like: "Look What They Need To Mimic A Fraction Of Our Power"

While earthquakes can strike anywhere on Earth they are more prevalent in some places than others. So your best bet is to simply stay out of earthquake prone zones. That's worked for me so far.

@@1pcfred same here, though we did have a quake here about 12 years ago. one of the weirdest sensations i've ever felt and i was like 100 miles from the epicenter

@@1pcfred You'd be amazed where they can happen, we can get a three or four pointer here in Scotland once every five years or so. A farmer I know has to go round correcting all of his upturned sheep. No joke.

@@krashd the opposite of cow-tipping, that

Thank you for your work on this project!

You one of the engineers at UC SD there?

@@jamesknapp64 I think he was one of the camera people.

I got to do the filming and drone stuff. But I am also an engineer here (not on the shake table team).

You know that when people ask him what he does for a living he says, "I work in rock & roll."

He was probably enjoying having a member of the public actually _get_ what they were doing.

Yes, I was very impressed by the professor.

I'm a bridge engineer myself and I can attest I would love for someone to ask me about bridge design and actually act interested.

​@@hazonku "I do the shaky baky but with buildings"

The more difficult thing about designing something (from the video) is knowing what “safe” is. It’s interesting that they can’t just go “emergency stop and re-center!” Also the building resonance “force feedback” on the machine is complicated, with each building having its own feedback.

One of the worst rookie mistakes you can make when building *anything* is to create an emergency stop system that just replaces the original problem with a bigger problem.

They probably have a deadline for the amount of test time they can spend per building. I imagine they have a lot of people who need their buildings to be shaken down.

@@jwalster9412 "Shaken down". I see what you did there.

@@jwalster9412 can confirm. They have another test right after this one, and a full year of testing booked after that for other projects.

​@@dan_zehner which company or gov agency runs this facility? Any idea?

@@5th_decile it's a National Science Foundation funded center.

The whole thing is just a big vibe machine

This earthquake pun is so lame it physically shakes me to my core.

Richter

Looks like we found Tom's resonant frequency then.

And in a real earthquake you can't stand, so running isn't an option.

@@Dave-rd6sp You would have trouble standing during one of these too, but no-one is allowed on the platform itself.

@@MartinFinnerup Indeed.

And that's for a relatively small quake. The displacement in the Kobe earthquake was about 1 metre.

Maybe one could try rolling really fast

I think it's less turbulent violence than heat generation (efficiency loss) from all the bends and connections. Hence the large diameter and smooth metal pipe to reduce heat loss as much as possible. Hydraulic oil is incompressible and already has filled all the lines. Just transmitting power from one side to the other. Hydraulics are a 'liquid drive-shaft' not flowing water.

@@The76Malibu hydraulics are 'flowing water', especially one like this setup. Cycling multiple, very large rams very fast will take a huge amount of flow. Just lifting all 6 vertical rams 5" in 2 seconds (not fast for this) would take a flow rate of over 3,100 gal /minute - 11,800L/min.

Agreed ..the U turns are childs play compared to those dead end T joints

Same for when the maglev train whooshed past him.

bit of a backhanded compliment but ok

@@deJessias It's moreso that he's usually very composed and professional in his videos

in the court

@@deJessias What about it is a backhanded compliment?

Would you be my spirit animal?

Same except the drunk part

I'm with you. When you're sober, you don't know if people want to hear cool facts... but when you're drunk, you don't care. :)

third there's one with giant steel ball

​@MiIey Cryus 🅥 what? its miley cryus?

@@ItIsJan And apparently she's vegan 🅥

@@ItIsJan Nah, just another scammer

Probably because he apparently has a superpower to not film natural geological activities so he goes to artificial ones.

What's to understand? When earth god angry make ground shake.

​@@1pcfred Fluid dynamics, resonance frequency,...

@@bene5431 we appease fire god with you.

Who on earth doesn't pick z is up when working in 3d?

@@QuantumHistorian the unity engine, apparently

@@QuantumHistorian Mojang.

@@QuantumHistorianSolidworks.

@@QuantumHistorian depends, is my target a Monitor/painting/billboard? (2d plane in the vertical) or a building/floorplan blueprint? 2d plane on the ground. most 3d models (unity) should be using the 3d blueprint (Z is up) style. Z is always into your eyes. are you observing a wall? or the ground from the sky?

