When somebody sells, someone else is buying. Would this event trigger a price dump or a raise?
Price depends on supply and demand and not on the amount of a sell order.

It's hard to estimate what would happen on all exchanges at once, but we've seen what can happen on a single exchange like on Jan 24 on Bitstamp where around 500 Bitcoin buy made the price go up by 600 USD. If someone had about 50 mln USD to spend they could easily push the price over 40k right now, which would probably start a short liquidation cascade and take us to 45k, maybe even to the 50k resistance zone. Of course if the demand would not follow we'd see a slow bleed back below 40k in the next days or weeks.

To do the opposite you'd probably need 1k bitcoins. That dumped all at once would easily get us below the current low of 33k, but again that would happen on a single exchange. To really crash the price you'd need a simultaneous attack on big exchanges like coinbase and binance and put 2 orders 1k btc each at each of them. But would that be worth it? Probably not because if the demand is there, all you'd achieve is a flash crash and then the price would start to grind back up to 35k.

I don't think you are familiar with the rule that when one profile is banned, you have no right to use another profile. Even though you think you're smart and you've deleted all your posts - nothing has been permanently deleted - https://ninjastic.space/search?author=Patrick2t2&board=1

Sooner or later you will be banned again for plagiarism and word spinning.

I seriously doubt that you can make any good estimate about how much money would you need to make such shift just by looking at order books. Order books can change in an instant based on the current market state. So technically you can change the price by 10% by fulfilling enough orders on either side, but traders will start immediately making and filling new orders, and it's completely unpredictable if it would cause panic and further crash, or if it would be viewed as a "dip" opportunity and the price would quickly rebound.

It's a great question, but I don't think there's a formula because it really depends a lot of how others react. Even if this a big sum, like hundreds of millions of dollars, people can get excited and buy quickly enough for there to not be such an effect on the price. But I think it's easy to estimate the level of event that can cause such a thing, and I believe events are more important than pure buy or sell orders. So it can be a company with valuation of at least 0.5 trillion dollars announcing pulling out a billion of dollars worth of Bitcoin. It can be a couple of days without electricity in a country that's in top-5 by crypto mining. Another option is a country that has a big population and a lot of crypto users considering a draft bill that bans cryptos or crypto mining.

It is an interesting question but very hard to answer because it depends on market conditions.

As you said the "depth of the orderbooks" is an important factor but also there are orders that don't exist in order books, they come into existence when price moves in a certain direction which makes everything so much more complicated. For example you could say it takes $X to dump it 10% but when it dumps 10% there could be a panic and people could remove their orders "thinning" the order books.

But the people's reactions depends on the market conditions. For example we saw this many times in the past, like in 2017, where bear whales tried so hard for weeks to go against the market and dump the price, they lost millions trying to do it and failed even though the order books didn't show that much resistance. It simply was because the trend was bullish and they were going against it.
This happens in the opposite direction in bear markets but way less common.

That's were the demands and supply come's in. The price of cryptocurrencies comes up when the demands is of higher potential than supply, so the demands we are emphasising on trigger the acceleration of cryptocurrency and especially bitcoin, but when the supply is in the stages of higher potential's the market structure goes into shambles, so obviously it began to fluctuating because of surplus, excessive supply, so i believe the of the disadvantages that causes market dump.

Judging from how the question was asked, it doesn’t matter if there is someone who is ready to buy the sell coins or not, the question is whether there will be anyone who can singlehandedly create a Bitcoin crash of at least 10%.

Even if there is someone that would be ready to buy the sold the coins, the market must have gone down that 10% by the time they put that sell order. So that would be a mission accomplished. But the good thing is that there would always be people who are ready to buy it like you have said, and the market would be back on its feet in no long time.

Sell orderbook is what is capable of pulling price down because it may cause fear in every where in exchange but buy order can bring shift up in price for positive sentiment to start out and you can see the price move up. It is the demand that will bring sell, if no demand sell will look hard.

Funny that you mentioned Musk here because he did try to crash the market and failed miserably. All he could do was a small panic sell that led to less than 5% drop which is not categorized as even a big drop let alone a crash (drops bigger than 30% are usually considered as crashes).
That was his first attempt, he tried again and people largely ignored him and price didn't even move