They had a camera guy going around recording it, but he forgot to take the lens cap off…

Hmm, I bet Practical Engineering would be all over that.

The best kind of Tom Scott video - the ones where you go "Now I really want to dig into this"

He's a professor at UC San Diego, so it's good you want to listen to him, as others do!

@@neillthornton1149 he is a professor at the fudge packing academy

Building a shake table in New Zealand is like building a spider farm in Australia.

you"d still do it if you for needed a supply of spiders with predictable characteristics

In the US we have a university club called EERI which builds structures to resist seismic activity. Some schools can get some insane results out of their builds. Often they will partner with concrete canoe teams which build canoes out of concrete which I did for 4 years. Super fun and very challenging to do well, Tom could do a great episode on those competitions.

We test our graphite cores for our nuclear reactors on shake tables. Quite interesting to test scale models of 12m diameter 30m high cores of free standing graphite bricks.

@@illdeletethismusic - indeed, there is actually a *dedicated website* selling stuff for farming spiders in Australia (specifically spiders, specifically Australia)... being a nation that essentially *only* exists at the intersection of two continental plates means we NZers really *really* need to SCIENCE earthquakes, wasn't the one in this video in California? California is not exactly the most tectonically stable place in the world either...

UCSD*

You can visibly see him get happier and more engaging at around 2:25 onwards when he realises Tom actually understands what he is talking about and is showing genuine interest. It's a rare sight with interviews nowadays

It's probably the most important factor!

I was thinking about it when they said it. Because in a real earthquake the amount of energy and mass being moved is sort of irrelevant to the stuff on the surface.

The building can shake back and influence the table. A building can't shake the Earth.

@@dathat555 technically it can and does (Newton's third law) - but not that you'd notice. Certainly not in the middle of an earthquake!

@@paulhaynes8045 would be awkward if an earthquake hits the resonant frequency of Earth and we lose our planet

Mass timber (really, big pieces of engineered wood) is a fascinating building technology: you get to use all the cool wood-jointing methods, but the sizes you can build with are much bigger. And somehow it all stays strong and can even withstand some fire. One of the logos on the banner is the Japanese Sumitomo Forestry, which is planning to build a 70-storey wood skyscraper somewhere in Tokyo.

@@a2e5 I watched a show on multi-story mountain homes built using this method. That was decades ago by the way. It's actually getting hard in the US to find good informative shows like that. Even the specialty channels fall short for me.

The question is: were there earthquakes when he was in japan "recently"? 👀

@@ann18o96 We'll never know, because if there were, they didn't happen.

@@phantonormia3790 As long as we don't check it's schroedingers earthquakes

Nice! I read the stuff on the recent Glulam fire test as well :3

That could be the world's lamest horror game.

Hopefully we've got a good while yet before we ever have to worry about that.

@@tbotalpha8133 isn't this the last year of constant uploads? he will reduce the frequency afterwards

Well...

I've only ever been in one earthquake and it was a quiet slow roller. I still thought I was having a seizure while it was happening. Because I watched the ground come up at me. I was thinking, it's not supposed to look like that. I thought I was having vision problems. But the ground had waves going through it like you'd have on the surface of water. It was rather disconcerting. I like my terra firma.

My thoughts went to the Syria/Turkey earthquake. It's so sad that we know how to construct buildings that can withstand such immense forces, but then some people chose not to to increase their profit margins.

@@Martin-di9pp Thanks for your feeling, Most of the contractors are greedy and there is no authority to monitor them, even if that happens, they have cunning lawyers who take them out of their responsibilities and the poor people bear the fees.

@@Martin-di9pp people do what they can. Not all choices are available to everyone all the time.

​@@ahmad-mureryhuman experience is universal I guess, though this is to a different scale

Building and you both won't exist to make a video later

No, you don't.

Knowing nothing of the subject, are the pressures in refineries comparable? Or way higher?

High pressures in large volumes surely makes a difference?

@@WyattWinters about the same, but MUCH higher volume - albeit only in certain locations. Also, no need for nearly as many safety control systems or overkill engineering since it isn't the entire facility that's pressurized - it's only the compressors where actual refinement is done.

I can imagine. I just noticed that swimming pools did desensitize me against the volume of fluid. These pipes are a bit smaller than those of an olympia pool

@@spdcrzy Also flow rates and pressures in refineries don't oscillate wildly (at least not as part of regular operation).

I wonder if that's by design? Cushion the energy, spread it out over several minutes, rather than taking the full blow at once?

@@Nalehw 100%

I'm curious as to what it looked like to you driving past. Was it just a weird ongoing construction site where they seemed to change what half-built building they had there every few years? Or did you know more than that? :o

@@carlbutcher2268 I thought they were building some military rappelling training thing since it's next to MCAS Miramar. The structure in the video popped up relatively recently.

@@heist3326 How often do you see something shaking on the shake table?

@@scythalI've never seen the building shake before. It's a hundred yards or so from the main road and by the time you get closer to the driveway entrance, there are a ton of trees in the way. It's also just after a government vehicle only driveway access to a part of the base. The gate to the shake table was closed most of the time I drove by commuting, so I always incorrectly assumed it was associated with the military. There's not really a good spot to stop around there. You'd have to park in the neighborhood or across the highway and walk quite a bit to the sidewalk across the street to see the tall structure. I feel like any shaking from that distance would be a challenge to observe.

@@heist3326 “I thought they were building some military rappelling training thing since it's next to MCAS Miramar” I thought the same thing! I lived local to MCAS Miramar when I was in high school, still make my way that way occasionally to visit some friends, or the like. Crazy to think about Tom Scott making it to our neck of the woods, hey?

that's a really short one though! Big earthquakes usually span several minutes, and even minor ones easily surpass the 30 second mark

@@matieyzaguirre And those feel like hours.

The 1964 earthquake in Alaska was a 9.2 and lasted nearly 3 minutes.

You're supposed to secure things with blue tack. Now go out and buy a package. It's cheap enough.

Our research network that UCSD is a part of collaborates closely with E Defense in Japan.

Math is good. But ground is *angry.*

They haven't left themselves with much margin for error. But that's the modern era I suppose. There's no longer a safety factor in anything.

@@1pcfred that's a rough guess. it might be schedule 140 with a max allowed of 4,300 psi. schedule 160 clears 5k. now mind you, that's the max allowed working pressure, not the bursting point of the pipe. My point was that you can order most of that gear from a standard supply house, surprisingly. schedule 140 is so common it's also just called "XXS". schedule 40 is "STD", and 80 is "XS". and yes, it's standard, extra strong, and extra *extra* strong... as for safety margins, there's quite a big strain factor above working limits, much like lifting gear, if you're within spec you're good. You can also have limiting devices and such installed that will bleed pressure over an allowed pressure, so if operating pressure is 3k, something might spike it, so at 3500 psi, it forces a spring open and bleeds volume out of the system instead. it's as simple as a big ball bearing and a really big spring.

@@seldoon_nemar if you have money someone will sell you anything. If they don't have it they'll get it.

*than Should have paid more attention in school.

​@@schmarcel4238lol

@@schmarcel4238 You beat me to it! 😄

You think that was a big one?

@@1pcfred Medium-large. Remember you are at the epicenter. And yes, I have been at a quake epicenter.

@@RZ350NC Cal State Northridge? Landers Big Bear?

@@markmurphy854 CSN campus on the Friday of the three 5+ aftershocks. I was a student photojournalist for the CSULB "Union" newspaper and went there to interview he staff and take some photos. They said I could wander around the campus and take photos, but "Don't go into any buildings". "No problem," I replied. It was one of the few times where the TV news cameras just could not capture the extent of the damage and destruction that I observed.

just for the experience of living with (deep) earthquakes, I would say that's something between a 5.8 and a 6.5 Mw, the kind of thing that feels a bit frightening even if you're accustomed to them.

he didn't said how much, but from what i've seen it looks somewhere between 5-6 Mw which doesn't look like much, but still very scary and devastating.

Yes we are

Anyone that wants to be safe has already moved to Texas.

@@UCSanDiego Wait, this is... this is actually the real UCSD account.

@@vigilantcosmicpenguin8721 It's confirmed - the UCSD really is making yo momma-safe dwellings!

This one was most likely a 6.7, since they've been doing the Northridge earthquake ground motions for public demonstrations with media.

@@dan_zehner Oh, damn, that information really shows how strong that building is.

yesh

Alternatively: "Shake, shake, shake the table Shake the building down!"